Two active codes. 12, 35

Tiny
BIGRED94
  • MEMBER
  • 1992 ISUZU TRUCK
  • 2.6L
  • 4 CYL
  • 2WD
  • MANUAL
  • 240,000 MILES
I have an engine light on and I did the flash code. The ECM flashed 12 and 35. I have a crank but no start. The truck has no spark. All spark related components have been replaced. Plugs, wires, ICM, distributor, ignition controller. I still have no spark. I am running out of things. I checked all of the ground location, everything is in good condition.
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Friday, March 16th, 2018 AT 6:42 PM

9 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good morning.

Code 12 is normal when checking codes on a no start.

35 is different. There is a wire harness issue. Below is the description of the issue. Inspect the harness carefully.

Roy

CODE 35 Ignition power transistor harness open circuit.
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Saturday, March 17th, 2018 AT 4:01 AM
Tiny
BIGRED94
  • MEMBER
Thanks for responding. Would you happen to know were the ignition power transistor is? I can start there and work my way back on the harness. I have tried to find what the part looks like so I can at least locate it.
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Saturday, March 17th, 2018 AT 6:55 AM
Tiny
ASEMASTER6371
  • EXPERT
It is under the intake manifold. Pictures attached.

Roy
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Saturday, March 17th, 2018 AT 7:04 AM
Tiny
BIGRED94
  • MEMBER
The pictures you have supplied belong to the ignition controller and the ignition control module. Both I am getting proper voltage to.
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Saturday, March 17th, 2018 AT 7:08 AM
Tiny
ASEMASTER6371
  • EXPERT
Bottom one is the power transistor.

Roy
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Saturday, March 17th, 2018 AT 7:14 AM
Tiny
BIGRED94
  • MEMBER
Do you by chance have the wiring schematic? Might possibly run jumper wires from the ECM to the sensor.
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Saturday, March 17th, 2018 AT 9:30 AM
Tiny
ASEMASTER6371
  • EXPERT
Attached.

Roy
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Saturday, March 17th, 2018 AT 9:37 AM
Tiny
BIGRED94
  • MEMBER
Thanks. Can one of the diodes in the fuse panel cause a no start problem if they failed?
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Saturday, March 17th, 2018 AT 9:54 AM
Tiny
ASEMASTER6371
  • EXPERT
No, they control the gauges.

Roy
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Saturday, March 17th, 2018 AT 10:01 AM

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