Cutlass L4-138 2.3L VIN A FI HP (1990)
On-Board Diagnostic Mode Trouble Code Descriptions
Trouble Code Descriptions
The C68 air conditioning is equipped with an on-hoard diagnostic feature which allows the Heater and A/C Control Assembly to detect certain system
faults. The diagnostic feature can also he used to display certain data parameters. If the Heater and A/C Control Assembly detects a fault in the system ,
the C or F annunciator will flash during the first two minutes of vehicle operation.
Entry into the diagnostic mode is gained by depressing the "OUTS TEMP" and "BI-LEVEL" buttons at the same time. Once the diagnostic mode is
entered any trouble codes stored will he displayed, if none are present 00 will be displayed.
If the warm button is depressed after the trouble codes have been displayed, the data mode will be entered. The information available in the data mode is
displayed in units used by the computer which may not be of use in observing the system. To exit the diagnostic mode, press any mode button.
With Manual A/C
