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I have a 2005 Eddie Bauer Explorer, with the 4.6L V8. Recently an intermittent problem developed where the temperature gauge drops all the way below COLD, then a "Check Gauge" light comes on, then about 15 seconds later, the "Check Engine" light comes on. When pulling the code, I get a P0192, which indicates it is in the Cylinder Head Temp Sensor circuit.
I've had the temp sensor replaced twice, the pigtail connector to the sensor replaced, the thermostat replaced and the coolant system flushed, and the problem persists. When I first start the engine, the gauge registers cold (as it should), then will slowly warm up to where it is about half way between cold and hot. It will stay there for anywhere from 1-2 minutes to 30 minutes, then suddenly drop below cold with the lights indicating as stated above. Sometimes, as I drive, it will "recover" and start working normally again, only to drop again a while later.
I am thinking I have a wire that is either intermittently open or shorting between the temp sensor and the PCM that is causing the problem. I had a shop check the instrument cluster, and everything checked out ok. They think it may be the PCM itself, but want a fortune to replace/reprogram it. My though it to first replace the wiring between the sensor and the PCM, but I need to figure out which wire it is on the PCM connector as everything is still wrapped in the wiring harness. Does anyone know where i can get a copy of a wiring diagram for this vehicle? Is there a way to test the PCM before replacing it?
I've had the temp sensor replaced twice, the pigtail connector to the sensor replaced, the thermostat replaced and the coolant system flushed, and the problem persists. When I first start the engine, the gauge registers cold (as it should), then will slowly warm up to where it is about half way between cold and hot. It will stay there for anywhere from 1-2 minutes to 30 minutes, then suddenly drop below cold with the lights indicating as stated above. Sometimes, as I drive, it will "recover" and start working normally again, only to drop again a while later.
I am thinking I have a wire that is either intermittently open or shorting between the temp sensor and the PCM that is causing the problem. I had a shop check the instrument cluster, and everything checked out ok. They think it may be the PCM itself, but want a fortune to replace/reprogram it. My though it to first replace the wiring between the sensor and the PCM, but I need to figure out which wire it is on the PCM connector as everything is still wrapped in the wiring harness. Does anyone know where i can get a copy of a wiring diagram for this vehicle? Is there a way to test the PCM before replacing it?