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1996 Jeep Grand Cherokee was running fine then nothing after…

1996 Jeep Grand Cherokee was...
1996 Jeep Grand Cherokee was running fine then nothing after we moved around parking lot.
It has no check engine illuminated when key is on, no fuel gauge (shows E all time, has
plenty of fuel), no fuel pulse or activation, no spark. Replaced CPS already, tested ASD
and Fuel Pump Relays, they are clicking. o2 sensors look and test ok.Scan tool will not communicate with vehicle. We were able to test the PCM connection and
it has no power. We did test a new ignition switch also, still nothing.
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Customer reply replied 3 months ago
Getting power to:
A22
B30
C1
C3
C19
C20
Answered in 27 minutes by:
3/23/2018
Mark
Mark, 22 Year Factory trained technician
Category: Jeep
Satisfied Customers: 11,593
Experience: Jeep factory training........25 years in the industry.
Verified

Welcome to JA my name is Mark, and I'll be more than happy to assist you, Please allow me a few minutes to review your information. Thank you.

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Customer reply replied 3 months ago
also power on A2
Customer reply replied 3 months ago
Just checked also, A31 and A32 do have ground

Awesome. Thanks for your detailed post. OK, I've has a look at the PCM connector pinout and you have the correct powers, the only thing we don't know about are the grounds, did you check the grounds?

If the grounds are good, then it is time to condemn the PCM and this is not uncommon on these Jeeps.

A PCM that has correct power and ground, MUST turn on the check engine light at key on. If it fails to do that, then it is a dud and needs to be replaced.

Hope that helps.

When you are satisfied that I have answered your question, please provide a 5 star rating since this is how your expert is compensated for taking time out of their day to assist you. However, if you need any more info please reply back to me before you provide any rating, Thanks again!

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Ha......we posted at the same time.

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Customer reply replied 3 months ago
Wer are pinning them all out now seeing what is what. I appreciate your help.
Customer reply replied 3 months ago
Give me a few and I will know what is grounded and what is not.

No worries.....

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Customer reply replied 3 months ago
All that have ground (DISCONNECTED FROM PCM, STRAIGHT AT PLUG):
A6
A7
A30
A31
B4
B5
B6
B10
B12
B15
B16
C4
C5
C11
C12
C23

Perfect. That matches my pinout, so you have a dud PCM. Time to source out a replacement.

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Customer reply replied 3 months ago
Thank you we appreciate it. Didn't want to replace and not be it, without being certain :)
You're very welcome, please don't neglect to leave a rating. Much Appreciated!
Mark
Mark, 22 Year Factory trained technician
Category: Jeep
Satisfied Customers: 11,593
Experience: Jeep factory training........25 years in the industry.
Verified
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