No 8v reference from PCM to distributor

Tiny
TITANG9
  • MEMBER
  • 1994 DODGE CARAVAN
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 144,000 MILES
(Vin: 2B4GH2538RR719437)

No spark condition.
8v orange wire from PCM to distributor (not present with key on)
Check all fuses and substituted ASD relay= okay
Voltage and grounds on PCM harness side= okay
How to test the PCM to be sure it has failed?
No OBD port.
Multimeter (fluke 88v).
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Thursday, September 23rd, 2021 AT 3:34 PM

7 Replies

Tiny
KASEKENNY1
  • EXPERT
You did it. The way to test supply voltage is to unhook the connector at the component and check for voltage on that pin to a known good ground.

https://www.2carpros.com/articles/how-to-use-a-voltmeter

So when you are not getting no voltage with this key on then that control module is not sending it and has failed.

This applies to any supply voltage including a 5 volt supply.

Sounds like the driver in the module has failed and needs replaced. The ASD and other relays would not effect this as the PCM controls these relays through the ground side but would not effect the supply voltage.

Take a look at the info below but sounds like you don't need it. In case others in the future this includes the wiring diagram on the wire you are referring to.

Please let us know what questions you have. Thanks
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Thursday, September 23rd, 2021 AT 6:22 PM
Tiny
TITANG9
  • MEMBER
Thanks, I needed to be sure that I have to replace the PCM.
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Thursday, September 23rd, 2021 AT 7:29 PM
Tiny
KASEKENNY1
  • EXPERT
Yep. Clearly I am not looking at the vehicle but if it were me, I would be ordering a PCM for it as well.

Thanks for using 2CarPros. Please let us know how this turns out. Thanks
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Thursday, September 23rd, 2021 AT 7:30 PM
Tiny
TITANG9
  • MEMBER
Does it need to be programed by a locksmith because of the immobilizer system?
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Friday, September 24th, 2021 AT 4:25 PM
Tiny
KASEKENNY1
  • EXPERT
I don't think this vehicle has an immobilizer where there is a chip in the key. I think it only has the keyless entry. When you turn the key on, do you have a red theft light on the dash?

I don't show one on this vehicle so no it does not.

However, if you happen to have one, then yes they need to be programmed.
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Friday, September 24th, 2021 AT 4:30 PM
Tiny
TITANG9
  • MEMBER
After a long waiting, finally the PCM arrived. The car started right up.
Thanks!
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Tuesday, October 5th, 2021 AT 6:47 PM
Tiny
KASEKENNY1
  • EXPERT
That is great. Thanks for returning and letting us know that this was the issue.

Thanks for using 2CarPros. Please come back next time.
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Wednesday, October 6th, 2021 AT 2:13 PM

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