Computed Timing Check
Turn ignition off, and wait 10 seconds. Using jumper wire or test equipment, activate KOER SELF-TEST. Start engine, and check:
- If engine starts and stalls, or stalls during self-test, go to TEST S.
- If Code 98 or 998 is displayed, EEC-IV system is operating in Failure Mode Effects Management (FMEM). Vehicle cannot be diagnosed in KOER SELF-TEST. Rerun KOEO SELF-TEST.
- Check computed timing after last service code has been displayed. Timing will remain fixed for 2 minutes after last code has been retrieved unless self-test is deactivated.
- Computed timing at crankshaft should equal base timing (10 degrees BTDC) plus 20 degrees BTDC. This timing may vary 3 degrees. If computed timing is within specification, perform KOER SELF-TEST. If timing is not within specification, go to TEST P, step 2).