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Old 08-04-2014, 04:29 PM
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ECM prices and what to buy?

I may haver an issue with a bad ECM does anyone know where I can get a used one or who sells them reasonable and good ones? My issue with the key not turning truck off may be a bad ECM I am being told also how would I check to see if it is a bad ECM or possibly a bad ground somewhere may cause the key not turning off truck but it doers turn off tach and speedo / dash unit? thanks
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Old 08-04-2014, 07:52 PM
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A lot depends on the type of PCM and the programming code. Rock Auto usually has them reasonably (got one for my 94 for only $115 plus refundable core). If you happen to have a DPC-312 like my 97 (California Splitshot programming with E4OD trans), good luck as they are pretty hard to find! Personally I wouldn't think the PCM is your problem. There would have to be something external causing the power to "stay on" to the PCM. JMO however. Cheers!
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Old 08-05-2014, 09:21 AM
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Extremely unlikely that's the PCM. But don't assume, TEST. Put a voltmeter on underhood fuse #22 while the engine is running; it should show voltage. Then turn the key back. Presuming the engine will still be running, check the meter again. If it still shows voltage, there's a problem with the ignition switch or wiring, UPstream of the PCM.

Could be something as simple as a sticking PCM power relay.
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Old 08-05-2014, 06:46 PM
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If it is running with key off, you could always pull underhood fuse 9 and see if that kills it. That would point to the sticking PCM Power Relay. Cheers!
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