1995 Cherokee Grand 5.2 ZJ wont start
#1
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Year: 1993
Model: Cherokee(SJ)
Engine: 4.0L
1995 Cherokee Grand 5.2 ZJ wont start
My 1995 Cherokee Grand 5.2 ZJ wont start. I was driving and it died all of a sudden the check engine came on and was flickering. There was fuel pressure and It kind of started but died. I had it towed to a mechanic, The next day I checked for pressure up front and there was none and the pump had no sound from the back. The mechanic hooked it up to his scanner and couldn't locate the main computer however he told me there was no fuel or spark. So now Ive towed it to the dealership and i know they are going to rape me. My mechanic says its either the computer or the alarm system. The alarm has always been wonky...
#2
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Welcome to the forum.
The first generation ZJ is a great vehicle. One reason is that it is possible for the owner to resolve 100% of the problems.
Two essential tools are the Factory Service Manual (FSM) and a fuel pressure gauge.
The factory alarm system could inhibit the engine from running, but that should be accompanied by the lamps flashing.
The scan OBD I works best w/ the Mopar DRB II scan tool. I had horrible results w/ quality aftermarket scan tools and excellent results w/ the Mopar tool.
The first generation ZJ is a great vehicle. One reason is that it is possible for the owner to resolve 100% of the problems.
Two essential tools are the Factory Service Manual (FSM) and a fuel pressure gauge.
The factory alarm system could inhibit the engine from running, but that should be accompanied by the lamps flashing.
The scan OBD I works best w/ the Mopar DRB II scan tool. I had horrible results w/ quality aftermarket scan tools and excellent results w/ the Mopar tool.
#3
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Year: 1993
Model: Cherokee(SJ)
Engine: 4.0L
I replaced the ECM 2 years ago with a rebuilt one. Im thinking the alarm too. Ill see what the dealership says..Hopefully I can bypass the alarm its useless anyways...
#6
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If the plan is to NOT turn your own wrenches, then sell the vehicle because there is NOT enough time or money that can be thrown at the car to be happy w/ the result.
The module w/ the failed components is the Instrument Panel Dimming / DRL Module. That failure is common. Some have performed repairs w/ acceptable results.
#7
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Year: 1993
Model: Cherokee(SJ)
Engine: 4.0L
I want to keep it! I love working on it but I only have a month to get this going. Now that I know what that part is its not the reason its not starting... Do you think the PCM needs to be replaced?
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#8
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The factory alarm system could inhibit the engine from running, but that should be accompanied by the lamps flashing.
The scan OBD I works best w/ the Mopar DRB II scan tool. I had horrible results w/ quality aftermarket scan tools and excellent results w/ the Mopar tool.
The scan OBD I works best w/ the Mopar DRB II scan tool. I had horrible results w/ quality aftermarket scan tools and excellent results w/ the Mopar tool.
When the alarm is active, the exterior lamps flash, the horn sounds and the dash security lamp flashes. Does the vehicle have any or all of those symptoms?
The vehicle requires the Mopar DRB II scan tool. I have had unacceptable results w/ every other scan tool.
My guess is that the PCM will communicate fault codes, even with an active alarm condition.
#9
Senior Member
Has every single fuse been verified good?
Is there fuel pressure? Does the fuel pump have voltage?
This reply shows my PCM capacitor replacement.
#10
Old fart with a wrench
IDK if this helps, but I had problems with my scanner not communicating with the computer and all it was was dirty connections in the diagnostic plug. I sprayed it with contact cleaner and made sure no pins were bent, then it worked.
#11
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Year: 1993
Model: Cherokee(SJ)
Engine: 4.0L
Is the PCM ECM together in one unit? I had a this computer replaced 2 years ago. this is what it looks like. This is the part number i used: ECM = R6026790
#12
Senior Member
The parts manual has over a dozen Single Board Engine Computers listed. The correct P/N is not clear to me from that document for your vehicle.
#15
Senior Member
That is probably not causing the fault, but that connector should be clean.
The PCM has had the capacitor rework, so that is good.