Without Scan Tool

Self Diagnostic System:

When problems occur in PCME monitored input or output devices, the dash mounted malfunction indicator lamp (MIL) will light ("CHECK"), and stay ON while faults are present and the engine is running. Codes stored in computer memory identify the faulty circuit or component. The following describes the procedure for displaying codes stored in the self diagnostic memory.

During this test procedure, the PCME will display input and output device failure codes by flashing the MIL lamp on the instrument panel.

NOTE: The PCME continuously checks for input device malfunctions. However, it only checks for output device malfunctions during a 3 second period after the ignition switch is turned ON with TEN terminal of data link connector grounded. If more than one failure code is present, the lowest number code is displayed first. Subsequent codes are displayed in numerical order.

INSPECTION PROCEDURE

1. Warm engine to operating temperature and switch ignition "OFF."

Diagnostic Connector:

2. Bridge the "TEN" and "GND" terminals of data link connector.
3. Turn ignition switch "ON."
4. If the MIL lamp illuminates ("CHECK") for approximately 3 seconds and then goes "OFF" and stays "OFF," no codes are present.
5. If the MIL lamp illuminates ("CHECK"), goes "OFF" and then starts flashing, codes are present.
6. Start the engine and check for additional codes.
7. If codes are present, note code numbers and check for causes.

AFTER REPAIR PROCEDURE

1. Erase codes from PCME memory by disconnecting the negative battery cable and depressing the brake pedal for at least twenty seconds. Reconnect battery cable.
2. Test drive vehicle at more than 25 mph (40 kph) for at least 10 seconds. Stop and turn engine off.
3. Repeat inspection procedure from step 2.
4. If the MIL light illuminates ("CHECK") for approximately 3 seconds and then goes "OFF" and stays "OFF," no codes are present.
5. If the MIL light illuminates ("CHECK"), goes "OFF" and then starts flashing, codes are present.
6. Start the engine and check for additional codes.
7. If the same codes recur, recheck all work and look for other possible causes (intermittent?)
8. If any new codes are retrieved, repeat step 7 of inspection procedure (above). If the same code(s) recurs, recheck repair work and look for what else might cause the code(s).