By the '96 Jeep Grand Cherokee that I sold to my brother when I bought my Dodge. He was over here the other night, went home and parked it. Next day he goes to start it and it turns over, but won't start. Sounds like no spark. Today, we start checking things out. Did a spark test and sure enough, no spark. Checked the coil, it's OK. Retrieve codes and it says #11, no signal from CPS or CKS. Checked the CPS and it looks bad, but it could also be the PCM. CKS tests OK. Decide to take a chance on the cheap fix and replace the CPS (which Autozone and Pep Boys call the coil pickup). Still no start. Ring out the CPS and CKS circuits going to the PCM. Everything is good. Get a rebuilt PCM thinking that has to be the problem. Still no go. So frustrated at this point we both could spit nails. My brother is out $240 and still has a dead Jeep. Test the TPS and it appears to be OK. Can't think of what else could be the problem. What other sensors could cause a vehicle not to start? I owned this Jeep for 10 years without a single problem beyond brakes, tires, batteries and a water pump. Has only 110k miles. Any suggestions appreciated.

I forgot to add that there was no CEL and the trouble code was after-the-fact since we were cranking it without it starting. Can an OBDII scanner diagnose or is it only for retrieving/clearing codes? Give me a carburetor any day, this solid state crap is maddening.

 

So who did u get yr *** kicked?

 

Couldn't make it any clearer, I think.

 

Sorry I though like u got it kicked. Not by the jeep.

 

you said you checked the cps and cks. also make sure that thier is good contact and no rust or anything from getting a bad connection. we had a car come in as a no start in school and it turned out being a bad connection, removed the crank position sensor cleaned it up good and put it back on and it started up. just an idea, let me know what you find.

 

Have you checked the ASD relay?

Did you check the fuse in the fuse box for the PCM? When I accidentally blew that fuse, the truck would turn over and generate a CEL but not start.

 

Yes.

Hmmmm...have to look at the wiring diagram and see which one that is.

 

what about the map sensor ??

 

Possibilities:

1. Check the Ignition System relay.
2. You said you checked the crank sensor circuit, but did you actually try a new crank sensor? I don't know a way to verify a good or bad crank sensor without actually swapping it out to see. The sensor will pass voltage without actually working correctly.
3. You didn't move the distributor out of sync when you replaced the pick up sensor did you?
4. Did you verify voltage to the coil?

 

Very nice aim!