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

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - AB60F AUTOMATIC TRANSMISSION / TRANSAXLE

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 CodeDTC Detection ConditionTrouble Area
P0756A 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.
Shift solenoid valve S2 remains open
Valve body is blocked
Automatic transmission (clutch, brake, gear, etc.)
ECM
P0756A 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.
Shift solenoid valve S2 remains closed
Valve body is blocked
Automatic transmission (clutch, brake, gear, etc.)
ECM
  • HINT:
  • Gear positions in the event of a solenoid valve mechanical problem:
ECM gear shift command1st2nd3rd4th5th6th
*1: Actual gear position under S2 stuck ON malfunction1st2nd2nd4th6th6th
*2: Actual gear position under S2 stuck OFF malfunction3rd3rd3rd4th5th5th

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 intelligent tester 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.

Warm up the engine.

Turn the ignition switch off.

Connect the intelligent tester to the DLC3.

Turn the ignition switch to ON.

Turn the intelligent tester on.

Enter the following menus: Powertrain / ECT / Active Test.

According to the display on the tester, perform the Active Test.

  • HINT:
  • While driving, the shift position can be forcibly changed with the intelligent tester.
  • Comparing the shift position commanded by the Active Test with the actual shift position enables you to confirm the problem ().
ECT
Tester DisplayTest PartControl RangeDiagnostic Note
Control the Shift PositionOperate shift solenoid valve and set each shift position
Press "→" button: Shift up
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:
This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.
The 4th to 5th and 5th to 6th up-shifts must be performed with the accelerator pedal released.
The 6th to 5th and 5th to 4th down-shifts must be performed with the accelerator pedal released.
Do not operate the accelerator pedal for at least 2 seconds after shifting and do not shift successively.
The shift position commanded by the ECM is shown in the Data List display on the tester.
The shift solenoid valve S2 turns ON/OFF normally when the shift lever is in D.
ECM gear shift command1st2nd3rd4th5th6th
Shift solenoid valve S2ONONOFFOFFOFFON
1.CHECK DTC OUTPUT (IN ADDITION TO DTC P0756)

Connect the intelligent tester to the DLC3.

Turn the ignition switch to ON.

Turn the intelligent tester on.

Enter the following menus: Powertrain / ECT / Trouble Codes.

Read the DTCs using the tester.

Result
ResultProceed to
Only P0756 is outputA
P0756 and other DTCs are outputB
  • HINT:
  • If any other codes besides P0756 are output, perform troubleshooting for those DTCs first.
B
GO TO DTC CHART ()
A
2.INSPECT SHIFT SOLENOID VALVE S2
Dtc P0756 Shift Solenoid B Performance (Shift Solenoid Valve S2). AB60F AUTOMATIC TRANSMISSION / TRANSAXLE. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Remove the shift solenoid valve S2.

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    Shift solenoid valve S2 connector terminal - Shift solenoid valve S2 body20°C (68°F)11 to 15 Ω

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

  • OK:
  • Measurement ConditionSpecified Condition
    Battery positive (+) → Shift solenoid valve S2 connector
    Battery negative (-) → Shift solenoid valve S2 body
    		Valve moves and makes an operating noise
NG
REPLACE SHIFT SOLENOID VALVE S2 ()
OK
3.INSPECT TRANSMISSION VALVE BODY ASSEMBLY

Check the transmission valve body assembly ().

  • OK:
  • There are no foreign objects on any valve.
NG
REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY ()
OK
REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY ()