Code 14: Coolant Temp Sensor (Cts) Shorted

WARNING: This page does not describe the selected car, but rather 28 other vehicles, including the 1984 Pontiac Phoenix, 1984 Pontiac Parisienne, 1984 Pontiac Grand Prix, 1984 Pontiac Firebird, and 1984 Pontiac Bonneville. However, it is still accessible from the selected car via links, so may be relevant.

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

NOTE: The following step numbers refer to the numbers in the accompanying flow chart(s).

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.
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 Flow Chart

Fig 2: Code 14: Coolant Sensor Shorted Flow Chart