On-Board Diagnostics (OBD)

ON-BOARD DIAGNOSTICS (OBD)

COOLING SYSTEM RELATED DIAGNOSTICS


The powertrain control module (PCM) has been programmed to monitor certain cooling system components:

- If the engine has remained cool for too long a period, such as with a stuck open thermostat, a Diagnostic Trouble Code (DTC) can be set.

If the problem is sensed in a monitored circuit often enough to indicated an actual problem, a DTC is stored. The DTC will be stored in the PCM memory for eventual display to the service technician.


ACCESSING DIAGNOSTIC TROUBLE CODES


To read DTC's and to obtain cooling system data, Refer to EMISSIONS CONTROL/ON-BOARD DIAGNOSTICS - OPERATION.


ERASING TROUBLE CODES


After the problem has been repaired, use the scan tool to erase a DTC. Refer to the appropriate Powertrain Diagnostic Procedures service information for operation of the scan tool.