KOEO Self-Test

Start engine and allow to idle until vehicle reaches operating temperature. If engine does not start or stalls after starting, continue KOEO SELF-TEST. DO NOT depress throttle on gasoline-engine vehicles. Turn ignition off and wait 10 seconds. Activate self-test procedure by using a jumper wire or appropriate test equipment. Turn ignition on, leaving engine off. Record all KOEO and Continuous Memory Codes.

If a Code 11 or 111 (pass code) is not received in the KOEO portion of the test, service the KOEO codes. See appropriate chart under the KOEO, KOER or CONTINUOUS CODE/TEST MENU tables. If the ECA will not output codes, go to TEST QA, step 1). If service codes are received, check the following procedures:

• If CHECK ENGINE or SERVICE ENGINE SOON light is on when vehicle arrived for service, use recorded Continuous Memory Codes and appropriate chart under the KOEO, KOER or CONTINUOUS CODE/TEST MENU tables before addressing any other symptoms.
• If engine runs or idles rough, go to TEST S step 2).
• If vehicle has a no-start condition, go to TEST A, step 1).
• If vehicle displays a Code 11 or 111 (pass code) and does not have any of the symptoms described in previous steps, go to COMPUTED TIMING CHECK.