Code 14 - Coolant Sensor Shorted

Code 14 means the ECM has seen low resistance of the coolant sensor circuit as high engine temperature, or low voltage at ECM terminal "3", for a time longer than specified.

1. This test determines whether fault is in sensor or circuit. Normal circuit voltage is about 5 volts.
   NOTE: Coolant sensor IS NOT connected during this test.
2. Checks for ground between ECM and coolant sensor. Test light to battery positive will be "OFF" in an ungrounded circuit.

Fig 1: Code 14, Coolant Sensor Shorted