Question about 1991 Toyota Pickup

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Unsure if promblem is fixed. Blowing efi fuse.

Blowing efi fuse. put in jumper wire to look for spark in wiring harness. no luck. put in another fuse didnt blow. problem solved, truck runs fine no other fuses blown??? What does ect power stand for? Button in cab just ahead of the shifting lever on the floor activates it. Dash indicator comes on ect power. Whats it for??

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  • blucoondawg May 19, 2009

    1993 Toyota pickup 4x4 extended cab efi fuse is blowing cant find a bare wire, new sending unit. Now fuse blows as soon as I turn key on



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The most common reason for the EFI fuse to blow is the wiring is rubbed through somewhere in the engine wiring harness, this fuse supplies power to many EFI parts on the engine, always look for shorts where the most movement is, the engine is that place, most likely the next time you go down a really rough road the short may occure again, carry a few fuses just to be safe.

Posted on Sep 15, 2008


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Won't start new motor

Is it carved or efi??If efi do this::locate your throttle body,pull the air intake hose loose from the throttle body,spray starting fluid or carb cleaner into the throttle body opening, push the hose back onto the throttle body then try to start the car.If it starts & runs for a few seconds then dies,you've got a No Fuel problem.If it doesn't start at all,you've got a No Spark problem.If its a no fuel issue,turn the key on & listen for the fuel pump priming sound.If you don't hear it,check for a blown fuel pump fuse,defective fuel pump relay,a defective computer power relay or a tripped inertia switch.If they're OK,disconnect the harness at the fuel pump,turn the key on and use a voltmeter to test for battery voltage.If voltage is present,the pump is bad.If voltage isn't present,but its present at the fuel pump relay harness, there's most likely a short/open in the wiring harness between the FP relay & pump.You didn't list your vehicle info,so I'm unsure of which type ignition you've got.
Most no starts on a new engine are caused by a ground wire you forgot to connect,wiring harness not plugged in or a timing issue.

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1 Answer

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the EFI will NOT inject if it sees no spark.!!! by DESIGN.
all EFI does that. Gasoline. engines.
so fix spark. 1st. IT'S BAD so... this works on all cars. gas.
ok, so its 95 toy corolla, no engine size stated.or country
  1. fuses good.
  2. CEL lamp glows key on, if not EFI will be dead. see #1
  3. this car has CHeck jumper "diagnostic jumper"
  4. insert the jumper ,per page on that. lost it?
  5. crank engine for 5 seconds.
  6. release key, do NOT turn off,yet.
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  9. on new cars we use a scan tool .to do the same thing.
  10. if no errors, then the Highvoltage side is bad, COIL or the ignitor.
  11. Most PCM's can report dead ignitor.

the ignitor is driven by the PCM/ECU and monitored at all times
scan it. and win.

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1 Answer

92 Toyota pickup, was blowing efi fuse now its not but when I turn the key it doesn't do anything

A bad short blowing the fuse. Could be in the wiring for that circuit, or bad part, component (like the computer, sometimes a shorted injector).
Check if the fuse still has power to it. Use a test light to check for power at the fuse. If no power, probably blew a fusible link or maxi fuse that is the feed for that fuse block.
Turn key to on-do the warning lights and dash gauges come on? If not, check that power is still getting to the ignition switch. I think there are fuses (AM1 &2?) for the ignition switch, not fusible links.
Shorts in the wiring can be difficult to find, may be buried deep in a wiring harness, one needs to check continuity of wiring to locate wiring shorts, looking for high resistance in a section of wire-you may need a shop to diagnose. If you have a wiring diagram available, could start checking wiring and parts in that circuit.
If you want to get creative, here is how an auto electrician can hunt for shorts: use some jumper wires and hook up a circuit breaker of same rating as the efi fuse in that fuse slot. Now when testing you will not be constantly blowing the fuse-circuit breaker will reset every time. Unhook parts in the circuit one at a time, turn key on so power is going through the circuit, whatever part is unplugged that breaker does not trip, that is the problem-the wiring to it or the part itself. Also do a wiggle test of the wiring: key on, move different parts of the wiring and harness, if you cause the short tripping the breaker (or blowing the fuse if you just keep adding a new fuse each time) then you have found the short.
Here's a heads up: anytime you want to pull the connectors off of the computer, make sure key is off, remove negative battery terminal, pull connectors off the computer, reattach the negative battery terminal. With connectors off examine connector pins for any corrosion or bent pins.
Good luck, get power back to the ignition switch if it is lost, then start looking for what is blowing the efi fuse.

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1 Answer

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A power wire is shorted out. When you turn on the switch, it sends power to the wire, which is grounding out, and popping the fuse. My guess would be a wire got hot and melted the insulation off and it's shorting out on you. Good Luck. in your steering trace wires

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check wiring harness for injectors,and the injectors Short to ground in harness or shorted injector. common problem with injectors are shorts to ground.

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I would check the fuel pump relay under the dash in the passenger side and check the efi relay first. After that i would follow the wires to the fuel pump and the engine harness for any shorts.

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1 Answer

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Check the fuel pump relay, i am not sure but i think there are two of them. Check the wire harness too, mice may have chewed in to the wires causing a shot in the system. 
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May 09, 2009 | Chevrolet Prizm Cars & Trucks

1 Answer

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This is caused by a damaged wire on the engine going to the different parts that are controlled by the EFI computer, look for places the harness may have rubbed through the wire insulation, it will be hard to find, but it will be there somewhere.

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3 Answers

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