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 SERVICE CODE REFERENCE CHARTS. 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 SERVICE CODE REFERENCE CHARTS before addressing any other symptoms.
• On all vehicles, except vehicles with Distributorless Ignition System (DIS), if engine runs or idles rough, go to TEST S step 2). On vehicles with DIS, use recorded Continuous Memory Codes and appropriate chart under SERVICE CODE REFERENCE CHARTS.
• On DIS vehicles, perform only the following. If Continuous Memory Codes 45, 46, 48, 215, 216, 217, 232 or 238 are received during KOEO SELF-TEST, see appropriate system in SYSTEM/COMPONENT TESTS article. If Codes 45, 46, 48, 215, 216, 217, 232 or 238 were not received, 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.