Reading and Clearing Diagnostic Trouble Codes

ECM

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. 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. Diagnosis Description.
12. Check that the permanent DTCs have been erased.

Group B











NOTE:
- Drive the vehicle according to only driving patterns indicating "INCMP" in driving patterns B and D on the "PERMANENT DTC STATUS" screen.
- 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. 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. Diagnosis Description.
18. Check that the permanent DTCs have been erased.

DRIVING PATTERN

Driving Pattern B
Driving pattern B means a trip satisfying the following conditions.
- Engine speed reaches 400 rpm or more.
- Water temperature reaches 70�C (158�F) ore more.
- Vehicle speed of 70 - 120 km/h (44 - 75 MPH) is maintained for 60 seconds or more under the control of closed loop.
- Vehicle speed of 30 - 60 km/h (19 - 37 MPH) is maintained for 10 seconds or more under the control of closed loop.
- Under the closed loop control condition, the following state reaches 12 seconds or more in total: Vehicle speed of 4 km/h (2 MPH) or less with idling condition.
- The state of driving at 10 km/h (7 MPH) or more reaches 10 minutes or more in total.
- A lapse of 22 minutes or more after engine start.

CAUTION:
Always drive at a safe speed.

NOTE:
- Drive the vehicle at a constant velocity.
- When the same malfunction is detected regardless of driving conditions, reset the counter of driving pattern B.
- When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving pattern B.

Driving Pattern D
Driving pattern D means operating vehicle as per the following.
- The state of driving at 40 km/h (25 MPH) reaches 300 seconds or more in total.
- Idle speed lasts 30 seconds or more.
- A lapse of 600 seconds or more after engine start.

CAUTION:
Always drive at a safe speed.

NOTE:
- When the same malfunction is detected regardless of driving conditions, reset the counter of driving pattern D.
- When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving pattern D.