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 CODE-TO-TEST REFERENCE MENUS  . 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. Refer to DIAGNOSTIC CODE-TO-TEST REFERENCE MENUS  .
• On distributorless ignition models, see IGNITION SYSTEM in SYSTEM/COMPONENT TESTS - EEC-IV (4.6L) article in this section if Continuous Memory Code 215, 216, 217, 218, 222, 223, 224, 232 or 238 is retrieved during KOEO SELF-TEST.
• If vehicle has a no-start condition, proceed to: CIRCUIT TEST AA (Distributor Ignition System) or CIRCUIT TEST AC (Electronic Ignition - 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 below.