Dtc P0979 Shift Solenoid C Control Circuit Low (Shift Solenoid Valve S3)

Drivetrain. Land Cruiser. Urj200, 202 Grj200 Vdj200
Ab60F Automatic Transmission Transaxle. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT NO. 1 TRANSMISSION WIRE (SHIFT SOLENOID VALVE S3)

CHECK HARNESS AND CONNECTOR (NO. 1 TRANSMISSION WIRE - ECM)

INSPECT SHIFT SOLENOID VALVE S3

DTC P0979 Shift Solenoid "C" Control Circuit Low (Shift Solenoid Valve S3)

DTC P0980 Shift Solenoid "C" Control Circuit High (Shift Solenoid Valve S3)


DESCRIPTION

Shifting from 1st to 6th is performed in combination with ON and OFF operation of the shift solenoid valves SL1, SL2, S1, S2, S3, S4 and SR, which are controlled by the ECM. If an open or short circuit occurs in any of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated safely. Also, the ECM stops sending the current to the open or short circuited solenoid (Click here).

DTC Code
DTC Detection Condition
Trouble Area
P0979
ECM detects short in solenoid valve S3 circuit 2 times when solenoid valve S3 is operated (1 trip detection logic).
  1. Short in shift solenoid valve S3 circuit
  2. Shift solenoid valve S3
  3. ECM
P0980
ECM detects open in solenoid valve S3 circuit 2 times when solenoid valve S3 is not operated (1 trip detection logic).
  1. Open in shift solenoid valve S3 circuit
  2. Shift solenoid valve S3
  3. ECM

MONITOR DESCRIPTION

These DTCs indicate an open or short in the shift solenoid valve S3 circuit. When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem, illuminates the MIL and stores the DTC. When the shift solenoid valve S3 is ON, if its resistance is 8 Ω or less, the ECM determines there is a short in the shift solenoid valve S3 circuit.
When the shift solenoid valve S3 is OFF, if its resistance is 100 kΩ or more, the ECM determines there is an open in the shift solenoid valve S3 circuit (Click here).

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Ab60F Automatic Transmission Transaxle.Automatic Transmission System (For 1Ur-Fe). Dtc P0979 Shift Solenoid C Control Circuit Low (Shift Solenoid Valve S3)


INSPECTION PROCEDURE


HINT:
Shift solenoid valve S3 is turned ON/OFF normally when the shift lever is in D.

ECM gear shift command
1st
2nd
3rd
4th
5th
6th
Shift solenoid valve S3
ON
ON
ON
OFF
OFF
OFF
1.INSPECT NO. 1 TRANSMISSION WIRE (SHIFT SOLENOID VALVE S3)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Ab60F Automatic Transmission Transaxle.Automatic Transmission System (For 1Ur-Fe). Dtc P0979 Shift Solenoid C Control Circuit Low (Shift Solenoid Valve S3)

  1. Disconnect the No. 1 transmission wire connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    7 (S3) - Body ground
    		20°C (68°F)
    		11 to 15 Ω
    Text in Illustration
    *a
    		Component without harness connected
    (No. 1 Transmission Wire)


NG
Go to step 3
OK


2.CHECK HARNESS AND CONNECTOR (NO. 1 TRANSMISSION WIRE - ECM)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Ab60F Automatic Transmission Transaxle.Automatic Transmission System (For 1Ur-Fe). Dtc P0979 Shift Solenoid C Control Circuit Low (Shift Solenoid Valve S3)

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    C45-3 (S3) - Body ground
    		20°C (68°F)
    		11 to 15 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to ECM)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (Click here)

3.INSPECT SHIFT SOLENOID VALVE S3


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Ab60F Automatic Transmission Transaxle.Automatic Transmission System (For 1Ur-Fe). Dtc P0979 Shift Solenoid C Control Circuit Low (Shift Solenoid Valve S3)

  1. Remove the shift solenoid valve S3.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    Shift solenoid valve S3 connector terminal - Shift solenoid valve S3 body
    		20°C (68°F)
    		11 to 15 Ω

  1. Apply 12 V battery voltage to the shift solenoid valve and check that the valve moves and makes an operating noise.

    OK:
    Measurement Condition
    		Specified Condition
    1. Battery positive (+) → Shift solenoid valve S3 connector
    2. Battery negative (-) → Shift solenoid valve S3 body
    		Valve moves and makes an operating noise
Text in Illustration
*a
Component without harness connected
(Shift Solenoid Valve S3)


NG
REPLACE SHIFT SOLENOID VALVE S3 (Click here)
OK

REPAIR OR REPLACE NO. 1 TRANSMISSION WIRE (Click here)