KOEO Self-Test

Ensure engine is at normal operating temperature. If engine does not start (or stalls after starting), continue KOEO SELF-TEST.

Perform the following step(s) as applicable:

• On gasoline vehicles, DO NOT  depress throttle.
• On vehicles with Brake On/Off circuit, apply and release brake pedal after vehicle ID code is given.
• On vehicles with Power Steering Pressure (PSP) switch, turn steering wheel 1/2 turn and release after vehicle ID code is given.
• On vehicles with Transmission Control Switch (TCS), cycle TCS switch after vehicle ID code is given.

Turn ignition off. Wait 10 seconds. Ensure test equipment is properly attached. Turn ignition on (engine off). Record all KOEO and Continuous Memory Codes.

If a Code 11 or 111 (pass code) is not retrieved, service KOEO codes. See SERVICE CODE REFERENCE CHARTS  . If PCM will not output codes, go to CIRCUIT TEST QA. If service codes are retrieved:

• Service codes in the order they are retrieved. Refer to the SERVICE CODE REFERENCE CHARTS  .
• If vehicle has a no-start condition, go to CIRCUIT TEST AC (EDIS - High Data Rate).
• If vehicle displays a Code 11 or 111 (pass code), go to KOER SELF-TEST.