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 an open or shorted condition has developed in the relay circuit controlling the electric radiator fan, 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. Emissions Control - Description.



ACCESSING DIAGNOSTIC TROUBLE CODES


To read DTC's and to obtain cooling system data, Emissions Control - Description.



ERASING TROUBLE CODES


After the problem has been repaired, use the scan tool to erase a DTC.