Testing a PCM??
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From: Dallas Ga
Testing a PCM??
Is there a way to test the PCM? My friends truck keeps blowing the #18 fuse in the power distribution box. I have disconnected the O2 sensors, IAC, Map sensor, fuel pump relay, PCM relay and the PCM. The only time the fuse won't blow when turning the ignition is when the PCM is disconnected. The low beams, wipers and radio are not working as well. Any ideas on what to check??
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From: Dallas Ga
PCM, fuelpump relay, mass airflow sensor. I have checked the wires to the O2 sensors and every other wire I can find for a short but I have not found one. Just before the truck quit running, the wipers came on, the headlights flashed, and the radio quit. He heard what sounded like a pop sound and it died. It will crank but won't start. The battery top was also popped up from the case on one side.
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PCM, fuelpump relay, mass airflow sensor. I have checked the wires to the O2 sensors and every other wire I can find for a short but I have not found one. Just before the truck quit running, the wipers came on, the headlights flashed, and the radio quit. He heard what sounded like a pop sound and it died. It will crank but won't start. The battery top was also popped up from the case on one side.
Or lightining, or a power pole wire hitting the truck in a tornado, hurricane, or earthquake.
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