Possible ASD relay issue?

TYLER PARKINS

MEMBER
1999 JEEP GRAND CHEROKEE
4.7L
V8
4WD
AUTOMATIC
156,000 MILES

It was running fine then noticed it was getting warm pulled over let it cool down went to start it nothing. Turned the key I get 1 click.
So, I get under jeep jump the starter it turns over but no start. Fuel pump is not priming when turn the key (brand new pump literally)
Went to pump relay jumped it. The pump does turns on.
Recap
•Ignition won't work with key but will work if manually jumped
•pump will not work with key but does work
• checked and replaced all pump and ignition fuses and relays. Including the ASD relay and the other bigger relay.
Brand new battery
• Still won't start. Do I need to take it out of ASD mode or something?

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
48,505 POSTS

It sounds like the ignition switch itself is bad but to be sure let's check for power at the DR/BLU, RED/BLK and BLK/ORG wire from the ignition switch when the key is in the on position, this guide can help:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

If one or more of these wires do not have power with the key on the ignition switch is bad and needs replacement. Here is the ADS relay location if you want to try swapping it out. Check out the images (below). Please let us know what happens.

Images (Click to make bigger)