Question about 2002 Chrysler PT Cruiser

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My daughter has a 2002 PT Cruiser w/ 2.0 engine. auto/trans non turbo.I'm NOT much on the new cars.It keeps running the battery down or does not charge it.They took it to a garage in this area,which none are much.They can't afford a lot of money.They were told that it was not the alternator but was some sort of computer that controlled the electrical system.The garge doesn't even know the name of the component.Is it the PCM? Can somebody please help. Terry

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I doubt it is the PCM, though it could be, as the voltage is regulated by the PCM. It could also be the fusible link. There is a way to test, if you have a voltmeter. With the engine running, check the voltage at the alternator terminal. It should be at least 14 volts or more. Also check it at the battery. It should be the same. If lower at the battery, replace the fusible link.
If it's the same at the battery and both are above 14 volts, the charging circuit is probably fine and the problem may be a short in the car. I can send troubleshooting steps for a short if someone is good with electric circuits.
If the voltage is lower than 14 at the alternator terminal, then either the alternator is bad or the PCM is bad, and your mechanic may be right.
My daughter has a 2002 - 144ad56.gif

Posted on Sep 29, 2010

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