1997 Other Jeep Models 1997 Jeep Grank Cherokee blowing fuse

WOLVIE56X

MEMBER
1997 JEEP
6 CYL
4WD
AUTOMATIC
305,000 MILES

My 1997 Jeep Grand Cherokee Limited has been blowing the same fuse for a week now, but it seems to only happen the the vehicle comes to a stop.

its the PCM fuse, which also has the automatic lights, instrument panel, radio amplifier and the vehicle body panel

i think there may be a few more on there, but its a really important fuse for the jeep, when it blows, the computer goes dead

we checked every open wire, the radio wires, the disconnected amp wires, the battery teminals and wires, checked to see if the fuse box was grounded properly, we are complete stumped right now

when the vehicle is moving, there are no problems, but when we come to a light or stop sign, it goes dead

and only that fuse is being blown

before this issue, we were never able to use the auto lights, they would just keep flickering instead of staying on and the interior lights could not be used, if turned on, they would go right out, but not blow the fuse

the vehicle shows no signs of any issues other then coming to a stop and the fuse blowing

2 Replies

JDL

MECHANIC
16,098 POSTS

Hello, is it the 15 amp fuse that blows? The control side of fuel pump relay--asd relay--ac compressor relay are on that fuse circuit along with 3 or 4 other systems. I'd have to separate the circuits one at a time, try to see which one is blowing the fuse.

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Saturday, August 1st, 2009 AT 11:09 AM

WOLVIE56X

MEMBER
2 POSTS

But the short story of it, CHECK THE DAMN O2 SENSORS THOROUGHLY!

Ill list everything we did check and got no results, fuse #5 from the engine fuse box kept blowing, which houses the PCM/ASR

we followed the wiring harness ALL the way around and back to the computer, NOTHIJNG, no melting, no rubbing, no problems

we then took apart the engine fuse box and played around with the tightness of the area the fuses slipped in, nothing

got an error report, made it to Auto Zone and the computer was reading high voltage on the O2 sensor, but the guy was sure it was the front one, so spent $70 to replace that and still nothing

after about 6 hours of going through EVERYTHING, we gave up, sat in the jeep with my dad, he was flipping through the manual and the Jeep Haynes book and I was on my iPhone googling different wording and then we found it

the number ONE reason that fuse ever blows is from a malfunction with the either of the 2 O2 Sensors

so my dad crawled up under the middle of the Jeep and sure enough, the the wires for the O2 Sensor behind the catalayic convertor was dangling down and rubbing ont he axel

completely rubbed the rubber off the wiring and was making full contact on the axel

problem SOLVED

if anyone needs any info on what we did, I can post more

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Saturday, August 1st, 2009 AT 5:37 PM