Nissan Versa

 Sedan Service Manual

Engine » Engine control system (EC) » Diagnosis description
Diagnosis description : permanent diagnostic trouble code (permanent DTC)

Permanent DTC is defined in SAE J1979/ISO 150315 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 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 manual.

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 SET TIMING

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

Diagnosis description : 1st trip detection logic and two trip detection logic

Diagnosis description : dtc and freeze frame data

Diagnosis description : counter system

Diagnosis description : driving pattern

Diagnosis description : system readiness test (SRT) code

Diagnosis description : permanent diagnostic trouble code (permanent DTC)

Diagnosis description : malfunction indicator lamp (MIL)

On Board Diagnosis Function

Consult function