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BAD PCM? Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Car Troubleshooting REYGS User Nov 21, 2006, 5:11 PM Post #1 of 3 (3249 views) BAD PCM? Sign In 1998 cavalier inop cooling fan. new fan motor and relay there is power at relay but no ground from pcm. BAD PCM? HELP! Forgot to mention new temp sensor also. (This post was edited by REYGS on Nov 21, 2006, 5:18 PM) steve01832 Veteran Nov 21, 2006, 5:57 PM Post #2 of 3 (3244 views) Re: BAD PCM? Sign In The computer monitors the engine temp via the coolant sensor. When it sees a predetermined value, it completes the ground side of the fan relay coil. You should first check for voltage at two of the relay connectors with the key on. Then you should take the test light from battery positive and touch the remaining two terminals. At one the light should glow. This is ground. Start the car and test the remaining terminal with the test light connected to battery positive. You can even turn the A/C on. If the test light glows the PCM is fine. If the computer does not turn the light on when the engine temp guage gets to almost hot, you need to check the coolant temp sensor and the wire between the PCM and the fan relay for an open condition. An ohmmeter is the best way to do this. Let us know what you find. If I can remember I'll try to get you a PCM pinout chart for your car tomorrow. Steve (This post was edited by steve01832 on Nov 21, 2006, 6:01 PM) REYGS User Nov 22, 2006, 1:47 PM Post #3 of 3 (3237 views) Re: BAD PCM? Sign In Thaks for the advice. I will do. And yes the fan comes on with AC on. I will get back with you.   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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