KOEO Self-Test

Ensure engine is warmed to normal operating temperature. If engine does not start (or stalls after starting), continue KOEO SELF-TEST  . DO NOT  depress throttle. Turn ignition off. Ensure test equipment is properly attached. Turn ignition on (engine off). Record all KOEO and Continuous Memory Codes.

If a Code 111 (pass code) is not retrieved, service KOEO codes. See DIAGNOSTIC TROUBLE CODE REFERENCE CHARTS  . If PCM will not output codes, go to CIRCUIT TEST QA  . If diagnostic trouble codes are retrieved:

• If MIL/CHECK ENGINE light is on, service diagnostic trouble codes in order retrieved. See DIAGNOSTIC TROUBLE CODE REFERENCE CHARTS  .
• If Continuous Memory Code 215, 216, 217, 218, 222, 224, 232 or 238 is retrieved during KOEO SELF-TEST, see IGNITION SYSTEM in the SYSTEM/COMPONENT TESTS article.
• If vehicle has a no-start condition, go to CIRCUIT TEST AA (DI), CIRCUIT TEST AB (EI - low data rate) or CIRCUIT TEST AC  (EI - high data rate).
• If vehicle displays a Code 111 (pass code) and does not have any symptoms described in previous steps, go to KOER SELF-TEST  .