Conditions for Clearing I/M Test DTCs
- Only the OBD II System can erase the I/M Test DTC. The OBD II 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 out due to 3 passing drive cycles, 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, the DTC must PASS and not FAIL. 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.
- For the OBD II 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 is greater than 600 s.
- Cumulative vehicle operation above 41 kPa (25 mph) for over 300 s.
- Continuous vehicle idle for greater than 30 s.
- Turn ignition OFF for 5 s and allow the code to clear.