KOEO Self-Test

WARNING: This page is about a different car, the 1995 Ford Aerostar. However, it is still accessible from the selected car via links, so may be relevant.

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, perform the following:

If MIL/CHECK ENGINE light is on, service diagnostic trouble codes in order retrieved. Proceed to 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 SYSTEMS in SYSTEM/COMPONENT TESTS - EEC-IV (3.0L) article in the ENGINE PERFORMANCE section.
If vehicle has a no-start condition, go to CIRCUIT TEST AA (distributor ignition).
If vehicle displays a Code 111 (pass code) and does not have any symptoms described in previous steps, go to KOER SELF-TEST .