OBDII Readiness Monitor? (Solved)

  • Some of those functions, or processes, are referred to as OBD II readiness monitors. OBD II readiness monitors are software processes that monitor (Test) critical emissions control systems. These processes (Monitors) are referred to by name of the system (s) that they monitor (Test).

What are the obd2 readiness monitors?

The purpose of readiness monitors is to self-test the car’s emission control systems. The monitors are also known as Emissions Monitors. Like the name indicates, they observe the performance of car’s emission related systems. Cars may perform up to 11 system tests or routines.

How do I check my OBD readiness?

To check if the readiness codes are set, turn the ignition switch to the ON (II) position, without starting the engine. The MIL will come on for 20 seconds. If it then goes off, the readiness monitors are set. If it blinks five times, the readiness monitors are not set.

What does OBD II monitors not ready mean?

A “not ready” result means your vehicle’s computer has not had a chance to check all of the parts of the emissions control system for problems – so it cannot determine if everything is working as designed. Until the vehicle is “ready” to complete the checks, the OBD inspection cannot complete.

What is a readiness monitor?

Vehicles perform up to 11 system tests, depending on year, make and model of the vehicle. These tests are commonly referred to as “readiness monitors.” The readiness monitors identify whether the vehicle’s computer has completed the required “tests” while the vehicle is being driven.

How do I pass OBD II emissions?

Tips & Tricks for Passing an Emissions Test

  1. Warm up your engine.
  2. Make sure your car is up-to-date on routine service.
  3. Fix any known engine-related problems.
  4. Make sure the “Check Engine” light is off.
  5. Bring your vehicle to a smog test location that retests for free.
  6. Make sure the “Check Engine” light is off.

How many readiness monitors do I need?

On average, there are 8-11 monitors that OBDII provides, and all these monitors must be in a ready state in order for a smog test to be completed. If you have changed your car battery, or disconnected power to your car, your readiness monitors can get reset.

How many miles do you have to drive to reset computer?

So why is the light still on? Here’s something you probably don’t know: after clearing the car’s computer you will need to drive for about 50 to 100 miles. As you drive your car the computer will monitor all the sensors and register the results.

How many incomplete monitors are allowed in NJ?

A vehicle of model year 1996-2000 is permitted to have two non-continuous monitors not ready and still pass the readiness portion of the OBD test. A vehicle of model year 2001 or newer is only permitted to have one non- continuous monitor not ready.

Can I pass NJ inspection with check engine light on?

KNOW YOUR DUE DATE New Jersey requires a biennial emissions-only inspection for passenger vehicles. THE WARNING LIGHT SECRET A check engine light that stays on will fail inspection, and could signal serious engine trouble.

What is a drive cycle in Obdii?

The purpose of the drive cycle is to run your vehicle’s onboard diagnostics. This, in turn, allows monitors to operate and detect potential malfunctions of your vehicle’s emission system. The correct drive cycle for your vehicle can vary greatly, depending on the vehicle model and the monitors that need to be reset.

How long do you have to drive to complete a drive cycle?

Preparation for it will take eight hours but, all in all, a basic drive cycle test should take around 30 minutes to complete, with about 20 minutes of actual driving.

What will fail a car inspection in NY?

A vehicle will fail inspection if it has a crack of 11 inches or longer in the area of the windshield cleared by the wipers is not permitted. The inspector will also check if all other windows have safety glass or rigid plastic and are in serviceable condition.

How many incomplete monitors are allowed in PA?

As part of the OBD II emission test you do not need to have all of the monitors ready. For 1996 to 2000 vehicles you are allowed to have two monitors incomplete and it can still pass. For 2001 and newer vehicles you are only allowed to have one monitor incomplete and have the vehicle still pass.

What does 025 mean on a code reader?

P0025 is the OBD-II generic code indicating the Engine Control Module (ECM) has determined that the exhaust variable camshaft timing for bank 2 is more retarded than what the ECM has commanded it be.


The objective of readiness monitors in automobiles is to allow the vehicle’s emission systems to self-test. Readiness monitors are self-check procedures that monitor the functioning of certain vehicle emissions control systems. They are used in the automotive industry. Vehicles are capable of performing up to 11 system tests, which are referred to as readiness monitors. In addition to determining if the car’s computer has passed the requisite tests, readiness monitors also determine whether the automobile is safe to drive.

A significant difference exists in the design of continuous displays vs non-continuous monitors.

The non-continuous monitors, on the other hand, need the fulfillment of specific conditions before a test or set of tests may be completed.

Some monitors demand that the automobile adhere to a specified “driving cycle” regimen before they will function properly.

Some functions are monitored by the onboard diagnostics system (OBD) every time you drive your vehicle, while other functions are only checked under specific driving or operating situations.

Despite the fact that continuous monitors are not included in the (NYVIP2) pass/fail criteria, they do contain the following: Comprehensive Component Monitoring (CCM) is used to detect any serious failures in engine sensors that might result in an increase in emissions.

Fuel System Monitoring is used to identify changes in the fuel mixture that may result in an increase in emissions.

OBD2 Readiness Monitors Explained

Editor’s note: This item was updated in March 2020 to reflect the most recent facts and to ensure accuracy. OBD2 Readiness Monitors are self-check procedures that are both easy and effective. They send information to the car’s self-diagnostics system and help it to function more efficiently. This post will go into further depth about what the readiness monitors are and how they work. Designed to self-test the vehicle’s pollution control systems, readiness monitors are installed in vehicles. The monitors are often referred to as Emissions Monitoring Systems.

Vehicles are capable of performing up to 11 system tests or routines. These checks are referred to as “readiness monitors.” The output of readiness monitors tells you whether or not the computer in the automobile has successfully finished the tests.

Readiness Monitor types

Continuous readiness monitors and non-continuous readiness monitors are the two types of readiness monitors available. Continuous monitors are designed in a different way than non-continuous monitors are. While the engine is running, the continuous monitors are being examined and assessed on a continuous basis. Before a test may be conducted on the non-continuous monitors, certain requirements must be satisfied. The circumstances required to perform the non-continuous self-diagnostic tests differ from one another.

Some engines require two driving cycles due to the necessity for cooling and warming up intervals in between each cycle.

The OBD2 standard (SAE J1979) formerly classified each designated monitor as either one of two categories.

As a result, OBD Auto Doctor does not adhere to the classification system any more.

Continuous or Non-continuous Monitors

There are two types of monitors that may be used here. It is entirely up to the manufacturer to make this decision.

Non-Continuous Monitors

Non-continuous monitoring for spark ignition automobiles (with gasoline engines) and compression ignition cars (with diesel engines) are different (diesel engines).

Spark ignition vehicles (Gas)
  • Engine components include a catalytic converter (CAT), a heated catalyst, an evaporative air purification system (EVAP), a secondary air purification system, an oxygen sensor (O2), an oxygen sensor heater, an EGR (exhaust gas recirculation) and/or a variable valve timing system (VVT).
Compression ignition vehicles (Diesel)

  • Exhaust Gas Sensor, PM Filter, EGR and/or VVT System, NMHC Catalyst, NOx/SCR Aftertreatment, Boost Pressure,

Using Windows, OBD readiness monitors may be read.

Monitoring cycles

Since the diagnostic issue codes had been removed, the only monitor status that was displayed was the current state. All OBD2 compliant cars are required to have this readiness monitor status displayed. It will display the long-term condition of the vehicle once the check engine light has been reset and the DTCs have been cleared. As the OBD2 standard has matured, newer cars may now communicate the status of their emission monitors for the present driving cycle as well. Every time the monitoring cycle begins, these monitors begin from the beginning of the previous cycle.

In that situation, OBD Auto Doctor will indicate that it is NA, which stands for Not Available.

Monitor status

The outcome of the readiness monitor test reveals the state of the monitor. Each readiness monitor will have a unique output status that will be shown. The completion state can be any of the following:

  • The term “completeor ready” refers to the fact that the exam has been completed. It indicates that the OBD-II system has examined and found the emissions control system to be functional, and that it has passed the test. This is shown by a green check mark on the OBD Auto Doctor
  • Incomplete or not ready indicates that the test has not been finished. It indicates that the OBD2 system was either unable to conduct this procedure or that the routine had failed. This is shown by a red exclamation point on the OBD Auto Doctor screen. Deactivated indicates that the test has been disabled for the remainder of the current monitoring period. When there is no simple way for the driver to operate the vehicle in order to allow the monitor to work, the monitor might be deactivated. For example, the temperature of the surrounding air may be either too low or too high.

OBD Auto Doctor displays a list of all the monitors that have been defined in the software. However, the real status may only be given for the ones that the automobile is also capable of supporting. It is not necessary for an automobile to be able to accommodate all of the monitors. The term NA, which stands for not available monitor, indicates that the automobile does not have that monitor. As a result, it cannot be tested. With the Android app, you can keep track of your reading readiness. For this driving cycle, the vehicle does not support the use of readiness monitors.

Why is a monitor incomplete or “not ready”

It is also possible to reset the monitor statuses by clearing the diagnostic trouble codes (DTCs) and the Check Engine Light. This generally occurs during or immediately following a car repair job. In the event of a power breakdown, the statuses are also reset. This frequently occurs after the battery has been removed from the system. As a result, it is not recommended that the battery be disconnected. If you need to disconnect the battery, for example, to replace it, continue reading this section of the guide.

When a new monitoring cycle is initiated, the state of the current monitoring cycle, also known as “this driving cycle,” is set to unfinished.

Your OBDII car may not pass the yearly inspection unless the relevant monitors have been replaced or reset, depending on your nation and state of residence.

For example, the Environmental Protection Agency rules in the United States allow up to two monitors to be unfit for use in automobiles from the model years 1996 to 2000. Only a single monitor status might be incomplete or not ready for vehicles manufactured in 2001 and later model years.

How to get the monitors complete or “ready”?

Because the monitors have self-check procedures, driving the automobile is the most efficient method of getting them ready. However, monotonic driving will almost certainly fail to achieve all of the required requirements. That is why there is something known as an OBD drive cycle. Let’s start with the obvious ones first, and then move on to more complicated ones.

  1. To begin, check certain that the MIL (Malfunction Indicator Light) is not turned on by mistake. It is possible that having saved or even pending diagnostic problem codes activated would prohibit a monitor from doing its job. In the second place, make sure you have adequate petrol in your automobile. Some monitors, such as the EVAP monitor, may need that the fuel level be between 35 percent and 85 percent before the diagnostic testing may be performed
  2. However, this is not always the case. Third, finish what is known as the “drive cycle.” Typically, one week of combined city and highway driving is sufficient to get the monitors up to full operational level. Detailed explanation of the driving cycle is provided in the next paragraph

OBD drive cycle

On-board diagnostics (OBD2) are enabled via the OBD2 drive cycle, which allows your automobile to do diagnostics while driving. As a result, the readiness monitors are able to function properly. Additionally, it may identify probable problems in your vehicle’s emission system. The proper driving cycle for your automobile might differ significantly depending on the type and manufacturer of your vehicle. Aside from that, the monitor in question has an impact on the number of drive cycles necessary.

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Typically, a few days of typical driving, both in the city and on the highway, will be sufficient to prepare the monitors.

It will aid in the resetting of monitors when a car-specific drive cycle is not available for a particular vehicle.

Under regular driving situations, it might be difficult to keep track of the drive cycle in its entirety.

  1. The universal OBD-II driving cycle begins with a cold start, which is followed by a warm up. The coolant temperature should be less than 50 degrees Celsius/122 degrees Fahrenheit, and the coolant and air temperatures should be within 11 degrees of one another. To accomplish this state, let the vehicle to sit overnight
  2. The ignition key must not be left in the ON position before performing a cold start on the next day. Otherwise, the heated oxygen sensor diagnostic may not be able to be performed. Start the engine and let it idle in drive for two and a half minutes, with the A/C and rear defroster turned on if they are fitted
  3. Turn off the air conditioning and rear defroster, and accelerate to a top speed of 90 km/h (55 mph) while maintaining a modest and consistent acceleration. Maintain a constant pace for three minutes. Without braking, reduce your speed to 30 km/h (20 mph). If you are driving a manual transmission vehicle, do not push the clutch pedal. Return to a speed of 90-100 km/h (55-60 mph) while using 3/4 of the throttle. Maintain a constant pace for five minutes
  4. Gradually slow down to a complete halt without braking

Get ready for inspection

You may prepare your automobile for the yearly inspection yourself, which will help you prevent having your car rejected. At the very least, you should check the readiness monitors to see whether they are operational. This will prevent you from receiving nearly certain rejection. Check for any diagnostic issue codes that may be present as well. All of this is possible with the help of the OBD Auto Doctor diagnostic software. Even with the free version, you can see the current condition of your monitors as well as the diagnostic issue codes.

Remember, you should not wait until the yearly inspection to address the problems.

Check OBD II Monitor Readiness Without A Scan Tool

Many late-model cars may be checked for OBD II monitor readiness without the use of a scan tool, according to the manufacturer. This is frequently required in order to establish whether or not your vehicle is ready for its California smog inspection.

What is OBD II monitor readiness?

The on-board diagnostic system (OBDII) in cars built after 1996 may execute up to eleven diagnostic tests on the vehicle’s pollution control systems. These checks are carried out in the background while the driver is engaged in regular driving and are not intended to impair the vehicle’s performance or safety. A failure is recognized by the power train control module (PCM – The computer), which displays the malfunction indication light (MIL – Check Engine – Service Vehicle Soon) to alert the driver.

In the vast majority of circumstances, a vehicle with insufficient readiness monitors will fail the California smog inspection (SeeNew Readiness Monitor Standards For OBD II Functional Inspection).

The majority of OBD II monitors should be completed by driving the car under situations that fulfill the monitor activating requirements. This is normally completed after driving fifty to one hundred miles in normal traffic conditions.

How to check monitors without a scan tool

The owner’s handbook for your car will most likely detail the proper technique in most circumstances. Consult your vehicle’s owner’s handbook for information relevant to your vehicle’s model. The following processes, on the other hand, are provided as examples. It’s possible that they won’t apply to your unique car.

Ford/Lincoln/Mercury Vehicles

To evaluate whether or not OBD II monitors are fully functional, do the following tests:

  1. Turn the ignition key to the “on” position and hold it there for 15 seconds without starting the car. It means one or more readiness monitors are not fully functional if the “Service Engine Soon” indicator blinks eight times in succession. If the service engine soon indication remains solid, this indicates that all readiness monitoring have been completed.

This process was included in the Owner’s Manual for a 2012 Ford Focus, and it is described in detail. This approach may also be used to other Ford/Lincoln/Mercury car types and model year variations.

For Jeep, Chrysler and Dodge

According to the owner’s handbook, the car has a simple ignition key activated test that you may do prior to taking it to the test station for inspection. To determine whether or not your vehicle’s OBD II system is operational, you must do the following tests:

  1. Start by flipping the ignition switch to the “ON” position, but do not crank the engine or start it. If you crank the engine or start it, you will have to start over from the beginning of this test. Once the ignition switch is turned to the ON position, the MIL (Check Engine Light) sign will illuminate as part of a routine bulb check
  2. This is normal. One of the following two things will occur around 15 seconds later:
  1. The MIL will flash for about 10 seconds before returning to its fully lit state until the ignition is turned off or the engine is started again. This indicates that your vehicle’s OBD II system is not operational, and you should refrain from proceeding to the smog check station. The MIL will not flash at all and will remain completely lighted until the ignition is turned off or the engine is started. This indicates that the OBD II system in your car is operational, and you can go to the smog check station.

Without starting the engine, flip the ignition switch to the ON (II) position to see if the readiness codes have been programmed correctly. The MIL will be activated for a total of 20 seconds. If it then goes off, it means that the readiness monitors have been activated. If it blinks five times, this indicates that the readiness monitors are not configured.

What Do You Mean My Car’s Not Ready?

Vehicles equipped with On Board Diagnostic II (OBDII), which includes most gasoline-powered vehicles manufactured in 1996 or later and most diesel-powered vehicles manufactured in 1997 or later and with a gross vehicle weight rating (GVWR) of less than 8,501 pounds, can self-test their emission systems using a variety of monitoring devices. Depending on the year, make, and model of the vehicle, vehicles can undertake up to 11 system checks. These assessments are referred to as “readiness monitors” in the industry.

Upon successful completion of a testing procedure, the system status will be declared as “ready.” A test that has not been finished will be marked as “not ready.” It is not possible to pass the yearly inspection of an OBDII car unless the needed monitors are “ready.” When the test equipment generates a Vehicle Inspection Report, it will identify monitors that are not ready for use.

The vehicle inspector is unable to alter the information provided by the vehicle during the inspection.

How Many Monitors Have to be Ready?

Model year 1996 through 2000 cars may have up to two monitors in a “not ready” condition, with one monitor in a “not ready” state for model year 2001 or subsequent vehicles, according to Environmental Protection Agency (EPA) rules.

What Causes a “Not-Ready” Report?

The following are the reasons for a “not ready” report:

  • Recent car repairs in which diagnostic trouble codes have been cleared using an OBDII scan tool
  • Or, if the battery has been recently removed or changed
  • Or, if the vehicle’s computer requires a software update
  • Or, if a potential fault has not yet flashed the “check engine” light
  • Or

What Do I Do Now?

It will be necessary to drive your car in a certain manner known as a “drive cycle” in order to allow your vehicle’s monitors to run their checks and return them to a “ready” state once they have been reset. Running through the driving cycle prepares the readiness monitors so that they are ready to identify any emissions issues as soon as they occur.

The particular driving cycle for your car might vary depending on the vehicle’s make and model, as well as which monitors need to be reset. It is common to require two driving cycles, separated by a cool down interval, in most situations.

What Are My Options?

You will be granted a 10-day extension to lawfully operate your car on public roads if the only reason your vehicle failed the inspection was due to readiness monitors not being in a “ready” status, and your current inspection has already expired. During those 10 days, you have the option of doing one of the following:

  1. To complete a car or monitor a specific drive cycle, follow the directions in your owner’s handbook (search under OBD), or speak with a skilled auto technician who can tell you how to complete the vehicle or monitor the specific drive cycle. Please make a point of returning to the inspection station within ten days to have the vehicle re-inspected. Discuss the possibility of having a technician do the driving cycles in accordance with manufacturer specific instructions for a charge that you will pay with the inspection station.

You may be charged an emission re-inspection fee by the inspection station operator if you remove the vehicle from the inspection facility and execute the drive cycle on your own. The re-inspection price cannot exceed the maximum amount permitted for an original emission inspection.

How Do I Avoid This in the Future?

Consider the following suggestions:

  1. The moment your vehicle’s check engine light illuminates, do not delay getting it serviced until your next scheduled annual inspection! As well as contributing to air quality, it might save you a lot of time and money in the long run by reducing repair and fuel expenses. Check your owner’s handbook to verify if your vehicle is equipped with a readiness monitor check. Some newer model vehicles have this feature pre-programmed, which allows you to check the monitors in your vehicle before taking it in for an inspection. Inspect your car as soon as possible! Do not put off getting your yearly inspection till the end of the month
  2. Instead, schedule it now.

Generic Drive Cycle

A vehicle’s onboard diagnostics are activated during the OBDII driving cycle, which is designed to do this. Monitors are able to work and identify any flaws in your vehicle’s emission control system as a result of this. When it comes to the right driving cycle for your car, it might vary substantially based on the model of the vehicle and the monitors that need to be reset. When a specific drive cycle is not known, or when drive cycle information is not accessible from an owner’s handbook, the generic drive cycle outlined below may be useful in resetting your vehicle’s monitors and other electronic components.

IMPORTANT: In order to utilize the typical driving cycle provided below, you must adhere to all traffic regulations and drive in a safe way at all times.

  1. Starting with a cold start (coolant temperature below 122 degrees F and the coolant and air temperature sensors within 11 degrees of each other), the OBDII driving cycle progresses to the next step. Prior to a cold start, the ignition key must not be left in the ignition
  2. Otherwise, the heated oxygen sensor diagnostic may not be able to operate.
  • As soon as the engine is started, put the vehicle in drive and let it idle for two and a half minutes with the air conditioning (A/C) and rear defrost turned on, if provided. Turn off the air conditioning and rear defroster, then accelerate to 55 mph using a gentle and consistent acceleration technique. Maintain a constant pace of 55 miles per hour for three minutes
  • Reduce speed to 20 mph without braking (or depressing the clutch in manual gearboxes)
  • Accelerate once more to between 55 and 60 mph
  • During the next five minutes, maintain a constant pace of 55-60 mph. To come to a complete stop without braking, decelerate (coast down).

Additional information may be found at Inspection Requirements. DEPARTMENT OF MOTOR VEHICLES, STATE OF NEW YORK The Honorable Mark J. F. Schroeder, CommissionerC-114 (07/27) Edited for the internet on June 14th, 2014. Return to the DMV Publications page.

Monitor Readiness Concerns

Modern automobiles run a variety of self-tests (Monitors) to check that the OBDII and emission control systems are in correct working condition, among other things. It is common for vehicles to fail a smog inspection due to faults with their Monitor Readiness system. It is important to note that a vehicle may fail the smog check for Monitor Readiness even if the MIL or Check Engine light is not on and there are no clear signs of a problem. A complete analysis and repair must be undertaken on many cars that have failed the test despite having been driven hundreds of miles after failing the test to determine the cause of the failure.

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Important: After a repair such as disconnecting a vehicle’s battery or replacing an emissions component that was found to be problematic, the Readiness Monitors must be re-run.

Except in rare cases, the vast majority of cars will operate all of the Monitors if the vehicle has been properly assessed and repaired, according to the manufacturer.

It was on May 4, 2015, that the Bureau of Automotive Research adopted OBD readiness monitor requirements for both the BAR-97 and the BAR-OIS inspection systems.

A vehicle will not pass a smog check if it is:

  • Gas-powered models from 1996 to 1999 were equipped with more than one incomplete monitor. Gas-powered and hybrid vehicles built after 2000 with more than the evaporative system monitor are considered incomplete. Diesel-powered vehicles from 1998 to 2006 with any monitor missing or broken, or vehicles from 2007 and newer with more than two displays missing or broken


  • Visit the OBD Reference website for additional information on the OBDII Monitor Readiness Standards. General information about the Referee program may be found at the following link: Referee Program.

Don’t Be Deceived – OBD Readiness Monitors Status · BlueStar Inspections

The majority of automotive owners have had their check engine light illuminate at some point in their driving careers. The check engine light (also known as the malfunction indication light (MIL) or the service engine soon (SES) light) illuminates when the vehicle’s engine is malfunctioning. It is critical to understand why automobiles have a check engine light, what the light might potentially imply, and why the light shines when the vehicle is in motion. The Environmental Protection Agency (EPA) emissions regulations must be met by all automobile manufacturers selling new automobiles or sport utility vehicles in the United States, including imports.

  • The circumstances that must be met in order for the check engine light to illuminate are defined by these restrictions.
  • One of the primary purposes of a check engine light is to alert the driver that anything in the vehicle’s emissions control system has degraded to the point that it has fallen below the pre-determined minimum performance limit in one or more of the systems being monitored.
  • When the check engine light illuminates, the engine may perform poorly, but it may also have no effect on the way the engine performs.
  • An professional automotive mechanic should be consulted at this time to determine the nature of the problem.
  • Various types of readiness monitors are available, including continuous and noncontinuous models, that execute self-check procedures while also monitoring the functioning of certain vehicle emissions control systems.
  • It is necessary for non-continuous monitors to be in proper working order in order for the monitor to execute its testing sequence.
  • Vehicles are capable of performing up to 11 various system checks, which are referred to as readiness monitors.

In order for a vehicle to pass state mandated emissions or smog tests, all of the vehicle’s equipped readiness monitors must be in the “ready” or “complete” state, the check engine light bulb must be working properly, the check engine light must not be illuminated, and communication must be established at the OBD connection port.

For a variety of reasons, if you are purchasing a secondhand automobile, the condition of the OBD readiness monitors is crucial to consider.

Temporarily disabling the check engine light and marking all of the readiness monitors as ‘incomplete’ will result in the check engine light being turned off.

The presence of a “not ready” or “incomplete” readiness monitor alerts a potential buyer to a variety of issues, including problems with the system in question, an erased computer memory, recent repairs that may have caused the memory to be erased, or the vehicle’s battery may have recently gone dead.

Don’t be fooled by appearances. Check to see if the car you’re contemplating has the readiness monitors set to’ready’ or ‘complete’ before purchasing. This will prevent you from receiving potentially costly surprises within a few days or weeks after purchasing your automobile.

OBD 2 Drive Cycle Chart to Enable OBD II Monitors

Drive cycles differ from one manufacturer to the next. If emissions are more than 1.5 times the legal limit, the OBDII system generates a fault code and flashes the check engine light on the dashboard. When the power to the engine control module is withdrawn, the OBDII monitors are rendered inoperative and unable to monitor vehicle emissions. To configure the OBD II system monitors, drive the vehicle through the suggested cycle. There are a variety of various OBDII readiness monitors on the market.

When specific requirements are met, the monitor will indicate that it is “ready.” During a cold start, for example, the system checks the heated oxygen sensors.

In the diagram above, you can see some of the monitors and actions that are involved.

OBDII Readiness Monitors

  • Catalyst Monitor, EGR System Monitor, Fuel System Monitor, Misfire Monitor, Oxygen System Monitor, Secondary Air Monitor are all examples of monitoring devices.

While the vehicle is at rest, the system monitors and may even test various systems, such as the evaporative emissions system. Manufacturers also provide driving cycles that may be used to configure specialized monitors, such as the catalyst monitor, which measures the efficiency of catalytic converters.

Emissions Tech: OBDII Readiness Monitors

A scan tool is used by an ASE-certified technician. In the context of an OBDII system, readiness monitors refer to particular programing that is meant to execute different self-checks for emissions compliance. More information is available by clicking here. This means that the vehicle is in conformity with federal and state emissions regulations if these monitors are successfully operated and passed by them. Before these monitors can begin doing their self-check of the vehicle, they must first meet a set of requirements.

  • Setting up readiness monitors may be a time-consuming and aggravating process, to say the least.
  • Enabling requirements are the circumstances that must be satisfied before a monitor will be able to function properly.
  • Consider the enabling requirements as the “prerequisites” that must be met before the PCM will enable the monitor to operate.
  • Not only can they differ from one manufacturer to the next, but they may also be very specific, even down to the engine codes of similar-looking cars!
  • Always double-check your service information to ensure that you have a comprehensive list of the enabling criteria for the individual automobile you’re working on.
  • When a drive cycle is defined, it refers to the exact method the vehicle must be driven in order to satisfy the monitor.
  • Because of the intricacy of the drive cycle, a client may be instructed to “drive the automobile for a number of days” after the repair has been finished in order for the drive cycle to be successfully completed.
  • Check your service information once more to ensure that the vehicle’s precise driving cycle is listed.
  • I am a professor of advanced diagnostics at a local university.
  • These conditions are referred to as “enabling criteria,” and they must be completed in order for a resister to be able to perform sophisticated diagnostics.
  • They will need to finish their “driving cycle” for my course before I will be able to examine the outcomes and assign a final grade.

I appreciate that when it comes to automobiles, enabling criteria and drive cycles aren’t the most exciting topics to discuss, but always remember that the devil is in the details. The information you gain from this sort of resource can help you become a more comprehensive and effective technician.

Toyota Drive Cycle OBDII Readiness Monitors

Toyota offers a variety of OBD2 readiness monitors for emissions testing, and by completing a Toyota Drive cycle, you may activate and prepare the Toyota ODBII sensors for use in the emissions testing process. As long as the smog technician instructs you on which exact drive cycle to conduct, you may concentrate solely on activating that particular drive cycle. Otherwise, you must put each of the many sorts of monitors through its paces. You should not be required to complete all 11 processes; only those that are particular to your model should be completed.

  1. Oxygen Sensor Monitor (Front and Rear O2S Systems)
  2. Oxygen/AF Sensor Monitor (Front and Rear O2S Systems)
  3. Oxygen/AF Sensor Heater Monitor
  4. EGR Monitor (All Except 1FZ–FE Engine)
  5. Catalyst Monitor (O2S Type)
  6. Catalyst Monitor (AF Sensor Type)
  7. EVAP Monitor (Internal Pressure Monitor/Non–Intrusive Type)
  8. EVAP Monitor (Without Leak Detection

More information may be found in Toyota’s 1996-2002 Readiness Monitor Guide.

Toyota Drive Pattern 1 – EGR Monitor

Whether you’re a technician or just curious in what’s going on beneath the hood of your car, understanding the fundamental drive cycle is essential for understanding repairs and emissions testing. In most cases, it is beneficial when doing a car diagnostic test on your own using anOBD2 Scanner.

What is the Drive Cycle?

In the end, and without getting too far into the weeds, a simple driving cycle can let you or your technician determine how effective recent repairs have been and what — if anything — needs to be reevaluated. It is a fundamental cycle that assists your vehicle’s computer (Powertrain Control Module) in doing self-diagnosis and updating the check engine light codes, also known as OBD2 Codes.

How do you do a Drive Cycle?

Driving a bike is straightforward, but it does require some preparation and effort to execute successfully. Moreover, it might differ depending on the brand, model, and year of the vehicle, so be sure to consult your owner’s handbook for extra information and specifications. These, on the other hand, are the ten general phases involved in conducting a basic drive cycle: 1. Using your OBD2 Scanner, clear all OBD II error codes from your vehicle. The drive cycle will not be able to commence until this step has been successfully performed.

  1. 3.
  2. If you wish to complete a true driving cycle, you will not be able to start your car by jumping it.
  3. Allow your car to rest for an eight-hour period.
  4. 5.
  5. 6.
  6. 7.
  7. At each stop sign or stoplight, come to a complete and gradual halt.
  8. 8.
  9. Turn on the cruise control and keep the vehicle moving for at least five miles.

At the bottom of the ramp, you may depress the brake pedal. 3. Return to your house or to your mechanic and repeat step number seven if necessary. When you arrive, put your vehicle in park and allow it to idle for one to two minutes before starting it.

Perform an OBDIIScan

You or your technician may now do an OBD II scan on your car to assess whether or not it has been fixed and is ready to pass an emissions inspection. It’s also utilized after you’ve cleaned the code to figure out what the problem could be and what remedy will be the most beneficial. Maintain the perspective that an essential driving cycle should be representative of a regular person’s commute. In this case, the computer in your engine will perform a series of checks to ensure that everything is running as it should.

How Long does it Take to Complete a Drive Cycle

Although the preparation time will be eight hours, a simple drive cycle test should take no more than 30 minutes to complete, with around 20 minutes of real driving time. Understanding the general health of your car will assist you in ensuring that it drives smoothly and lasts as long as possible. Monitor your dashboard notifications and schedule frequent checks whenever feasible – it will be well worth your effort and money in the long run.

What if a New OBD2 Code Comes Up?

If you go back on the road and drive for a set number of miles, the check engine light will illuminate again if a new OBD2 code is detected. Do not fear, we are here to make sure you are all properly equipped for whatever may lie ahead. Smart Car Health Monitor from nonda is capable of monitoring the health of your vehicle and reading any OBD2 codes. In conjunction with the ZUS app, you may receive thorough diagnoses of your codes, as well as a dedicated short film that teaches you how to correct them at home before you finish another drive cycle of your vehicle.

Recommendation: Start Your DIY Diagnostics FREE

The automobile diagnostic test might be performed at home with the help of an OBD2 Scanner. Read on for additional information on how to do a simple do-it-yourself auto diagnostic test, as well as about the Car Code Reader from nonda, which comes with aFREE gadget and FREE APP!

Toyota Drive Cycle OBDII Readiness Monitors

Toyota offers a variety of OBD2 readiness monitors for emissions testing, and by completing a Toyota Drive cycle, you may activate and prepare the Toyota ODBII sensors for use in the emissions testing process. As long as the smog technician instructs you on which exact drive cycle to conduct, you may concentrate solely on activating that particular drive cycle. Otherwise, you must put each of the many sorts of monitors through its paces. You should not be required to complete all 11 processes; only those that are particular to your model should be completed.

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2 – EGR Monitoring System Type O2S Catalyst Monitor Toyota Drive Pattern 3 – Catalyst Monitor Toyota Drive is a vehicle that is powered by Toyota.

Toyota Drive is a vehicle that is powered by Toyota.

Toyota Drive Pattern 6 – EVAP Monitor – Vacuum Pressure Monitor – Intrusive EVAP Monitoring System Toyota Drive Pattern 7 – Evaporative Emissions Monitor – No Leak Detection Toyota Drive Pattern 8 – EVAP Monitor – Prius – Toyota Motor Corporation Vehicles equipped with Toyota Drive Pattern 9 – Oxygen Sensor Monitor – Front and Rear O2S Systems Driving Pattern 10 – O2S System and Front AF Sensor – Toyota Drive Pattern 10 – Oxygen, Air, and Fuel Ratio Sensor Monitor Oxygen – AF Sensor Heater Monitor is Toyota’s Drive Pattern 11 (Oxygen).

Amazon.com: ScanTool 4301 Ready-or-Not Scan Tool/Emissions Readiness Monitor : Automotive

The Ready-or-Not (RoN) is a scan tool and emissions test instrument that may be used together. Like the OBDLink line of scan tools, RoN is a fully complete PC-based scan tool that can read and clear problem codes as well as show sensor data, exactly like the OBDLink series. The RoN emissions test tool operates independently of a computer, allowing it to swiftly identify whether or not a vehicle’s monitoring systems are configured and ready for emissions testing. There is no need for a computer since audible and visual indicators will alert you when your vehicle is ready for emissions testing after a ‘check engine’ repair has been performed.

  1. When the engine ECU runs a series of tests to assess whether or not different emissions-related systems are functioning properly, this is referred to as monitoring.
  2. Most jurisdictions will not allow a vehicle to be tested for emissions until the engine ECU has passed the vast majority of the tests required.
  3. The RoN system includes visual and aural confirmations that notify the driver when the vehicle is ready to be subjected to environmental testing.
  4. By notifying when a vehicle is ready for emissions testing, it saves both time and irritation for the driver.
  5. RoN may be used to confirm that the engine ECU has finished the bulk of the monitoring it is responsible for.

Using Emissions Drive Cycles to Verify Repairs

Just now, you’ve completed the process of clearing diagnostic trouble codes (DTCs), turning off the malfunction indication light (MIL), and concluding what you hope was a successful diagnostic repair. The following step will indicate whether or not the repair was effective. For the majority of technicians, the right next step is to put the vehicle through its paces to ensure that the repair was successful. The issue is, how are you planning on putting the car through its paces? What are your plans if the MIL doesn’t turn back on?

  1. When the Inspection and Maintenance (I M) readiness monitors are complete, would you do a complete generic OBD II driving cycle?
  2. What is the significance of this?
  3. The manner in which you road-test a car will ultimately determine whether or not the repair was effective.
  4. A well executed road test will assure success while also revealing any underlying flaws that may have been concealed by the first fault.
  5. However, for the benefit of those with less expertise, let us go through the basics.
  6. An OBD II drive cycle is a collection of driving circumstances that are meant to enable the OBD II readiness monitors that are supported.
  7. The PCM’s primary function is to determine whether or not the emissions-related components are functioning properly.

In an ideal world, this would take place in a fair amount of time and distance, but as we all know, the reality is not an ideal world.

The purpose is to ensure that the vehicle will meet emissions regulations under a range of operating scenarios, including city driving.

Driving Schedule for an IM240 Inspection and Maintenance Inspection is illustrated in the chart below.

In this scenario, the test is completed in 4 minutes, and the speed variance is simpler to keep up with over time.

Figure 2 is a screen grab of a typical OBD II I M readiness test screen.

As the vehicle is put through its paces on the road, the PCM runs a series of system checks and changes the monitor status to Complete.

DTCs are established after all tests are completed and the PCM is pleased with the results; in some circumstances, more testing is necessary before a DTC may be set.

I’m not concerned about completing the I M readiness monitoring; the client will notify me if the MIL is turned back on again.

If the MIL illuminates for the same fault code more than once, it means that you either misdiagnosed the problem or that there were many problems and you only corrected one of them.

It’s possible that you rectified the vacuum leak but failed to notice the torn intake air boot.

But what happens if, after the initial repair is completed, another system fails?

Is it more likely that you will be able to sell more diagnostic time or that you will lose money on this repair?

Let’s take a look at the three road test situations that we discussed before in this article.

There’s nothing wrong with a brief road test if you have a reliable means of confirming that the problem with the car was caused by the component you repaired in the first place.

Mode $06 data was utilized in my article “Advanced Mode $06 Diagnostics,” which appeared in the March 2007 edition of Motor, to validate a catalyst repair in little over 80 seconds using Mode $06 data.

The MIL came back on at the first two shops for the same DTC, but not on the first road test.

The third shop performed a proper diagnosis of the car, replaced the catalytic converter, and utilized Mode $06 to check that the repair had been completed successfully.

To read the rest of the article, click here.

Following the repair, the second road-test option was to complete an OBD II drive cycle to ensure that everything was working properly.

The disadvantage is that it may take a long time, or that you may not be able to finish the driving cycle owing to severe weather conditions, which can be frustrating.

You’ve just finished the repair and successfully cleared the code.

What do you think your options are?

Alternatively, the client can have the OBD II drive cycle performed for them, which will verify that the repair was successful and complete the readiness monitoring.

According to Motor’s OBD II Drive Cycle Guide (the MIL must be turned off), the following is the procedure to be followed: Step 1: Connect a scan tool to the monitor and examine the status and precondition of the monitor.

Start the engine and let it run for at least 2 minutes before turning it off.

Step 4: Bring the car to a complete stop and let the engine idle for at least 40 seconds.

Step 6: Check the status of the monitor; it should have changed to Complete.

Step 7: If the monitor does not show that the process is complete, turn off the ignition and repeat Steps 2 through 5 until it does.

In order to validate the DTC, do a second driving cycle.

It is unlikely that you would be satisfied with this method if you are working on a flat rate with limited diagnostic time.

The final conclusion is that you must conduct further study into the driving cycle as part of your repair suggestions.

Perform a driving cycle while the gas gauge is either on Empty or Full, for example, makes no sense.

If you find that the customer requires the readiness monitors to be completed following the repair and that it will take you 30 to 40 minutes to do the road test, you should suggest that the repair be completed over a longer period of time.

Another purpose to finish the OBD II driving cycle is to capture any DTCs that may have been buried previously.

Figure 4 on page 40 is an excerpt from the 2005 Ford OBD System Operation Summary for Gasoline Engines, which can be seen on the Ford website.

Take a look at the Sensors OK line, for starters.

What would be the procedure?

After you’ve cleared the code, you’ll want to put the car through its paces.

The majority of emissions-related DTCs require at least two drive cycle failures before they may be cleared.

If you chose to reconnect the scan tool and run a check for any outstanding DTCs, you may come across this information.

In most cases, the car will be returned to the client within a day or two and the MIL will be turned back on.

Understanding the DTC enabling circumstances is crucial to conducting a correct drive cycle once a repair has been completed successfully.

It is necessary that the following requirements are satisfied in order for the test to be successful: In the Short Term There must be no more than 70 percent of the fuel trim range remaining and no more than 130 percent remaining, and the vehicle must be traveling between 30 and 60 miles per hour, which means the test cannot be conducted at idle in the service bay.

It is highly likely that you will be able to correctly test the Bank 1 O2 sensor and verify that it has been repaired if you road-test the car under these circumstances.

The time required to complete this driving cycle would be less than one minute if the engine had attained operational temperature and had entered closed-loop operation.

This test can be performed by the PCM just once during the driving cycle.

Remember that the second driving cycle will not be completed until the ignition is turned off.

It is possible that you will not want to clear the trouble codes if you are in an OBD II emissions testing location and the client is required to do the state-mandated test straight away.

It may be too hot in Arizona during the summer or too cold in Alaska during the winter to properly do a complete OBD II driving cycle, for example.

This will not be true for all automobiles, so do your homework before making a decision.

However, most of the time, you will not have the luxury of doing so.

It was about 4 inches thick when it was initially released, and it contained the OBD II Drive Cycle Guide.

The number of drive cycles is unknown to me, although I would assume that it is considerably in excess of a thousand.

Figure 5 on page 40 depicts an example of a driving cycle that appears to operate extremely well for the vast majority of Chrysler cars tested.

What shortcuts or programs exist that allow you to automatically reset readiness monitors with a single click of a button?

How would you know whether the PCM was satisfied with the repair if you merely pushed the readiness monitors to perform their tasks?

Basic settings mode is provided by Volkswagen, and it walks you through a number of in-bay operations in order to complete the needed driving cycle tests.

Chrysler offers one of the most user-friendly ways for preparing for the readiness monitor.


The needed things are provided with a low and high range for easy identification and selection.

The first four things on the top screen are within range, but the RPM Range is marked with an arrow, which indicates that the engine is running at too low a speed.

Following that, you can see that all of the enabling conditions have been satisfied and that the test is now in process.

Following this approach will guarantee that the vehicle has been fixed and tested to the highest possible standard.


The EGR temperature (EGRT) is 66.2°F on the left-hand screen, EGR is directed to be turned off, and the monitor is marked as Incomplete.

The third screen displays that the EGRT has continued to rise, and that the EGR monitor has reached its maximum capacity.

Even with a generic OBD II scan tool, it will be tough to get by in this day and age.

If not, you should.

A permanent DTC can only be cleared by the PCM; you will not be able to clear this code with a scan tool or by disconnecting the power supply.

In this instance, the MIL is turned back on immediately after a vehicle passes the needed test.

Again, this is only intended to be used for informational purposes at this time, but it is possible that this will become part of the regulatory framework in the future.

At the end of the day, your aim is to fix autos correctly the first time. Drive cycle testing is intended to assist you in validating your repair, but it will only be effective if it is carried out correctly. Obtain a PDF version of this document.

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