Question about 1994 Jeep Grand Cherokee
Jeep wont start
Why not let the PCM tell you what sensor is bad.
and do the spark test, x 4 x 6? ???
if spark is all bad.
insert the diagnostic jumper wire.
then key on,
then crank for 5 seconds.
flash code will tell you if any of 3 inputs are bad, 2 sensors or spark.
The ECU cuts all fuel if it even THINKS spark is bad.
why not test spark?/ like we do for 100 years now.
its no secret how.. like 125 million google hits. (what a million hits for every year./ LOL)
this trick works on all cars and jeeps from 1988 to now.
all. all with EFI and jeep used EFI in 1988, I had one,(renix sys)
your next learning path is the ASD relay,
its just a relay that kills injection, and friends.
it drops out of the ECU thinks there is no park for 2 seconds cranking.
Posted on Feb 15, 2014
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Posted on Jan 02, 2017
At least take the time to remove your computer connector & check & clean all contacts with battery disconnected, negative first.. Clean good with an electrical cleaner spray can. re-connect then re-connect battery, with negative last.
Posted on Jan 29, 2009
SOURCE: 1994 jeep wrangler no fire
Crank position sensor has a higher failure rate than it should...however i would not change it "at random" Check for continuity between b&c terminals of the sensor with a digital ohmeter.
There should be no continuity between them (b&c should be marked on connector) No continuity reading is same as when probes are not connected to each other.
I really dislike when people try and help and use terms that owners can't understand ... "check your zxy and qtr then add an abc" dosen't seem helpful. I hope I am as clear as I can be!!!
Posted on Apr 15, 2009
Replacing the O2 sensors in a large majority of cases is changing the result, not the cause of the problem....Large variations in exhaust quality often are beyond the operating range of the sensor, causing it to throw a code. Sort of like a situation where you are trying to read something but the words are too small to see so you (like the sensor) will say "I can't read this"...nothing wrong with you, So putting another person where you were won't change anything...words are still too small, and they too will not be able to read them.
A code scan and some individual component tests will likely give you an idea what's going on ...either you have too much/too little fuel, or ignition spark is weak. Any of these items have several causes but can change the quality of the exhaust enough to cause your problem.
Largest problem with offering an on-line diagnosis for you is that without the ability to do the testing I suggested, all I could offer would be guesses. (which can lead to expensive mis-diagnosis)
Posted on Jul 06, 2009
If it is a factory alarm you can't unhook it. Replace the switch attached to the lock cylinder inside the door. In the meantime, the switch on the passenger door may still be good. Cycle the key in the passenger door to see if it turns off the alarm.
Posted on Oct 16, 2009
Sit on top of transmission bell housing, you can get to it from under the hood, drivers side on top on transmission, held on with 10mm bolt. unplug harness to sensor, remove bolts, and replace.
Posted on Aug 16, 2010
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