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 CONTINUOUS MEMORY CODES after a pass code is received in both Key On Engine Off (KOEO) and Engine Running (ER) 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.

NOTE: For remainder of the test procedure depress the accelerator pedal.

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 next step. Key ON Engine Running (KOER) Self-Test

If any hard codes are received, refer to the appropriate service code chart for diagnostic path. Manufacturer Code Charts

If no codes are received, go to pinpoint test QA, step QA1. QA1 - Check VREF Voltage At Self-Test Connector

After completing the proper pinpoint test(s), return to this test and perform the KOEO test again.