KOEO & KOER On-Demand Self-Test Codes

Record DTCs in order received. These DTCs indicate current faults in system and should be serviced in the same order it was set.

NOTE: If self-test will not activate or TOOL COMMUNICATION ERROR is received, go to TEST QA: UNABLE TO ACTIVATE SELF-TEST/SCP COMMUNICATION ERROR DTC NOT LISTED under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE article in ENGINE PERFORMANCE.