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1993 jeep crank no start
- Dunncr
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3 years 2 days ago #62793
by Dunncr
1993 jeep crank no start was created by Dunncr
I have a 1993 jeep grand Cherokee 4.0l no start. Long story short I found one of the 2 5v ref circuits with 15.5v. Has anyone seen this before? I ended up cutting the wire and still has the 15.5v coming from the pcm. I assume the pcm is bad but I was just wondering if anything else could cause this.
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- Noah
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- Chad
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- I am not a parts changer.
3 years 6 hours ago #62810
by Chad
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right.
Replied by Chad on topic 1993 jeep crank no start
The first thing I would check is the PCM Powers and, especially, Grounds. The voltage regulator, internal to the PCM, requires a good ground to reduce system voltage to 5 volts.
I remember a ScannerDanner Premium video where a Ford Explorer had 29 volts on the PCM power feed.
15.5 Volts DC? Do you have a battery charger on it?
It's hard to get more than battery voltage on a reference circuit.
I remember a ScannerDanner Premium video where a Ford Explorer had 29 volts on the PCM power feed.
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right.
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