How to Erase Permanent DTC: Notes

When a DTC is stored in ECM

When a DTC is stored in ECM and MIL is ON, a permanent DTC is erased with MIL shutoff if the same malfunction is not detected after performing the driving pattern for MIL shutoff three times in a raw.

Fig 1: MIL Driving Pattern

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When a DTC is not stored in ECM

The erasing method depends on a permanent DTC stored in ECM. Refer to the following table.

Group A

Fig 2: MIL Driving Pattern (Group A)

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1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Check permanent DTC. Refer to "DIAGNOSIS DESCRIPTION ".
6. Perform "DTC CONFIRMATION PROCEDURE" for DTCs which are the same as permanent DTCs stored in ECM.
7. Turn ignition switch OFF and wait at least 10 seconds.
8. Turn ignition switch ON.
9. Turn ignition switch OFF and wait at least 10 seconds.
10. Turn ignition switch ON.
11. Check permanent DTC. Refer to "DIAGNOSIS DESCRIPTION ".
12. Check that the permanent DTCs have been erased.

Group B

Fig 3: MIL Driving Pattern (Group B)

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1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Check permanent DTC. Refer to "DIAGNOSIS DESCRIPTION ".
6. Start engine and warm it up to normal operating temperature.
7. Drive the vehicle according to driving pattern D.
   CAUTION:

   • Always drive at a safe speed.
   • Never erase self-diagnosis results.
   • If self-diagnosis results are erased during the trip of driving pattern B or D, the counter of driving pattern B or D is reset.
   • If self-diagnosis results are erased during the trip of driving pattern B or D, an experience of driving pattern B and D during the same trip is not counted up.
8. Turn ignition switch OFF and wait at least 10 seconds.
9. Turn ignition switch ON.
10. Turn ignition switch OFF and wait at least 10 seconds.
11. Turn ignition switch ON.
12. Use "PERMANENT DTC WORK SUPPORT" to drive the vehicle according to driving pattern B.
    CAUTION:

    • Always drive at a safe speed.
    • Never erase self-diagnosis results.
    • If self-diagnosis results are erased during the trip of driving pattern B or D, the counter of driving pattern B or D is reset.
    • If self-diagnosis results are erased during the trip of driving pattern B or D, an experience of driving pattern B and D during the same trip is not counted up.
13. Turn ignition switch OFF and wait at least 10 seconds.
14. Turn ignition switch ON.
15. Turn ignition switch OFF and wait at least 10 seconds.
16. Turn ignition switch ON.
17. Check permanent DTC. Refer to "DIAGNOSIS DESCRIPTION ".
18. Check that the permanent DTCs have been erased.