PERMANENT DTC

The permanent DTC (PDTC) is set in the non-volatile memory of the ECM as the permanent status, which checks that the malfunction of the emission related components/the system has not been repaired yet. When detecting the malfunction necessary to illuminate the malfunction indicator lamp (SERVICE ENGINE SOON or check engine lamp), the ECM illuminates the MIL and sets the appropriate DTC as the PDTC in the non-volatile memory concurrently. The usual DTC is set in the non-volatile memory aside from this. The ECM can store up to six PDTCs. The ECM, therefore, cannot store the seventh and subsequent PDTCs. If the temporary malfunction causes the malfunction indicator lamp to be illuminated and then the reinstatement during the subsequent driving causes it to be extinguished, the PDTC is erased. Also if the ECM checks that the DTC malfunction is fixed during the driving after the DTC repair is completed, the PDTC is erased. The PDTC, however, is not erased by disconnecting the 12V battery terminal or erasing with the scan tool (M.U.T.-III SE). If must be erased while the vehicle is repaired, the PDTC can be erased by the procedures shown below. If must be erased because of the failure to pass the Inspection and Maintenance (I/M) test, the PDTC can also be erased by the following procedure:

Procedures for Erasing Permanent DTC

1. Check that the DTC is not set. If the DTC is set, perform the DTC troubleshooting, then repair the DTC.

2. Carry out the Step 2 to 9 of DRIVE CYCLE PATTERN 3 (Refer to OBD-II DRIVE CYCLE for the drive cycle pattern). However, when deleting the DTC P00FE-00, P011B-00, P040F-00, P043E-00, P043F-00, P0451-00, P0454-00, P04E0-00, P04EC-00, P04ED-00, P04EE-00, P04EF-00, P1401-09, P1450-72, P1451-73, P1469-62, P2450-00, P2451-00, P24B9-00, P24C0-00, P24C1-00, P24D6-00 or P24D9-00 carry out the Step 2 to 11 of DRIVE CYCLE PATTERN 4 (Refer to OBD-II DRIVE CYCLE for the drive cycle pattern). when deleting the DTC P0010-00, P0011-00, P0111-00, P0133-00, P0139-00, P0140-00, P014C-00, P014D-00, P015A-00, P015B-00, P0335-00, P0400-00, P0402-00, P0450-00 or P219A-00, carry out the Step 2 to 12 of DRIVE CYCLE PATTERN 5 (Refer to OBD-II DRIVE CYCLE for the drive cycle pattern).

3. Check that the PDTC is erased. If the PDTC is not erased, check the DTC or the provisional diagnostic trouble code. If the malfunction code is set, repair the DTC. Try to erase the PDTC again (from Step 1 to 2). If the malfunction code is not set, the drive cycle pattern (Step 2) monitoring the malfunction can possibly be insufficient.