Question about 2002 Jeep Grand Cherokee

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PCM OR ECM

JUST REPLACED ALTERNATOR ON MY SONS 2002 JEEP THEY SAY IF THAT IS NOT THE PROBLEM I SHOULD REPLACE THE PCM IS THIS EASY TO DO AND WHERE IS IT?HAVE LOOKED AT AUTO COMPUTER EXCHANGE AND THEY PROGRAMME IT, WOULD IT JUST BE A MATTER OF PLUGGING IT IN?

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I would just chang the alternatier. i never had any truble with the p c m change the alternator

Posted on Apr 20, 2009

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Where is the ECM located?


How To Change The PCM On A Chrysler PT Cruiser ...

? 14:05
https://www.youtube.com/watch?v=fLN48sAKpiE
Jul 24, 2014 - Uploaded by The Hapless Housewife
How To Change The PCM On A Chrysler PT Cruiser ... things wrong with my car now, but had I replaced the PCM (aka) ECM a long time ago, ...

Chrysler PT Cruiser Engine Computer Module ECM PCM ...

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Chrysler PT CRUISER Engine Computer Module ECM PCM ECU - "Plug & Play" in eBay Motors, Parts & Accessories, Car & Truck Parts ' eBay.

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Dec 30, 2015 | 2002 Chrysler PT Cruiser

1 Answer

I have an 2002 Cavalier Z24. I recently brought it in for repairs. The Technician replaced the ECM/PCM and it's still acting the same way....the alternator just won't charge the battery. it's a new battery...


Hey Joe , The first thing to do would be check for battery voltage on the heavier gage wire on the back of the alternator , if there is no voltage here there is a open circuit ! Which means the fusible link fried . This wire comes from the starter ! This charging system is controlled by the PCM , but they are rarely the problem . Do you have the charge indicator lit on the dash ? Do you have a check engine light on ? This system can set DTC'S - diagnostic trouble codes !
DTC B1328 DTC P0562 DTC P0563 DTC P0621 DTC P0622
.

Mar 25, 2015 | 2002 Chevrolet Cavalier Coupe

2 Answers

Hello, I have a jeep liberty 2002, I have p1686 runs and takes two seconds to turn off,, please if you can help me, thanks


you are swapping PCM's that be real bad.
on newer cars with Security this causes it to think your are a thief
and bricks the PCM (skim rules 101)
"until the pcm use in another jeep" huh?
SKIM is Phissed off.
http://www.jeepforum.com/forum/f9/trouble-code-p1686-905620/

Feb 01, 2015 | 2002 Jeep Liberty

1 Answer

Start and die after plugging in SKIM module


You do have a factory secuity system, and the used ignition lock is the problem, instyall the original lock into the used column.

Oct 05, 2012 | Jeep Cars & Trucks

1 Answer

Why no one has the answer for the "gauges light on" for Jeep Wrangler 1998?


get a meter and use to test with fully charged battery. the big wire should have battery voltage if not ck fuse if fuse good ck fuse box, if voltage present ck connector with running one should have battery voltage the other less than battery voltage. if no battery voltage alternator no good. if no voltage on less then battery its signal comes from ecm/pcm trace back wire to ecm/pcm if any bad spots repair.if ok replace ecm/pcm. if battery voltage present on other wire it goes to the alternator cut out relay trace wire and repair if bad,if good ch relay im not sure how it is wired but will try to find out tomorrow and get back to you.

Aug 14, 2012 | 1998 Jeep Wrangler

1 Answer

Diagnostic Trouble Code 332 JEEP LIBERTY ? WHAT IS THIS ?


2005 Jeep will be OBD II compliant and the trouble code(s) will be 4 digits after a P,B or U. Are you sure you wrote it down right?
For example P0332 for your car is Knock Sensor 2 Circuit Low Input (Bank 2)

Potential causes for a P0332 DTC include (but are not limited to):

  • The knock sensor is faulty and needs to be replaced
  • There is a wiring open/short/fault in the knock sensor circuit
  • The PCM/ECM has failed
Possible Solutions
  • Verify the resistance of the knock sensor (compare it to factory specs)
  • Inspect for broken/frayed wires leading to the sensor
  • Check the wiring and connections leading to/from the knock sensor and PCM/ECM
  • Verify proper voltage is reaching the knock sensor (e.g. 5 volts)
  • Verify proper grounding of sensor and circuit
  • Replace the knock sensor
  • Replace the PCM/ECM

Jan 25, 2011 | 2005 Jeep Liberty

1 Answer

2002 jeep


My wife had a similar problem with a 2003 Jeep Liberty. Her problem was that it stalled and she could not get it restarted unless it sat off for 30-45 minutes. It seemed like it was a problem with the alternator and battery but it had just gotten a brand new battery in it and we discovered the starter would roll over after the Jeep sat. We had it towed to the dealership and they replaced the Crank Sensor and the Timing Sensor and the Jeep now runs fine again. Side note: They charged us about $200 to fix these parts.

Aug 28, 2008 | 2002 Jeep Liberty

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