The ECM fuse keeps blowing and was wondering if.

ANONYMOUS

MEMBER
1998 JEEP GRAND CHEROKEE
117,000 MILES

The ECM fuse keeps blowing and was wondering if you could direct me in the direction as to what may be causing it to blow! All help and answers would be greatly appreciated! Thanks in Advance for your time! Its a 1998 Grand Jeep Cherokee Laredo 4.0 6 cylinder.

Saturday, March 2nd, 2013 AT 12:25 AM

2 Replies

CARADIODOC

MECHANIC
34,184 POSTS

First look at the wiring harnesses for the oxygen sensors to see if one fell down onto hot exhaust parts.

A simple trick to finding a short is to replace the blown fuse with a pair of spade terminals, then use small jumper wires to connect them to a 12 volt light bulb. A brake light bulb works well. When the circuit is live and the short is present, the bulb will be full brightness and hot so be sure it's not laying on the carpet or against a plastic door panel. Now you can unplug electrical connectors and move things around to see what makes the short go away. When it does, the bulb will get dim or go out.

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Saturday, March 2nd, 2013 AT 2:23 AM

YOURMAMA

MEMBER
1 POST

Look at the inside cover to the fuse box labelled ACCESS TO FUSES AND RELAYS. Locate the relay labeled "AC/Clutch". Locate the relay labeled "Fuel Pump". Switch them. Or, better yet, discard the Fuel Pump relay you just pulled. Replace the 20 yellow fuse for the ECM (the burnt out one that burns out every time you put the key in the accessory position). Start car.

At your leisure, buy replacement relay on ebay for under $7 shipping included from e-bay and enjoy air conditioning again.

Your Mama!

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Saturday, July 4th, 2015 AT 6:40 PM