Sunday, June 3, 2012

2003 Dodge Ram: Faulty PCM no start?

The vehicle is not starting.There are many possibilities for this types of problem.
But if all checked ok,then its issue with the brain that cause no start problem.PCM means the brain of the vehicle.Also known as power control module.

Check the fuses,the ignition relay and other relays in fuse box.

If check engine light is ON,then scan for error codes.If no codes are coming up then PCM can be the issue.


To confirm the PCM is faulty, it can only be checked when the vehicle dies and wont start and doesnt make a sound.

On the PCM, there are 3 connectors - white, grey, black.

On the black connector, first back probe the dark green with black stripe wire at connecter terminal #22 for power. If no power, then it is being lost between the battery and the PCM.

If power, then check terminal #2, light green with black stripe for 12v going out. If 12v not present, then replace the PCM.

If 12v present, then  check for 12v at the ignition switch


For more help wiring diagram is provided below:----

PCM pinout diagram


This will help.
Thanks.


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1 comment:

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