1998 Jeep Cherokee won't start

Tiny
KMANGUM
  • MEMBER
  • 1998 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 16,000 MILES
I have a 1998 Jeep Grand Chaerokee will crank won't start; have replaced computer module, guages inside have no response, checked voltage from computer to crank shaft sensor, white and black wire measures only.05 volts, traced white and black wire back to the computer ohmms out perfect. Removed computer from running '98 cherokee no change, put my computer on that cherokee and it runs perfect. I am really stumped.
Sunday, September 13th, 2009 AT 9:08 PM

5 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check if its fuel or spark problem-Do below

Disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it
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Tuesday, December 17th, 2019 AT 7:06 PM
Tiny
KMANGUM
  • MEMBER
  • 3 POSTS
We have ruled out a fuel problem
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Tuesday, December 17th, 2019 AT 7:06 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
What about the ignition system-w/o spark there's no combustion -
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Tuesday, December 17th, 2019 AT 7:06 PM
Tiny
KMANGUM
  • MEMBER
  • 3 POSTS
There is no spark no fuel no power to the coil no power to the crankshaft sensor as I mentioned earlier as I understand if that circuit is compromised it also shuts off the fuel I have swapped computers as I mentioned earlier I even put mine in another vehicle and it worked fine. But I still do not know how to figure out where the power to crankshaft sensors origonates from.
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Tuesday, December 17th, 2019 AT 7:06 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check for power on the injector wiring harness dark green and orange and also at the coil -do you have it if not test the ASD realy
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Tuesday, December 17th, 2019 AT 7:06 PM

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