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Manually turning the engine causes the ASD relay to close momentarily

Tiny
JLPIERCE
  • MEMBER
  • 1993 DODGE DAKOTA
  • 5.2L
  • V8
  • 2WD
  • AUTOMATIC
  • 168,000 MILES
On in initial "key on" the relay does not close. Shorting the wire to pin 51, at the PCM, closes the relay and gives me fuel press. And spark. Manually turning the engine causes the ASD relay to close momentarily (when it receives signal from cam sensor). Same results on three PCM's, one rebuilt.

Thanks,
Jack
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Tuesday, June 26th, 2018 AT 3:16 PM

6 Replies

Tiny
AL514
  • MECHANIC
  • 4,099 POSTS
You might want to check all the ECM powers and grounds. Sound like you have a broken wire somewhere. Check under the fuse box that the ASD relay is in and make sure those pins are good. They corrode underneath and can be a pain to find.
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Wednesday, May 5th, 2021 AT 9:53 AM
Tiny
JLPIERCE
  • MEMBER
  • 4 POSTS
No corrosion found from bottom of ASD to PCM.
I am lost, but I feel the following is true, but I am ready to be corrected.

ASD closes when shorting at PCM pin 51, would indicate a satisfactory circuit. ASD closing with cam sensor signal would also indicate a satisfactory circuit.
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Wednesday, May 5th, 2021 AT 9:53 AM
Tiny
JLPIERCE
  • MEMBER
  • 4 POSTS
I have good grounds (pin 11 and 12) and good battery and ignition voltage supply to PCM.
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Wednesday, May 5th, 2021 AT 9:53 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,861 POSTS
Is the security light flashing when you try to start the car? It sounds like a computer issue not closing the relay, but we should check the wiring. Here is a guide to help you and the ASD relay wiring diagrams:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Please let us know what you find.

Cheers, Ken
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Wednesday, May 5th, 2021 AT 9:53 AM
Tiny
JLPIERCE
  • MEMBER
  • 4 POSTS
FYI.
I finally found the problem! The PCM evidently will not close and hold the ASD without proper (in time) cam sensor input. I rotated the distributor rotor 180 degrees and the engine fired right up.
Thanks for your help.
Jack
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Wednesday, May 5th, 2021 AT 9:53 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,861 POSTS
Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros. Com anytime we are here to help.

Cheers, Ken
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Wednesday, May 5th, 2021 AT 9:53 AM

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