Jeep Electrical

Asked by nikbagnaschi Feb 23, 2019 at 11:27 AM about the 1999 Jeep Cherokee Sport 4-Door 4WD

Question type: Maintenance & Repair

Some backround: the jeep almost overheated
as i was driving up a steep grade, i pulled
over and turned it off until it cooled down. 10
mins later i started it up with no issue and
drove another 10 miles, all with the temp
being normal. Pulled up to a stop light and
the engine cut out on its own. Wouldnt restart
even with a jump. Towed it back home and
then i replaced the battery, starter relay first.
Buddy of mine tried to arc the starter and the
engine almost started so the then i replaced
the starter. Still didnt start and didnt even
turn over engine. Fuel pump works and was
able to arc the new starter so i have power.
Then we replaced the ignition coil. Still didnt
start. When i went to start it, security mode
popped on. Disabled that, then when i went
to try and start it, for the first time the check
engine light came on, pulled the codes and it
said there was a pcm error. What is going
on?

8 Answers
103,215

KenF answered 5 years ago

May want to try replacing the crank sensor before doing anything to the PCM. PCM is not only an expensive part but requires reprogramming at a qualified shop or dealership. No crank sensor input can cause no bus, no start issues, the overheating may have aggravated the issue.

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103,215

KenF answered 5 years ago

Still no codes? How are all the dash gauges, working fine? Does any engine die every time? May want to find a shop or dealership that can scan it with engine running to monitor PCM, if it is glitching then you'll obviously need a new one.

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nikbagnaschi answered 5 years ago

I cant even get the engine to start since it died the first time. Ill get out the code reader again. Ill post back in a sec.

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1,425

Jerry answered 5 years ago

I would be pulling and replugging the PCM molex connectors (at least give them a good wiggle). You may have some corrosion in there or cold solder joints on the connector pins.

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Your Answer:

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