2001 jeep wrangler no start

[SaturdaysGS]

A buddy of mine has a 01 jeep wrangler with the 4.0/auto. Went to start it and it jut cranks. Lights and radio work fine, tried jumping it, still the same. Fuses all look good, and we hooked a scan tool up to it. The gauges do nothing and the scan tool doesn't even acknowledge the vehicle. Thinking it may have a bad PCM...? Thoughts?

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[Dasfinc]

A buddy of mine has a 01 jeep wrangler with the 4.0/auto. Went to start it and it jut cranks. Lights and radio work fine, tried jumping it, still the same. Fuses all look good, and we hooked a scan tool up to it. The gauges do nothing and the scan tool doesn't even acknowledge the vehicle. Thinking it may have a bad PCM...? Thoughts?

Check for corroded/bad/broken grounds.

 

[Outlaw]

Getting fuel? Spark? Start with the basics. Air/fuel/spark/compression is needed for an engine to run. Rule out the basics of each before digging deep into one. Just my .02

 

[CrawlinTBSS]

ive heard a common problem with jeep no starts is the crank sensor.

 

[daturbosix]

ive heard a common problem with jeep no starts is the crank sensor.

x2 gotta see what the computer is seeing as far as various signals go... could also be an ignition module

 

[JDHedman]

Trade for 05 cvpi ? Lol.

 

[CrawlinTBSS]

ahh noticed he said the scanner wont even recognize the car.... hrmmm

 

[JDHedman]

bad body ground would be my guess

 

[daturbosix]

ahh noticed he said the scanner wont even recognize the car.... hrmmm

oh! hmmmmmmmmm

was the jeep a mud toy?? maybe there are some corroded ecm harness connections.

 

[SaturdaysGS]

oh! hmmmmmmmmm

was the jeep a mud toy?? maybe there are some corroded ecm harness connections.

Yeah the scanner (Solus) wont even recognize the PCM. It was NOT a mud toy, just a DD. I will check the grounds tomorrow however.

 

[DarkShadow]

I had this happen on my 98 cherokee, crank sensor. if the sensor fails the pcm doesnt boot. so nothing will work until its replaced, try unplugging the sensor and see if you get a pcm boot.

If it has no check engine light period on right now even for the bulb check and cranking, and you disconnect the sensor and the light starts working.... thats it.

 

[Eagle]

crank sensor +1

 

[SaturdaysGS]

Will give that a shot tomorrow.. wheres the general location of the crank sensor??

 

[CrawlinTBSS]

its on top of the transmission itself. open hood. looking down in, it will be top right of the transmission bellhousing, at about your 1 oclock if looking at the trans as a clock.

the bolt holding it you will need to get to from under the car with some good extension and a swivel. we just did a motor replacement on a 4.0 jeep and i had to remove that to get hte engine out. get the bolt out, and slide the sensor up. its maybe 1.5 inches long. make sure the new one has the little peice of like wax paper on the tip of the sensor.


you may have to remove the intake mani to get at it good. i dealt with it with just a block and head in the engine bay so i could climb into the engine bay to get at it.

 

[SaturdaysGS]

its on top of the transmission itself. open hood. looking down in, it will be top right of the transmission bellhousing, at about your 1 oclock if looking at the trans as a clock.

the bolt holding it you will need to get to from under the car with some good extension and a swivel. we just did a motor replacement on a 4.0 jeep and i had to remove that to get hte engine out. get the bolt out, and slide the sensor up. its maybe 1.5 inches long. make sure the new one has the little peice of like wax paper on the tip of the sensor.


you may have to remove the intake mani to get at it good. i dealt with it with just a block and head in the engine bay so i could climb into the engine bay to get at it.

Alright doesnt sound too bad. Is it just a remove and replace or do I need to line it up/re-learn anything?

 

[bikrboy128]

no need to relearn. just plug and play

 

[SaturdaysGS]

Trade for 05 cvpi ? Lol.

If it was mine, I would.. I know hes looking to get rid of it soon tho. Roughly about 102k miles on it.

 

[CrawlinTBSS]

FYI, if you do take off the intake mani, it is the most tempermental son of a bitch. it needs to be lined perfectly on those dowls un the underside or youll get a mad vac leaks making the car surge to redline on startup.