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Has no spark

Tiny
LINDOPARK
  • MEMBER
  • 2000 CHEVROLET ASTRO
  • 168,450 MILES
The CKP signal is there to the PCM but there is no trigger signal at the ICM. There are NO codes displayed.

The van cranks well. I have wiring diagrams and have confirmed continuity between CMP, ICM, CKP to PCM. The problem seems to be that the PCM is not outputting the ICM trigger signal. Is there a security system issue which could be interrupting this signal and if so, how do I correct this.

David
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Tuesday, April 24th, 2012 AT 3:32 PM

7 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Check engine light on? Theft deterant light on?
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Tuesday, April 24th, 2012 AT 6:35 PM
Tiny
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Check engine lamp and security lamp are on briefly as usual but go off after a few seconds and my scan tool displays no trouble codes.I tried setting a code by disconnecting various sensors and then cranking the motor over. Even after doing so, scan tool displays no DTCs. No spark from coil tower with spark tester installed and all else hooked up.
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Tuesday, April 24th, 2012 AT 9:16 PM
Tiny
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Would try another scan tool if same results, not able to force a code suspect PCM
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Thursday, April 26th, 2012 AT 4:16 PM
Tiny
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I am considering disconnecting the ICM signal wire from the PCM and putting a quick earth to it to see if the ICM will fire the coil. What do you think?
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Friday, April 27th, 2012 AT 11:14 PM
Tiny
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Not a recomended proceedure you can have ICM tested at Auto Zone
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Tuesday, May 1st, 2012 AT 3:42 PM
Tiny
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Thanks but no Auto Zone, no Tech 2, no Chevy Dealers in this part of the world.
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Tuesday, May 1st, 2012 AT 6:08 PM
Tiny
DOCFIXIT
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Bummer go with grounding make sure signal wire unhooked from PCM. Do you have a DVOM?
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Wednesday, May 2nd, 2012 AT 2:58 PM

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