Dtc P0756 Shift Solenoid B Performance (Shift Solenoid Valve S2)

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

DESCRIPTION

MONITOR DESCRIPTION

INSPECTION PROCEDURE

CHECK DTC OUTPUT (IN ADDITION TO DTC P0756)

INSPECT SHIFT SOLENOID VALVE S2

INSPECT TRANSMISSION VALVE BODY ASSEMBLY

DTC P0756 Shift Solenoid "B" Performance (Shift Solenoid Valve S2)


DESCRIPTION

The ECM uses signals from the output shaft speed sensor and input speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th, 5th or 6th gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical problems with the shift solenoid valves, valve body or automatic transmission (clutch, brake, gear, etc.).

DTC Code
DTC Detection Condition
Trouble Area
P0756
A shift solenoid valve S2 stuck ON malfunction*1:
Shifting to 3rd and 5th gears is impossible.
The ECM determines there is a malfunction when the following conditions are both met (2 trip detection logic).
(a) When the ECM directs the transmission to switch to 5th gear, the actual gear is shifted to 6th.
(b) When the ECM directs the transmission to switch to 6th gear, the actual gear is shifted to 6th.
  1. Shift solenoid valve S2 remains open
  2. Valve body is blocked
  3. Automatic transmission (clutch, brake, gear, etc.)
  4. ECM
P0756
A shift solenoid valve S2 stuck OFF malfunction*2:
The vehicle starts in 3rd gear and shifting to 6th gear is impossible.
The ECM determines there is a malfunction when the following conditions are both met (2 trip detection logic).
(a) When the ECM directs the transmission to switch to 1st gear, the actual gear is shifted to 3rd.
(b) When the ECM directs the transmission to switch to 6th gear, the actual gear is shifted to 5th.
  1. Shift solenoid valve S2 remains closed
  2. Valve body is blocked
  3. Automatic transmission (clutch, brake, gear, etc.)
  4. ECM

HINT:
Gear positions in the event of a solenoid valve mechanical problem:

ECM gear shift command
1st
2nd
3rd
4th
5th
6th
*1: Actual gear position under S2 stuck ON malfunction
1st
2nd
2nd
4th
6th
6th
*2: Actual gear position under S2 stuck OFF malfunction
3rd
3rd
3rd
4th
5th
5th

MONITOR DESCRIPTION

This DTC indicates a stuck ON malfunction or stuck OFF malfunction of the shift solenoid valve S2.
The ECM commands gear shifts by turning the shift solenoid valves ON/OFF. When the gear position commanded by the ECM and the actual gear position are not the same, the ECM illuminates the MIL and stores the DTC.

INSPECTION PROCEDURE


ACTIVE TEST
HINT:
Using the GTS to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

  1. Warm up the engine.

  2. Turn the ignition switch off.

  3. Connect the GTS to the DLC3.

  4. Turn the ignition switch to ON.

  5. Turn the GTS on.

  6. Enter the following menus: Powertrain / Engine and ECT / Active Test.

  7. According to the display on the GTS, perform the Active Test.

    HINT:
    While driving, the shift position can be forcibly changed with the GTS.
    Comparing the shift position commanded by the Active Test with the actual shift position enables you to confirm the problem (Click here).

    Engine and ECT
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Control the Shift Position
    		Operate shift solenoid valve and set each shift position
    1. Press "→" button: Shift up
    2. Press "←" button: Shift down
    		It is possible to check the operation of the shift solenoid valves.
    [Vehicle Condition]
    The vehicle speed is 50 km/h (31 mph) or less.
    HINT:
    1. This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.
    2. The 4th to 5th and 5th to 6th up-shifts must be performed with the accelerator pedal released.
    3. The 6th to 5th and 5th to 4th down-shifts must be performed with the accelerator pedal released.
    4. Do not operate the accelerator pedal for at least 2 seconds after shifting and do not shift successively.
    5. The shift position commanded by the ECM is shown in the Data List display on the GTS.
    6. The shift solenoid valve S2 turns ON/OFF normally when the shift lever is in D.

      ECM gear shift command
      		1st
      		2nd
      		3rd
      		4th
      		5th
      		6th
      Shift solenoid valve S2
      		ON
      		ON
      		OFF
      		OFF
      		OFF
      		ON
1.CHECK DTC OUTPUT (IN ADDITION TO DTC P0756)

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the GTS on.

  1. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

  1. Read the DTCs using the GTS.

    Result
    Result
    		Proceed to
    Only P0756 is output
    		A
    P0756 and other DTCs are output
    		B
    HINT:
    If any other codes besides P0756 are output, perform troubleshooting for those DTCs first.


B
GO TO DTC CHART (Click here)
A


2.INSPECT SHIFT SOLENOID VALVE S2


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Ab60F Automatic Transmission Transaxle.Automatic Transmission System (For 1Ur-Fe). Dtc P0756 Shift Solenoid B Performance (Shift Solenoid Valve S2)

  1. Remove the shift solenoid valve S2.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    Shift solenoid valve S2 connector terminal - Shift solenoid valve S2 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 S2 connector
    2. Battery negative (-) → Shift solenoid valve S2 body
    		Valve moves and makes an operating noise


NG
REPLACE SHIFT SOLENOID VALVE S2 (Click here)
OK


3.INSPECT TRANSMISSION VALVE BODY ASSEMBLY

  1. Check the transmission valve body assembly (Click here).

    OK:
    There are no foreign objects on any valve.


NG
REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY (Click here)
OK

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY (Click here)