1986 Toyota 4Runner No injector ground Pulse = no start.

Tiny
ROSS MCKENZIE
  • MEMBER
  • 1986 TOYOTA 4RUNNER
  • 4 CYL
  • 4WD
  • MANUAL
  • 250,000 MILES
Hello. I have no injector control from my ecu. I can trigger the injectors by grounding their circuit at the ecu connector. My hall effect generator is able to cause the igniter to trigger spark at the correct time. (5*BTDC) The engine will start and then die as it burns what comes from the cold start injector during crank. From what I have read, the ecu will not trigger the injectors unless it gets a digital signal from the ignitor. I've replaced the three wires between the ecu and igniter. Code 11 is what I have. I have bypassed the tps portion of this code be jumping idl to e2 at the tps connector. I believe this should make it look like I want idle which would be a step in the right direction. I have tried another suspected good ecu with no change. Same for the igniter and the generator in the distributor. My fuel pump is good and my flapper door in the afm triggers it. My question is: What else does the ecu need in order to trigger injectors?
Friday, February 26th, 2010 AT 9:15 PM

9 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

Than you for the donation,

Code 11 is an A/C switch code, but looking at the diastionic chart it can be triggered by a faulty TPI and an internal ECU problem, i have added the flow chart for code 11 and the check list for the TPI, i hope that this is of assistance.

mark (mhpautos)

P.S. Sorry for the poor quality it's the best i gan get.


https://www.2carpros.com/forum/automotive_pictures/61395_4_runner_1_1.jpg



https://www.2carpros.com/forum/automotive_pictures/61395_4_runner_2_1.jpg



https://www.2carpros.com/forum/automotive_pictures/61395_4_runner_2.jpg

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Friday, February 26th, 2010 AT 10:06 PM
Tiny
ROSS MCKENZIE
  • MEMBER
  • 4 POSTS
Hello. Thank you for the tps check procedure. I have the factory service manual and have done their tests. My code 11 was likely due to the jumper in the diagnostic terminals (short in "T" circuit). I have replaced all conductors to the tps today and I now have a code 7. Back to tps, even idl jumped to e2 causes code 7. I still have no start. Even with no tps connection it should still start, correct?
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Tuesday, March 2nd, 2010 AT 2:36 PM
Tiny
ROSS MCKENZIE
  • MEMBER
  • 4 POSTS
Today after lunch I swapped computers with one I bought at a wrecker and now have no code 7 or 11. But no injector pulse still as tested with a noid light. It still will run for 2-3 seconds as the cold start fuel is burned and then it dies. I DO get the code #1, which indicates all is well in the diagnostic system. But still no injector ground pulse is provided by the ecm.
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Tuesday, March 2nd, 2010 AT 4:59 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

OK
well we do have fuel pressure and ignition signal, I will get onto Mitchell 1 and go through the system and see what I can find, as I am in Aust I am at work lust now but I will get onto it ASAP and post what I can find.

Mark (mhpautos)
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Tuesday, March 2nd, 2010 AT 5:06 PM
Tiny
ROSS MCKENZIE
  • MEMBER
  • 4 POSTS
Back to code 11.
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Tuesday, March 9th, 2010 AT 1:14 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi Ross,

As I am now moving house and my business some 300Kms I am running short of time to work on this with you, I have asked out top mod to take over and I am sure that he will be able to sort through this with you.

Cheers, Mark.
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Wednesday, March 10th, 2010 AT 5:25 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
DTC 11 The computer is not being powered up-check the EFI fuse if okay check for power at the computer wiring connector white and blue wire that goes to the BATT on the computer. If no power on the wire you have an open all the way back to the EFI fuse. Power present-check and test the injector driver circuit 10 and 20 to include the EFI resistor

11 ECU Power Supply.
12 Engine RPM Signal.
14 Ignition Signal.
21 Oxygen Sensor (OS) Signal.
22 Water Temperature Sensor (THW) Signal.
24 Intake Air Temperature Sensor (THA) Signal.
31 Air Flow Meter Signal.
32 Air Flow Meter Signal.
41 Throttle Position Sensor (TPS).
42 Vehicle Speed Sensor (VSS) Signal.
43 Starter Circuit Signal.
51 Switch Condition Signal.
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Wednesday, March 10th, 2010 AT 6:08 PM
Tiny
P-RAT
  • MEMBER
  • 1 POST
Had the same issue with my 87 4Runner, no ECU pulse to injectors. I tried everything in the book, but the problem was bad wire in the end. For some reason Toyota decided to splice four wires from the injectors into two wires back to the ECU. The splice is made in the main engine harness approximately where the harness leaves the intake manifold and is next attached to the passenger side fender well. If you remove the tape and coating from the harness, you'll find a white wire with a red tracer, and a white wire with a blue tracer. These wires are spliced with a mechanical crimp to the four wires going back to the injectors, of the same color. This termination can appear to be attached, but if it has any sign of corrosion, the wire should be cut back and replaced with a new conductor. THIS IS PROBABLY YOUR PROBLEM AND WILL PROBABLY FIX IT.
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Tuesday, September 27th, 2011 AT 1:08 AM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Thanks for the input P-Rat
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Thursday, September 29th, 2011 AT 6:12 AM

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