B1422

Engine coolant temperature sensor shorted to battery positive

Fault symptom
The temperature sensor always indicates a cold engine.

Conditions
B1422: The PWM output for controlling the engine temperature gauge in main instrument display panel 1 is short-circuited to battery positive.
B1417: The PWM output which supplies engine temperature information to main instrument display panel 2 is short-circuited to battery positive.

Diagnostic procedure
1 Check that no diagnostic trouble codes are stored in the main instrument display panel. If trouble code are present, see "Main instrument display panel". Testing and Inspection
2 Connect a BOB and check the wiring for a short circuit to (+) between:
- Integrated Central Electronics (ICE) module connector pin 61 and pin 4 of the main instrument display panel 1 connector.
- ICE module connector pin 14 and pin 7 of the main instrument display panel 2 connector.
3 Clear the diagnostic trouble code, start the engine and check that the trouble code is not generated afresh.
4 If the trouble code is generated afresh, proceed to "Before Changing an Electronic Control Module".