ECu fuse blown
01-04-2012, 03:41 PM
#1
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Year: 1991
Model: Cherokee
Engine: 4.0
ECu fuse blown
Hey guys,
So yesterday I was driving home and the car just died. I checked and the fuel pump was not working, but the check engine light was not on either. This led me to the 30amp fuse for the ecu/fuel pump etc. It was indeed blown so I replaced it and it blew again. Once I got the car towed home I put in a new fuel pump(had an extra) just to ensure there was not a short in the pump. I know this fuse controls a lot of stuff, but I just wondered if anyone had any leads on a probable place to start looking before I start tracing all the wires to find the short. It is a 1991 Laredo High output 4.0 manual so you know.
Thanks for any help in advance
Brendan
So yesterday I was driving home and the car just died. I checked and the fuel pump was not working, but the check engine light was not on either. This led me to the 30amp fuse for the ecu/fuel pump etc. It was indeed blown so I replaced it and it blew again. Once I got the car towed home I put in a new fuel pump(had an extra) just to ensure there was not a short in the pump. I know this fuse controls a lot of stuff, but I just wondered if anyone had any leads on a probable place to start looking before I start tracing all the wires to find the short. It is a 1991 Laredo High output 4.0 manual so you know.
Thanks for any help in advance
Brendan
01-04-2012, 08:56 PM
#2
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Year: 1991
Model: Cherokee
Engine: 4.0
Found the problem;
The o2 sensor wire had touched the header and melted through grounding it and blowing the fuse. Just a heads up if anyone has a similar problem.
Thanks
The o2 sensor wire had touched the header and melted through grounding it and blowing the fuse. Just a heads up if anyone has a similar problem.
Thanks
01-04-2012, 10:18 PM
#3
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Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Thanks BB. One to watch for. Guess there's a TCU, PCM, and ECU, (Renix). (guess somebody likes alphabet soup). 
Last edited by DFlintstone; 01-04-2012 at 11:50 PM. Reason: ECU
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