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The issue is No spark at the coil No Codes and a seemingly unconscious PCM

Tiny
LINDOPARK
  • MEMBER
  • 2000 CHEVROLET ASTRO
  • 168,450 MILES
No Codes = MIL OFF and Security Lamp OFF also. Engine 4.3L The issue is No spark at the coil No Codes and a seemingly unconscious PCM
Tuesday, April 24th, 2012 AT 9:09 PM

7 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
So what's the problem here?
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Tuesday, April 24th, 2012 AT 9:11 PM
Tiny
LINDOPARK
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Sorry, was not sure on how to reply before now. Posted one reply since. The issue is No spark at the coil No Codes and a seemingly unconscious PCM.
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Tuesday, April 24th, 2012 AT 9:22 PM
Tiny
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How do I confirm that the trigger signal from the PCM is or is not occurring? I've checked that the CKP 5V signal is available to the PCM, yet my LED lamp will not flash when connected to the white wire of the ICM which is supposed to be the trigger signal from the PCM
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+1
Tuesday, April 24th, 2012 AT 9:35 PM
Tiny
RASMATAZ
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The voltage at the CPS should be fluctuating if its synchronizing
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Tuesday, April 24th, 2012 AT 9:45 PM
Tiny
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  • 8 POSTS
It is fluctuating while engine being turned over using a wrench and 5V pulse is reaching PCM.
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Tuesday, April 24th, 2012 AT 10:09 PM
Tiny
RASMATAZ
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If its fluctuating check the ICM and the computer
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Tuesday, April 24th, 2012 AT 11:16 PM
Tiny
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Good voltage at ICM terminal A Pink wire. Good continuity Whte/blk wire
ICM terminal D to Ign Coil terminal C wire. Good continuity to earth at ICM terminal C Black wire. Dont have a scope and dont know what should be coming down ICM B terminal White wire from PCM. According to my diagram it should be an EST (Elec Spark Time Sig?)I did a AC voltage test and saw 1.5VAC while cranking. Is that good, bad or wrong test?
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Wednesday, April 25th, 2012 AT 12:29 AM

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