Nissan Versa (N17): P0979 Shift solenoid C

DTC Logic

DTC DETECTION LOGIC

DTC	Trouble diagnosis name	DTC detection condition	Possible causes
P0979	Shift Solenoid C Control Circuit Low	The following diagnosis conditions are met, and the current monitor reading of the TCM 2-4 brake solenoid valve is 200 mA or less continuously for 0.5 seconds or more. - Diagnosis condition - Solenoid valve output current: 750 mA or more - GND short circuit diagnosis occurs in the solenoid valve drive circuit. - TCM power supply voltage: 10 V < TCM power supply voltage < 16 V	- Harness or connector (Short circuit to ground in the 2-4 brake solenoid valve circuit) - 2-4 brake solenoid valve

DTC REPRODUCTION PROCEDURE

CAUTION: Be careful of the driving speed.

1.PREPARATION BEFORE WORK

If another "DTC CONFIRMATION PROCEDURE" occurs just before, turn ignition switch OFF and wait for at least 10 seconds, then perform the next test.

>> GO TO 2.

2.CHECK DTC DETECTION

1. Drive the vehicle.
2. Maintain the following conditions for 5 seconds or more.

Selector lever : 2 position

Gear : 2GR

Vehicle speed : 20 km/h (13 MPH) or more

3. Stop the vehicle.
4. Check the first trip DTC.

Is "P0979" detected?

YES >> Go to TM, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK CIRCUIT BETWEEN TCM AND A/T UNIT

1. Turn ignition switch OFF.
2. Disconnect the TCM connector and A/T unit connector.
3. Check the continuity between TCM harness connector and ground.

Is the check result normal?

YES >> GO TO 2.

NO >> Repair or replace the malfunctioning parts.

2.CHECK 2-4 BRAKE SOLENOID VALVE

Check the 2-4 brake solenoid valve. Refer to TM, "Component Inspection (2-4 Brake Solenoid Valve)".

Is the check result normal?

YES >> Check intermittent incident. Refer to GI, "Intermittent Incident".

NO >> Repair or replace the malfunctioning parts.

Component Inspection (2-4 Brake Solenoid Valve)

1.CHECK 2-4 BRAKE SOLENOID VALVE

Check the resistance between the A/T unit connector and ground. 

Is the check result normal?

YES >> INSPECTION END

NO >> There is a malfunction of the 2-4 brake solenoid valve. Replace the transaxle assembly. Refer to TM, "Removal and Installation".