KOER Self-Test
DO NOT enter this test sequence until a Code 111 (pass code) has been retrieved in KOEO SELF-TEST. If system has not passed KOEO SELF-TEST, codes recorded in KOER SELF-TEST may not be valid.
Deactivate self-test by removing and reconnecting jumper wire or by procedure specified by test equipment in use. Start engine, and run it for 2 minutes at 2000 RPM to warm Heated Exhaust Gas Oxygen (HEGO) sensor. Turn engine off, and wait 10 seconds. Activate KOER SELF-TEST using a jumper wire or appropriate procedure for test equipment used. Start engine. Record all DTCs displayed. Check following items:
- If engine starts and stalls (or stalls during self-test), go to CIRCUIT TESTS. See appropriate TESTS W/CODES article in ENGINE PERFORMANCE.
- If vehicle is equipped with a Brake On-Off (BOO) switch, brake pedal must be depressed and released after ID code portion of test.
- If Dynamic Response Code appears, perform a brief Wide Open Throttle (WOT). DO NOT perform WOT unless requested.
- If a Code 111 (pass code) is retrieved during KOER SELF-TEST, service Continuous Memory Codes retrieved in KOEO SELF-TEST. See appropriate TESTS W/CODES - EEC-IV article in ENGINE PERFORMANCE.
- If a Code 111 (pass code) is retrieved during Continuous Memory Code portion of KOEO SELF-TEST (Code 111-1-111) and no driveability problem exists, EEC-IV testing is complete. If driveability problems are still present, go to TROUBLE SHOOTING in AUTO TRANS OVERHAUL - FORD 4R44E & 4R55E article.
- If KOER codes are present, see EEC-IV CODE REFERENCE TABLE . If system will not output codes, go to CIRCUIT TEST QA. See appropriate TESTS W/CODES article in ENGINE PERFORMANCE: