PCM issues - Ford Powerstroke Diesel Forum
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Old 11-30-2012, 07:07 PM
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PCM issues

I recently had my truck into a shop and had all the normal repairs done injectors, EGR delete, oil cooler and glow plug wiring harness. While it was in the shop the PCM went out they replaced it with a known to be good PCM and it also went out the last PCM worked but about a week passed and my truck died one day while driving I recranked it and none of the gauges on the right side of my cluster work. Tach trans temp and water temp. They checked the cluster and its not shorted out so it has to be the PCM what is going on and is there a cheaper fix than the grand they wanted?
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Old 12-01-2012, 12:33 AM
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the cluster is what's known as a gateway node or module, through which all modules on the CAN bus line communicate. problems with the cluster can cause loss of communication with other modules on CAN bus. what you want to do is measure resistance of the CAN bus line at the datalink connector. i believe pins 3 and 11 are CAN + and -. you should see about 60ohms resistance there due to the 2 120ohm resistors wired in paralell on the circuit. if you see 60ohms, try wiggling the instrument cluster connectors while reading resistance. if the resistance values become irratic, the cluster will need to be replaced and flashed

Last edited by kaya@bernhausen; 12-01-2012 at 12:42 AM.
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