EFI Fuse blows – Toyota?

1s but typically the EFI fuse supplies the EFI Main relay, which in turn powers the fuel pump, ignition switch, and starter relay. In addition it powers the ECM. If any of the sensors or associated wiring feeding data to the ECM is shorted it will also blow the EFI fuse.

Can a short cause a blown fuse?

Your car has a short circuit. A short in the electrical system will just cause a fuse to blow, rather than the wiring overheating or melting. A short is just a poor connection between two conductors that supply electricity, causing an electrical overload in the circuit.

What does AM2 fuse mean?

AM2 fuse is for the ignition switch – which in turn powers the Ignition coil and EFI main relay and Injectors.

What happens when car fuse blows?

Usually, a blown fuse just causes a minor car electrical problem, like backup lights or interior lights not working, not being able to use your radio, losing a turn signal, or some of your climate control features not functioning properly. In rare cases, though, a blown fuse can mean that your car won’t start.

What would cause a fuse to keep blowing in a car?

You have a short The three causes from the most common to the least common are: An electrical device has failed. If a wiper motor or power lock solenoid have fried and melted on the inside, it might start drawing too much power in an attempt to keep working. This overloads the circuit causing a short and a blown fuse.

What is the EFI fuse for?

EFI fuse powers your circuit opening relay,fuelpump and sender,O2 sensors, IAC valve,MAF meter, VSV for EGR, VSV for EVAP, VSV for pressure sensor, ECM, and Point side of the EFI relay.

What is AM1 fuse Toyota?

The AM1 is one of the primary fuses that feed a lot of others, it’s going to be hard to figure out. The starter is not on it. With some research I found that the AM1 fuse is in a circuit with the starter, ignition switch and accessory. I looked at the starter first because it was the last repair.

What is an EFI relay?

Relay. PURPOSE. The EFI relay is a heavy duty electronic switch that requires very little voltage to switch on at the same time It may connect a moderate amperage circuit without the switch wearing out. It is also designed to disconnect if overloaded.

Can a blown fuse drain car battery?

a fuse blows to keep current from going through the circuit. in other words, there’s no way a blown fuse can drain the battery. take the battery in to get checked, it might just be a bad battery.

Why does my fuse keep popping?

A short circuit happens when a hot, or active, electrical wire and a neutral wire touch, causing a large amount of current to flow and overload the circuit. A short circuit should always cause a breaker to trip or a fuse to blow and may also cause sparks, popping sounds and possibly some smoke.

what will cause EFI fuse to blow everytime it’s.

I have no idea where to begin looking right now. Greetings, Enola Gaia. Thank you very much for your assistance. I am going to remove the dash because I believe the problem is behind it. My piggybacks are connected to the main ecm power a/f sensor, the crank, cam, maf, and main ignitor signals. Either there is a short to ground in there or my fuel pump is drawing excessive amps. In this diagram, I have everything that is off the efi fuse flowing, but I don’t know how to isolate individual circuits, for example how to rule out the maf as not being the problem, then rule out the a/f sensor, and so on.

I tried to disconnect the brake light switch and crank it with a 30 amp fuse, but it ran out of 20 amps before I could even crank it, and now it won’t even start at all.

Not wanting to risk blowing the fuse and melting the circuit, I’ll give it another shot in the morning.

Another $5 in fuses, damn those things are becoming expensive: eyecrazy: If the fuse is blown, I can tell because the check engine light will not illuminate when the key is turned on and the vehicle is turned off.

This is the primary power b+ for the ecm, it’s white and red, and it’s on the farthest ecm connector to the right, if that’s exactly next to the brake signal, I think I got it nailed.

Mahloa bra da ahloa bra da ahloa bra da

EFI fuse blows randomly.

Several electronic fuel injection (EFI) components are protected by that fuse, and any one of them can cause the fuse to blow. My guess is that the fuel pump has to be changed, since it consumes the most current and will continue to use more current as it gets older. An additional factor that can cause it is a short to ground in the wiring, which is a very unusual occurrence.

  1. Fuel Pump, IAC valve, EGR valve, Vapor Pressure Sensor, Evap Solenoid, and ECM are all included.

Answered on June 25, 2018 at 0:59 p.m. MoabMoab, 92516 silver badges, 31 bronze badges, and 7 gold badges

  • Thank you for your assistance. Would it be preferable to use a fuse with a greater amp rating? Is there a method to determine whether or not the fuel pump is drawing more current? It has a total of 250k miles on it. I guess I’ll just have to wait for the fuse to blow and then figure things out. 26th of June, 2018 at 3:06 p.m. Is it possible that unplugging the battery may cause anything to reset with the current that the old fuel pump draws? Thanks At 3:19 p.m. on June 26, 2018, “Would it be preferable to use a fuse with a greater amp rating?” “Does unplugging the battery reset anything with the current the old fuel pump draws?” is a bad idea since the fuse protects the wiring and by using a larger fuse you run the chance of breaking the wire. No. at 12:23 a.m. on June 26, 2018
  • Hmm, I simply find it quite strange that unplugging the battery is the only method to prevent the fuse from blowing continuously. It appears like something has to be reset in the system in order for things to return to normal. On June 26th, 2018, at 13:30 p.m. In any case, the fuse broke yesterday and is still blazing today. A battery separation does nothing to alleviate the situation. If the fuse keeps bursting, I’m going to unplug the fuel pump and see if it goes away. @ 13:55 on June 27th, 2018
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There was a problem with the oxygen sensors at some point. It would blow at random intervals because the ECU was attempting to read them and the short caused the fuse to explode. I unplugged them, and the car was back in working order. answered At 15:55 on August 5, 2018, emmanvazzemmanvazz1251 gold badges2 silver badges7 bronze badges1 emmanvazzemmanvazz1251 gold badges2 silver badges7 bronze badges1 emmanvazzemmanvazz1251 gold badges2 silver badges7 bronze badges1

  • It sounds like there is a problem with the wire harness. The wiring harness for the injectors is the same as the wiring harness for the oxygen sensor. There was a short in the harness of our van. Have you noticed a decrease in your gas mileage? At 19:46 on October 4, 2018,

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  • Date of joining: January 28, 2019 Member:280939 Messages:111 Gender:Male I have a 1999 Toyota 4Runner that blew the EFI fuse yesterday and will immediately burst a new fuse once the key is removed from the ignition switch. The fuse will be blown when the relay is reconnected if I unplug the relay and then replace it with a fuse. Any recommendations on where to begin my search would be greatly appreciated. Please accept my thanks in advance.

Wyoming09Well-Known Member

  • Date of joining: April 24, 2015 Member:153833 Messages:14,313 Gender:Male Tripoli, Pa. (New Tripoli, Pa.) Vehicle:2000 Work vehicle with 5 speeds and 4×4 capability. Super Springs Begin by putting the relay through its paces. The Circuit Opening Relay, as well as the gasoline pump circuit, are likewise powered by this circuit. Remove the circuit opening relay to check for a short in the fuel pump circuit, as well as both O2 sensors, if necessary. It is fairly normal for the harness to rub through or even melt during use. I would put money on that, but who knows. If the vehicle’s Check Engine light was illuminated, and if any codes were retrieved,

Blue TruckWell-Known Member

  • Date of joining: January 28, 2019 Member:280939 Messages:111 Gender:Male Yesterday evening, I turned the relay to the low position and, lo and behold, the fuse stayed in place. I let the car idle for about 10 minutes before taking it for a test drive. After about half a mile, the fuse blew again, and I had to pull it back home with a chain and start over. It worked on every relay I tried, and they were all identical. I was confident that I had it figured out and that the relay was the issue. It appears to be something that is constantly hot because the fuse does not need to be turned on in order for it to blow. While I can see the circuit-opening relay in the wiring schematic, I’m not sure where it’s supposed to go. If that relay is pulled and the fuse remains in place, would that suggest a problem with the fuel pump circuit? Everything along the O2 wire appears to be in excellent condition, however it does disappear in a couple spots that I cannot see but can feel and everything appears to be in good condition. I suppose I could check for continuity between the pins of the ECM and the connection plugs? The scan tool is not able to connect. As a result of the ECM being without power, there were no CELs available when I should have done it yesterday.

Wyoming09Well-Known Member

  • Date of joining: April 24, 2015 Member:153833 Messages:14,313 Gender:Male Tripoli, Pa. (New Tripoli, Pa.) Vehicle:2000 Work vehicle with 5 speeds and 4×4 capability. Super Springs Is there a loose connection in the fuse block or anywhere else that is causing it to arc and drain an excessive amount of current? In the case of a 1998 4Runner, the Circuit Opening Relay should be located below the fuse block on the left side of the engine compartment.

Blue TruckWell-Known Member

  • Date of joining: January 28, 2019 Member:280939 Messages:111 Gender:Male Is there a place where I can acquire a pin-out diagram?

hemitrukOld man, young boi truk

  • Date of joining: October 17, 2009 Member:24461 Messages:2,125 Gender:Male KurtHawaii is his given name. Automobile: 2010 Dodge Dbl Cab Sport a few examples It is necessary to determine what additional circuits are powered by that one fuse and proceed from there. Mitchell, I believe, provides online wiring diagrams that you may subscribe to on a monthly basis. Also, I found a Toyotafactory wiring schematic for a 2005 Rav4 on onebay, so you might want to look there as well

Blue TruckWell-Known Member

  • Date of joining: January 28, 2019 Member:280939 Messages:111 Gender:Male The fact that I cannot locate a layout of the ECM connector to know which wire is which based on color is a major PIA
  • I have wiring schematics and even joined up for a 2-day techinfo account
  • And

hemitrukOld man, young boi truk

  • Date of joining: October 17, 2009 Member:24461 Messages:2,125 Gender:Male KurtHawaii is his given name. Automobile: 2010 Dodge Dbl Cab Sport a few examples Look at which circuits are powered by that single fuse. Each circuit and its associated wires should be depicted on the diagram. The car I was working on had a gauge fuse that was supplied by around n6 distinct circuits.

Blue TruckWell-Known Member

  • Date of joining: January 28, 2019 Member:280939 Messages:111 Gender:Male I’ve discovered that the power cable for the front O2 sensor is the source of the problem, but there is no obvious damage to the wire in question. This circuit has seven separate sensors that are connected together. I have located all of the wires that come out of the splice point, but because they are all the same color (as per the wiring schematic) and get electricity from the same location, I need to determine which of the seven wires is connected to the front oxygen sensor. I believe that if I use a powered test light connected to the O2 sensor connector, the electricity will flow back through all seven wires of the sensor. Is that what you’re saying? Because the problem is intermittent and I was able to isolate the wire when it was grounding out, I have dug into the splice and wiggled some wires but have not been able to reproduce the problem. I do not want to send the vehicle out on the road and leave whoever is driving it stranded, so I am not sending it out. Maybe I’m a complete moron! Is there anything I’m overlooking in my troubleshooting?
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hemitrukOld man, young boi truk

  • Date of joining: October 17, 2009 Member:24461 Messages:2,125 Gender:Male KurtHawaii is his given name. Automobile: 2010 Dodge Dbl Cab Sport Only 5volts are present at the sensor in a fewThink. I really don’t want to turn on the electricity to the cables. It has the potential to destroy a computer. If you are certain that one of the seven wires coming from the slice is the culprit, you might try cutting wires from the splice until you locate a short. If, after disconnecting all of the wires, the short continues, you know you were on the wrong road. I purchased a circuit breaker that replaces fuses so that I would not have to change fuses on a regular basis. Alternatively, a short finder can be used. Has a circuit breaker that you may connect to when replacing a blown fuse

Blue TruckWell-Known Member

  1. Date of joining: January 28, 2019 Member:280939 Messages:111 Gender:Male I ended up cutting them one at a time until I found the right one, which was probably not the best method, but I’m confident I found the right one, spliced in new wire, and drove an hour to work today. It did throw P1135, despite the fact that the sensor was only a year old and was a cheap one, and it also threw P0125, which had appeared previously. Attempting to replace the thermostat to see if it resolves the issue

EFI fuse blowing?

This discussion has 0 members and 1 guest currently viewing it. A friend’s 91 p/u 22re is blowing the EFI fuse, and he wants to know what to do. Basically, you may ignite it and it will go around 100 feet before exploding. He has gone over every inch of the property. He is not a very skilled mechanic, and I wish I was closer because I have been attempting to identify the problem over the phone with him, and I wish I was closer. In this case, what are the top 10 items to look for that might be a contributing factor?

After there, it’s on to all of the injectors, sensors, and other components. What are your thoughts, everyone? The events of the day began all at the same time. There were no issues, until on the way home, it went off! Logged

Check the o2 sensor wires for continuity! In fact, I experienced the exact same situation when I had my 89! It was simply a wire that had fallen onto the exhaust pipe and was causing a short circuit. I had to pop the efi fuse approximately three times before I finally discovered it. I experienced the similar issue, except it turned out to be the gasoline pump in my vehicle. I discovered that even though I had 4WD engaged on my 1986 4runner SAS 36s and other components, my hubs are not automatically locking?

  1. What exactly does the term “manual” mean?
  2. So I went out and bought some cool autolocking hubs, which I then installed.
  3. On the O/2 sensor wire, there is an X2.
  4. Logged WD-40 and DUCT TAPE are the only tools you’ll ever need in your life.
  5. THE DUCT TAPE MUST BE USED IF THE IT SHOULDN’T MOVE BUT DOES.
  6. BeccaLoo24 I have the ability to toss grown men.
  7. Everything was going OK until I began to accelerate upwards and the engine stopped out without warning and wouldn’t restart.

– MichaelLogged in to add a comment It happened to X3 a number of times!

wife’s daily 2010 Chevy Tahoe LT5.3L V8, 6in Lift, 35s, and AMP power steps Work/Business Truck, Ford F250 XLT, 2016, 6.2L V8 engine taytershubby13 is on Instagram.

so, one of us is going to have to go talk to them about it and see what they say.

Sometimes the fuse would only last a minute, and other times it would last a week.

That has been the case ever since.

About 4 years ago, I spent a long period chasing the identical issue down and down.

As I was driving home from a lengthy night shift, I eventually became enraged and strung up a couple of male disconnects on a short piece of wire to vent my frustration.

Since then, things have remained the same as they were. If you have full hydro, an automatic and 44’s, what could possibly go wrong? Logged

About four years ago, I spent a long period chasing the same issue. The fuse would sometimes just last a minute, and other times it would last a week. After a lengthy graveyard shift, I was finally enraged and drove home, where I attached a pair of male disconnects to a small piece of wire. It has been that way ever since. If you have full hydro, an auto and 44’s, what could possibly go wrong? That’s all there is to it. Check all of the wires to make sure they haven’t been damaged or shorted.

  1. Ford F250 XLT Work/Business Truck (2016 model) V8 engine with 6.2L displacement taytershubby13 is on Instagram.
  2. The cat caused the o2 wires to become melted and grounded on the exhaust.
  3. or wherever the pavement stops, the wise man is more interested in listening and observing than he is in speaking.
  4. (twistedtoy92) Another vote in favor of the wire for the oxygen sensor.
  5. It was just intermittent.
  6. Logged R151F Hybrid, Dual Ultimate, Triple sticks, 35s, 5.29s, HP front, V6 rear, Aussies, 63″ Chevs, Warn 8274 on Home Built Bumper, 88 Pickup SAS’d.
  7. I recall one of my 22rs having one down near the transmission as well, might it be the one grounding, or do they even have one on a 22re?

I remember one of my 22rs having one down near the transmission as well, could it be the one that is grounding or do they even have one on a 22re?

Logged WD-40 and DUCT TAPE are the only tools you’ll ever need in your life.

THE DUCT TAPE MUST BE USED IF THE IT SHOULDN’T MOVE BUT DOES.

BeccaLoo24 I have the ability to throw grown guys.

(If you still have a cat, that is) Logged

it was the o2 on mine also. thanks everyoneLogged


Help – 15A EFI Fuse blows upon starting engine!

  1. Down near the cat, there is where you will find me. For those of you who still have a cat, Logged

NS, EFI fuse blows and would appreciate any information

  • Date of joining: December 26, 2019 Member:40343 Messages:10 Gender:Male 3″ leveling kit for 2008 Toyota Tundra crewmax limited 5.7 4WD It is a 2008 Toyota Tundra 4WD CrewMax Limited 5.7LW/Navi’Factory’ RES (remote engine start) that is being offered! Help I recently experienced a breakdown on the highway while traveling at 65 mph due to what appeared to be an electrical problem, and the vehicle fully shut down. Immediate after turning off the vehicle while in 2wd mode, the 4lo, 4hi, VSC and traction lights all emerged and began flashing simultaneously. (There is no CEL.) Needless to say, I had to call for a tow truck to take me back to my house. I discovered that the EFI fuse had blown and replaced it before attempting to start the truck. Before I could even turn the key to the RUN position, it started up in the ACC position with the starter engaged. Even after turning the key to the Out position, the starter continued to engage, resulting in the battery connections being pulled off. So, after some consideration, I believe I have limited it down to the PCM or ECU, as well as the key ignition relay or switch, or the remote start system. But, honestly, I’m stumped! Do you have any thoughts?
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ForceV4Pull my finger

  • Date of joining: September 8, 2018 Member:19162 Messages:170 Gender:MaleSacramento Vehicle:2018 Dodge Dakota TRD 4×4 My old Toyota pickup, which was built in 1992, had a similar problem with the starter stuck. It was discovered that the problem was caused by worn contacts within the starter. They were quickly and readily changed, and the problem was resolved. At the time, the blown EFI fuse did not present a problem for me. Even though it would be a remarkable coincidence for you to be experiencing two unrelated difficulties at the same time, strange things do happen
  • I would first pull the starting relay and then switch on the ignition to see what occurs. If it does not turn, I would remove the relay and reinstall it to see what would happen. The starter should be pursued if this does not reduce the field down any more. You should be aware that changing the starter on an engine with a 5.7L engine is not an easy task since the starter is buried on the inside of the exhaust manifold and needs many hours of labor merely to get it out. There are other threads that cover it in detail with images, but just to give you a heads up

SWITCHESNew Member

  • Date of joining: December 26, 2019 Member:40343 Messages:10 Gender:Male 3″ leveling kit for 2008 Toyota Tundra crewmax limited 5.7 4WD Well, I’m now able to report back, and here’s what I’ve discovered thus far. When I was installing the cold air intake, there was an additional element that I mistook for a splash guard because it hooked into the front fender (I guess). I’m not sure what it is but unknown to me it slipped down and rested on the wire harness, and I assume that after a period of vibrating it shorted out two wires: 1-WB (ground) and 1- 12g Blue. That was the source of my EFI fuse problem, which has been resolved with no further blown fuses. So now the only issue is that when I turn the key to the “ON” position, the starter will engage until the starter fuse is pulled, regardless of whether the key is in the “ON” position or not. A mechanic buddy has been assisting me, and following last night’s events, he has concluded that the ECM is faulty. The following dashboard lights are illuminated: 4lo (flash), CEL, and slip indicator (flashsteady on). Please know that any and all feedback is much appreciated.

NewImprovedRonHey!Get off my grass!

  1. Date of joining:July 8, 2015 Member:1501 Messages:13,500 Gender:Male Ron’s first name is Ron and he lives in Bentonville, Arkansas. Vehicle: 2015 TSS Doublecab 4X4 Off Road in Radiant Red TRD Rear Sway Bars, BedRug bed mats and tailgate mat, Morimoto Fog Lights, Diamondback SE Bed Cover, LED bed lights, and more will be added in the future. Deck rail system, bed divider and door sill protectors, LED reverse light bars, Aries Bull Bar with 28″ 180 watt LED light bar, LED step lights, LED bed lights, driver-side grab handle, LED reverse light bars, LED step lights, LED bed lights. It’s possible that @Ruggybuggy has some comments on this
  2. These are the kinds of things I’d check into. 1) The Relay that starts the process. Ignition Switch (Push Button) 3) Look for any further shorted wires. The most recent revision was made on July 19, 2020. It’s not a simple process on a Tundra, and it’s possible that the ECM has been shorted out. Do you have any idea what circuit the blue wire was connected to? There’s no way I’d be distracted by the starter. It appears to be a sign of a more serious problem. Even if your starter isn’t working, you may check for spark. You should give the starter some starting fluid if you have a spark
  3. I would assume that if you turned the key to the off position, the starter would switch off as well. It should enable you to crank, crank, crank until it starts up, but when you put the key off, the starter should be turned off. There might be two issues with it. The fuel pump does not turn on, and the starter is constantly on. Starter fluid may be the solution to all of your troubles.

Blowing efi fuse NEED HELP PLEASE!

There must be a short circuit between the EFI 1 relay and the fuel injectors, based on the logic of the situation. The EFI 1 relay as well as the fuse are located in the engine bay fuse box. From the fuse box to the injectors, this cable is responsible for power. Make that there are no exposed wires, cracked or damaged insulation, shorts to earth, or other wires on the cables leading from the injectors back to the fuse box. It’s possible that the short is located directly at the injectors’ terminals.

Concentrate on those cables, and you will discover the source of the problem.

I’m now working on a 2000 Celica for a buddy of mine.

To cut a long tale short, we had to tow it back home and have been racking our brains ever since.

1 7.5 amp fuse explodes the second the ignition is turned on.

Can somebody please assist me in providing some direction as to where to look? This has been going on for quite some time with no success.

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