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Will not start no injector Pulse

Tiny
BATOSAI69
  • MEMBER
  • TOYOTA 4RUNNER
I have a 1990 4 runner 22re, was running fine then developed a nasty oil leak but still ran good. Parked it that same day and it sat during the winter months. Went out to move it and it would not start. Found that it had no injector pulse, I have checked all the fuses and related relays I can find and everything else seems okay. I was able to pull a TPS related code earlier from it. When I went out this evening to verify which code it was the computer would not give me anything. I'm running out of options since there is no sense in rebuilding the engine until I figure out why it won't start now. I was trying to make a new computer my last option but that's where I seem to be at now. Any help would be greatly appreciated. Thanks in advance
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Wednesday, July 25th, 2007 AT 10:26 PM

15 Replies

Tiny
RASMATAZ
  • MECHANIC
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Check the power resistor that's the one that powers it, then the ECM grounds it through circuits 10/20.
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Thursday, July 26th, 2007 AT 5:02 PM
Tiny
BATOSAI69
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Could you be a little more specific as to where this is located as the manual is more or less useless? Thanks
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Thursday, July 26th, 2007 AT 6:57 PM
Tiny
RASMATAZ
  • MECHANIC
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Disregard the power resistor, disconnect each injector connector check for battery power on the red/black and also on the distributor harness. Do you have it? If not check the ignition fuse/relay.
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Thursday, July 26th, 2007 AT 7:25 PM
Tiny
BATOSAI69
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Thanks a lot. I will check that next.
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Friday, July 27th, 2007 AT 5:53 PM
Tiny
BATOSAI69
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So I checked all four injectors with the key on and they are all hot on both sides. What's the deal?
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Sunday, July 29th, 2007 AT 6:38 PM
Tiny
RASMATAZ
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You might have a problem in the quad driver in the ECM circuit 10/20 to include E2.
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Monday, July 30th, 2007 AT 12:42 AM
Tiny
BATOSAI69
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So then whats the deal? New ECM?
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Thursday, August 2nd, 2007 AT 5:43 PM
Tiny
RASMATAZ
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It depends on your diagnostics-did you test the 2 wires going to the injectors while ECM is disconnected for a short to each other-if they're you need to track it. Changing the ECM will not do you good. If not touching together-then we can assume its the ECM. That's the one that powers it on and off.

BTW do you have spark? If not it could get complicated if the ECM don't get the Ne/G/Igt signals it will not fire up the injectors-However the wires to the injectors are both Hot, when not suppose to. You need to find out could be an injector solenoid that can be dragging down the rest that involves the injection system.
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Thursday, August 2nd, 2007 AT 6:27 PM
Tiny
BATOSAI69
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Yes I do have good spark. The only issue is the sudden loss of injector pulse and yes I did have the computer disconnected for sometime and the reinstalled and found that it would give me no codes when connecting the 2 diagnostic terminals.E1 and te1 I believe they are. Thanks in advance for any help.
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Saturday, August 4th, 2007 AT 7:02 PM
Tiny
RASMATAZ
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Okay, go find the power resistor it powers the injectors and the computer provides the grounding to turn it on and off.

You got me thinking here.

You said you have power on both pins at the injector connector. It tells me that the white/red or the white is touching the blue or yellow wire coming from the resistor. That's the only way to get power at both.
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Saturday, August 4th, 2007 AT 8:15 PM
Tiny
BATOSAI69
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Can you tell me where the resistor is located as the electrical diagram in the manual is not good. Thanks
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Sunday, August 5th, 2007 AT 5:45 PM
Tiny
RASMATAZ
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If it's not on the pax side on the fender, it has 2-big connectors on it, it doesn't come with it. You gonna have to test out the EFI and Circuit Opening relays.
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Sunday, August 5th, 2007 AT 7:56 PM
Tiny
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So since it was rebuilt 3 times by the same place before I was with the owner it developed a huge oil leak on the drivers side front of the engine. So i'm going to rebuild it anyway. Whats the feasibility of just ripping out the ECU and going with a carburetor intake and a Weber cutting out the airflow meter, injection, and EGR all together?
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Sunday, August 5th, 2007 AT 9:01 PM
Tiny
RASMATAZ
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Its a lot of work to do if I were you follow a 1987 model on its fuel/ignition system set up.
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Sunday, August 5th, 2007 AT 10:46 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Good afternoon,

The ECM is what pulses the injectors once it gets an RPM signal from the distributor. If there is no signal, it will not pulse or ground the wire that goes to the ECM.

You would need a scope ideally to check for a signal from the distributor. The fact you have spark tells me it is not that. I attached wiring diagrams for you.

You need to verify power at the ECM on the wires I attached. If there is then you need a noid light for the connector for the injector. Crank the engine and see if it flashes.

Chances are you need an ECM.

Roy
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Tuesday, March 24th, 2020 AT 3:08 PM

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