Truck won’t start after sparking
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Joined: Feb 2017
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From: Port Saint lucie
Truck won’t start, BAD PCM?
I was fixing my coolant temp sensor wires just now, and they started sparking when they hit the alt. I disconnected the battery but unfortunately the terminals layed back onto the battery. Now the truck won’t start, and I’m getting “no link” in scanner. Pretty sure I burnt my ecm up...? Also the mileage says “no bus”
i checked all fuses only one that was blown was the “cluster” 10amp, replaced that and nothing still.
i checked all fuses only one that was blown was the “cluster” 10amp, replaced that and nothing still.
Last edited by Chunx89; Dec 21, 2018 at 04:36 PM.
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Very possible. If the coolant sensor wires touched the fat wire going from the alternator to the battery it did create an unfused +12V to ground (the sensor is read to ground). There are two fuses for the PCM, #3 under the hood and #9 in the inside panel. Also check the ECM ground wiring from the ECM to the front of the engine if a ground wire burned up.
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From: Clayton MI
The two-wire sensor comes from/goes to the PCM. It's a five volt reference signal the sensor modifies, for the PCM to read. If you shorted that to the alt output, chances are REAL good you smoked the PCM.
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From: Port Saint lucie
Yeah it’s what I thought, where do I go about getting a new one? I see some online that I give vin and mileage to and they mail it already plug and play? Any experience with them?
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From: Clayton MI
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From: Port Saint lucie
Old post but you don’t happen to remember the vendor do you? When I purchased this PCM it came with a lifetime warranty so possibility I bought it through that vendor!
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From: Clayton MI
I don't think they are a sponsor here any more... I don't see their ad at any rate. I don't remember their name..... Can you go back thru your payment records to see who you bought it from?