benphillips

1997 f150 5.4

I am getting ~12v at the ect sensor connector with the sensor unplugged.

I have preformed test bellow and replaced the sensor as it said to do.

My coolant sensor is receiving ~12v and at ~80 degrees F is sending out ~8v.

My temp gauge is pegged. It falls when unplugging the sensor or turning off the ignition.

Should the sensor be receiving 5v instead of 12v?




TEMPERATURE GAUGE INACCURATE
1. Disconnect Sensor - Ensure temperature sensor connector is in good condition. Turn ignition off.
Disconnect coolant temperature sensor. Turn ignition off. If temperature gauge indicates cold, go to next
step. If temperature gauge does not indicate cold, go to step 3).
2. Bypass Temperature Sensor - Connect a jumper wire between the 2 pins of temperature sensor harness
connector. If temperature gauge indicates hot, replace coolant temperature sensor. If temperature gauge
does not indicate hot, go to next step.
3. Check Red/White Wire For Short To Ground - Turn ignition off. Disconnect instrument cluster
harness connector C237. Measure resistance between instrument cluster harness connector C237 pin No.
9 (Red/White wire) and ground. If resistance is greater than 10 k/ohms, repair/replace instrument cluster.
If resistance is less than 10 k/ohms, repair short to ground in Red/White wire. Check gauge operation.
4. Check Red/White Wire & Pink/Orange Wire For Open - Turn ignition off. Disconnect instrument
cluster harness connector C237. Measure resistance between C237 pin No. 9 (Red/White wire) and pin
No. 5 (Pink/Orange wire). If resistance is less than 5 ohms, repair/replace instrument cluster. If resistance
is greater than 5 ohms, repair open Red/White or Pink/Orange wire.

benphillips

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