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How to Erase Emission-Related Diagnostic Information

How to Erase Emission-Related Diagnostic Information

How to Erase DTC and 1st Trip DTC

With SDT

NOTE:
- If the ignition switch stays ON after repair work, be sure to turn ignition OFF once. Wait at least 10 seconds and then turn it ON (engine stopped) again.
- If the DTC is not for A/T related items (see [DTC Index: ECM]), Diagnostic Trouble Code Descriptions skip step 1.

1. Erase DTC in TCM. Refer to [OBD-II Diagnostic Trouble Code (DTC)].OBD-II Diagnostic Trouble Code (DTC)
2. Select "Engine / Powertrain" with SDT.
3. Select "DTC check".
4. Touch "Clear". (DTC in ECM will be erased.)

With GST

NOTE:
- If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10 seconds and then turn it ON (engine stopped) again.

1. Select Service $04 with GST (Generic Scan Tool).

No Tools

NOTE:
- If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once.
Wait at least 10 seconds and then turn it ON (engine stopped) again.

1. Erase DTC in TCM. Refer to [OBD-II Diagnostic Trouble Code (DTC)].OBD-II Diagnostic Trouble Code (DTC)
2. Change the diagnostic test mode from Mode II to Mode I by depressing the accelerator pedal.

- If the battery is disconnected, the emission-related diagnostic information will be lost within 24 hours.
- The following data are cleared when the ECM memory is erased.
- Diagnostic trouble codes
- 1st trip diagnostic trouble codes
- Freeze frame data
- 1st trip freeze frame data
- System readiness test (SRT) codes
- Test values

Actual work procedures are explained using a DTC as an example. Be careful so that not only the DTC, but all of the data listed above, are cleared from the ECM memory during work procedures.

How to Erase Permanent DTC

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.






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






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 [Emission-related Diagnostic Information], Emission-Related Diagnostic Information "How to Display Permanent DTC Status".
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 [Emission-related Diagnostic Information], Emission-Related Diagnostic Information "How to Display Permanent DTC Status".
12. Check that the permanent DTCs have been erased.

Group B






Note: When experiencing both driving pattern B and D during the same trip, the experience of driving pattern D is counted by priority.

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 [Emission-related Diagnostic Information], Emission-Related Diagnostic Information "How to Display Permanent DTC Status".
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. 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 [Emission-related Diagnostic Information], Emission-Related Diagnostic Information "How to Display Permanent DTC Status".
18. Check that the permanent DTCs have been erased.
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