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2001 Dodge Ram Van 3500 Question: no bus is displayed where the mileage is and i cant communicate with the compute

 

Question

Mike McDonnell, Laconia, NH, December 31, 2013, 18:57
 Rookie

Im trying to make sure that the pcm in the van is infact broken or shorted. Ive checked all the fuses and ive checked power and ground going into the pcm and that was ok but when i checked power at the connector going to the crank sensor i only had 2.7v DC when im suppose to have 5v. Do i need to go any further or is the pcm junk

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  • Answer #1

    pushrod December 31, 2013, 20:23
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     Master

    Got battery voltage and ground to the CKP sensor? Test the reference voltage to another sensor. Perform wiggle tests, look for signs of water intrusion at pcm harness connectors and 'rodent' damage!! You really need a flow chart for diagnosis and testing the system before condemning the pcm! Wiring harness troubles are common. Try www.alldatadiy.com

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    Mike McDonnell, January 11, 2014, 07:54
     Rookie

    thank you for answering my question. im going to recheck power and grounds over again and hope i find something wrong. there is alot of water on the wiring coming from the engine fuse block but its now frozen due to weather. i will check alldata for a flow chart, ive used it before and it has been helpful. i looks like it could take some time to find a short in the harness if thats where the problem is,thank you

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    pushrod, January 11, 2014, 07:59
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     Master

    Sure.

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