With Malfunction Indicator Light (MIL)

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.

Jumper Wire Installed Between Pin #2 And Self Test Input (STI):

3. ACTIVATE the self test by grounding the STI connector.
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, proceed with substep a. If any hard codes are received, proceed to SERVICE CODE CHARTS for the appropriate diagnostic path.
After completing the proper pinpoint test(s), return to this test and perform the KOEO test again. If no codes are received, go to pinpoint test QA, step QA1. QA1 - Check VREF Voltage At Self-Test Connector
a. IF THE CHECK ENGINE LIGHT IS ON:
Refer to the appropriate continuous memory code chart before addressing any other symptoms.
b. IF ENGINE RUNS OR IDLES ROUGH:
Continue with substep c for DIS or EDIS vehicles or go to pinpoint test S, step S1 for a TFI equipped vehicle. S1 - ISC-BPA Check
c. IF CONTINUOUS MEMORY FAULT CODES 45, 46, 215, 216, 217, 232, OR 238 WERE RECEIVED DURING KOEO SELF TEST:
Go to IGNITION SYSTEMS for diagnostics.
IF THESE CODES WERE NOT RECEIVED:
Go to pinpoint test S, step S2. S2 - Check For RPM Drop
d. IF NONE OF THE ABOVE SITUATIONS ARE PRESENT:
Perform computed timing check. 3.1-4.0 - Check for Codes/Computed Timing Check