Permanent Diagnostic Trouble Code (Permanent DTC)

WARNING: This page is about a different variant/trim than selected.

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 CONSULT-III or Generic Scan Tool (GST) and by disconnecting the battery to shut off power to ECM. This prevents a vehicle from passing the state emission inspection without repairing a malfunctioning part.

When not passing the state emission inspection due to more than one permanent DTC, permanent DTCs should be erased, referring to this service information.

NOTE:

The important items in state emission 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.

Permanent DTC Item

For permanent DTC items, MIL turns ON. Refer to "EMISSION-RELATED DIAGNOSTIC INFORMATION ", "EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS ".

Permanent DTC Set Timing

The setting timing of permanent DTC is stored in ECM with the lighting of MIL when a DTC is confirmed.

Permanent DTC Service Procedure

Fig 1: DTC Flow Chart

Courtesy of NISSAN MOTOR CO., U.S.A.

How to Display Permanent DTC Status

WITH CONSULT-III

Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON.
Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON.
Select "PERMANENT DTC STATUS" in "DTC & SRT CONFIRMATION" mode with CONSULT-III.
NOTE: Permanent DTCs stored in ECM memory are displayed on the CONSULT-III screen to show if a driving pattern required for erasing permanent DTCs is complete (CMPLT) or incomplete (INCMP).

CAUTION: Since the "PERMANENT DTC STATUS" screen displays the previous trip information, repeat the following twice to update the information: "Ignition switch OFF", "Wait for more than 10 seconds" and "Ignition switch ON".

Fig 2: Screen Display - PERMANENT DTC STATUS
Courtesy of NISSAN MOTOR CO., U.S.A.

WITH GST

Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON.
Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON.
Select Service $0A with GST (Generic Scan Tool).