Clearing Trouble Codes
CLEARING CODESAssembly Line Diagnostic Connector (ALDL).:
When a code or flag is set the PCM stores it in two tables: General Information and Malfunction History.
- When clearing codes from General Information without a Scan tool you will need to have the ignition "ON" and ground the ALDL connector terminals A to B three times within five seconds.
- General Information can also be cleared with 50 ignition "ON" cycles.
- Malfunction (MALF) history can be cleared only with a Scan tool.
NOTE: Disconnecting power to the PCM has no effect on stored codes or flags in MALF history, but will clear codes and flags in general information.