With Scan Tool

NOTE: It may be necessary to service non-EEC-IV faults before running the quick test.

Continuous codes recorded in this step will be used for diagnosis in ADDRESS CONTINUOUS MEMORY DTC after a pass code is received in both Key On Engine Off (KOEO) and Key On Engine Running (KOER) self-tests.

Deviation from this procedure may cause false codes to be output.

1. START engine and bring to normal operating temperature.
NOTE: If engine will not start or stalls after starting, proceed with the Key On Engine Off (KOEO) self test.
2. Turn the key OFF, then wait ten seconds.
3. ACTIVATE the self test (refer to scan tool manual for instructions).
4. Turn the ignition key to the ON position.
5. Record all codes received.
6. Turn the ignition key OFF and DEACTIVATE the self test.
7. If a pass code (11 or 111) is received for hard codes (11/111-10-any code), proceed with Base Timing Check. Ignition Timing
If any hard codes are received, refer to the appropriate diagnostic trouble code chart for diagnostic path. Manufacturer Code Charts