Verifying Repairs: Notes

Procedure for verifying repairs depends on scan tool functions and whether DTC is set by one-trip or two-trip fault detection logic. The two-trip fault detection logic requires fault to be detected on 2 consecutive drive cycles, with each meeting the code set criteria, before DTC will set and MIL will illuminate. DTCs using the one-trip fault detection logic will set the first time fault is detected. If fault is emissions related, PCM will also turn on MIL. Most DTCs use two-trip; fault detection logic. To determine which logic is used to set DTC, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  , then go to appropriate repair verification procedure.