Permanent Diagnostic Trouble Code (Permanent DTC): Notes

Permanent DTC is defined in SAE J1979/ISO 15031-5 Service $0A.

ECM stores a DTC issuing a command of turning on MIL as a permanent DTC and keeps storing the DTC as a permanent DTC until ECM judges that there is no presence of malfunction.

Permanent DTCs cannot be erased by using the erase function of M.U.T.-III SE or Generic Scan Tool (GST) and by disconnecting the battery to shut off power to ECM. This prevents a vehicle from passing the in-use inspection without repairing a malfunctioning part.

When not passing the in-use inspection due to more than one permanent DTC, permanent DTCs should be erased, referring to this Service Information.

NOTE:

The important items in in-use inspection are that MIL is not ON, SRT test items are set, and permanent DTCs are not included .
Permanent DTCs do not apply for regions that permanent DTCs are not regulated by law .