Without Scan Tool

Self Diagnostic System:

When problems occur in ECU monitored input or output devices, test the system to find the cause. During testing, failures of input and output devices are retrieved from the ECU as malfunction code numbers and displayed on the dash mounted malfunction indicator light (MIL).

NOTE: The ECU continuously checks for input device malfunctions. However, it only checks for output device malfunctions in a 3 second period after the ignition switch is turned "ON" with test connector grounded. If there is more than one malfunction code present, the lowest number code is displayed first, followed by subsequent codes in numerical order.

INSPECTION PROCEDURE

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

Grounding Test Connector Pin:

2. Ground test connector (Green: 1-pin) with a jumper wire.
3. Turn ignition switch "ON."
4. If MIL illuminates, goes off, and stays off, no codes are present.
5. If MIL light illuminates, goes off, and then starts flashing, codes are present.
6. Start engine and check for additional codes.
7. If any codes are retrieved, refer to Malfunction Code Charts under DIAGNOSTIC CHARTS. Repair as required.

AFTER REPAIR PROCEDURE

1. Erase ECU malfunction code memory by disconnecting the negative battery cable and depressing the brake pedal for at least five seconds. Reconnect battery cable.
2. Ensure engine is at operating temperature. Ground test connector.
3. Turn ignition switch "ON."
4. If MIL light illuminates, goes off, and stays off, no codes are present.
5. If MIL illuminates, goes off, and then starts flashing, codes are present.
6. Start engine and check for additional codes.
7. If any codes are retrieved, repair problem and repeat after-repair procedure.