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Can I get the engine wiring diagram for the PCM?

Tiny
DARIN EMMETT
  • MEMBER
  • 1998 DODGE DAKOTA
  • 5.2L
  • V8
  • 4WD
  • AUTOMATIC
  • 100,000 MILES
Hello, I am looking for the engine wiring diagram for the PCM for the 5-volt power supply. The engine runs and then periodically shuts off losing 5-volt supply.
Saturday, January 27th, 2024 AT 6:57 AM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,940 POSTS
Sounds good, here is a guide to help check the wiring and the engine wiring diagrams as you have requested:

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

The five-volt reference can be disrupted by a shorted sensor, when you lose the reference, I would start unplugging sensors to see if it comes back. Check out the images (below). Let us know if you need anything else.

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Saturday, January 27th, 2024 AT 12:04 PM
Tiny
DARIN EMMETT
  • MEMBER
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Thank you for the schematics. Still having the same issue. Engine dies, no 5-volt ref and no buss message on odometer. If the connectors to the PCM are wiggled power comes back. PCM has been replaced with a rebuilt. I'm thinking the new PCM is bad as well? Unplugging sensors has no effect. All pins and connections at the connectors look good as well.
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Monday, January 29th, 2024 AT 4:15 AM
Tiny
DARIN EMMETT
  • MEMBER
  • 9 POSTS
Thank you for the schematics. Still having the same issue. The engine shuts off, no 5-volt ref and no buss message on odometer. If the connectors to the PCM are wiggled power comes back. PCM has been replaced with a rebuilt. I'm thinking the new PCM is bad as well? Unplugging sensors has no effect. All pins and connections at the connectors look good as well.
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Monday, January 29th, 2024 AT 6:32 AM
Tiny
KEN L
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I have seen an instrument cluster cause this issue as well. Can you try unplugging it to see if the 5 volts comes back? Also, it does sound slie the new PCM is bad as well, did it have the same problem with the old PCM?
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Monday, January 29th, 2024 AT 10:14 AM
Tiny
DARIN EMMETT
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  • 9 POSTS
Yes same problem with the old PCM.
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Monday, January 29th, 2024 AT 10:17 AM
Tiny
DARIN EMMETT
  • MEMBER
  • 9 POSTS
I can try unplugging the instrument cluster and let it run to see if it shuts off if the engine will run that way?
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Monday, January 29th, 2024 AT 10:20 AM
Tiny
KEN L
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It might, let's give it a try. Let me know what happens.
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Tuesday, January 30th, 2024 AT 9:59 AM

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