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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Controls And Fuel - 2.4L - DTC P0628 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Inspection/Maintenance System Check >> Conditions for Clearing I/M Test DTCs

Conditions for Clearing I/M Test DTCs

WARNING: This page is about a different variant/trim than selected.
  1. Only the OBDII System can erase I/M Test DTCs. The OBDII system must determine that the malfunction that caused the I/M Test DTC to be stored is no longer present and is not commanding the MIL. Each of the following represents ways to clear an I/M Test DTC:
    • If the MIL goes off due to 3 passing drive cycles, and the scan tool code clear is not used, the I/M Test DTC is erased at power down of the last drive cycle.
    • If a scan tool code clear is used to turn OFF the MIL, the I/M Test DTC is not erased, therefore the DTC must PASS and not FAIL during the drive cycle. The I/M Test DTC is erased at power down of the drive cycle.
    • If the controller is reflashed/reprogrammed, all I/M Test DTCs are erased.
  2. For the OBDII System to run a single drive cycle for clearing an I/M Test DTC, all of the following conditions must occur:
    • Cumulative time of engine run time greater than 600s.
    • Cumulative vehicle operation above 40 km/h (25 mph) over 300s.
    • Continuous vehicle idle greater than 30s.
    • Ignition OFF for 5s to allow the code to clear.
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