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ASD and fuel pump relays?

Tiny
MURRELL
  • MEMBER
  • 1999 JEEP CHEROKEE
I am working on this 1999 Jeep and it will not start. I have checked all fuses, relays, grounds, and battery voltage all are ok. I have replaced the engine computer with a used one and I am still having the same problem. But, I am not sure if the used one was any good. Where is the ASD relay or fuel pump relays? James
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Saturday, December 30th, 2006 AT 1:51 PM

7 Replies

Tiny
MWHITNEY
  • MEMBER
  • 63 POSTS
Here is a guide to help you check the relays with the ASD and fuel pump relay location in the diagrams below.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.

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Tuesday, January 16th, 2007 AT 8:23 PM
Tiny
JACKIE1213
  • MEMBER
  • 2 POSTS
  • 1997 JEEP CHEROKEE
  • 6 CYL
  • 2WD
  • MANUAL
  • 17,000 MILES
My jeep all of a sudden wouldn't start the battery was good and we thought it was the fuel pump. We replaced that and it still won't work. There is no power getting to the coil, distributer. We have been told by several people that it could be an asd relay. Any ideas of the problem please
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Wednesday, September 30th, 2020 AT 3:12 PM (Merged)
Tiny
INTERNETMECHANIC
  • MECHANIC
  • 700 POSTS
The asd relay or circuits could be a possibility? Have you tried checking for possible mil codes?

The dark green wire with orange tracer is primary voltage to the coil. That wire should be hot with engine cranking.

Try this to check for mil codes. When cycling the key, you don't crank it, just turn till dash lites come on.


https://www.2carpros.com/forum/automotive_pictures/512072_cherokee_mil_1.jpg

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Wednesday, September 30th, 2020 AT 3:12 PM (Merged)
Tiny
JACKIE1213
  • MEMBER
  • 2 POSTS
  • 1997 JEEP CHEROKEE
  • 6 CYL
  • 2WD
  • MANUAL
  • 170,000 MILES
Location and how to check if it is bad
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Wednesday, September 30th, 2020 AT 3:12 PM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
ASD relay is in the power distribution center, right fender side shield. learn how to check relays at

https://www.2carpros.com/how_to/how_do_i_check_a_relay.htm

Please run down these guides and report back.
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Wednesday, September 30th, 2020 AT 3:12 PM (Merged)
Tiny
RAYDEL
  • MEMBER
  • 1 POST
  • 1996 JEEP CHEROKEE
  • 4 CYL
  • 4WD
  • MANUAL
  • 121,000 MILES
New cam shaft sensor, rotor, cap, crankshaft sensor no spark at distributor and no voltage at the gas tank for the fuel pump. Could it be the ECM or the auto shut down relay? Where is the brain located?
I got the jeep not running, so said it just died on them and they thought it ran out of gas.
I figure if I know what I'm looking for I can just
find a brain box at a junk that will work.
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Wednesday, September 30th, 2020 AT 3:12 PM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
Are you aware there will only be voltage to the fuel pump for one second after turning on the ignition switch? After that, the voltage should come back during engine rotation, (cranking or running). A quick and easy test is to measure the voltage on the small ignition coil wires. See if it is there both times or just for that first second.
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Wednesday, September 30th, 2020 AT 3:12 PM (Merged)

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