KOEO Self-Test

WARNING: This page is about a different car, the 1994 Mazda Navajo. However, it is still accessible from the selected car via links, so may be relevant.

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:

DO NOT depress throttle.
On vehicles with Brake On-Off (BOO) 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 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 codes and Continuous Memory Codes.

If PCM will not output codes, go to CIRCUIT TEST QA.
If codes are outputted, repair codes in the order displayed. See SERVICE CODE REFERENCE.
If vehicle has a no-start condition, go to CIRCUIT TEST AC (4.0L).
If vehicle displays Code 111 (pass code), go to KOER SELF-TEST.