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 (DTC) can be set.
- If an open or shorted condition has developed in the relay circuit controlling the electric radiator fan, a DTC can be set.

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

ACCESSING DIAGNOSTIC TROUBLE CODES

To read DTCs and to obtain cooling system data, Testing and Inspection

ERASING TROUBLE CODES

Use a scan tool to erase DTCs after the problem has been repaired. Refer to the appropriate Powertrain Diagnostic Procedures service information for operation of the scan tool.