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

DESCRIPTION

MONITOR DESCRIPTION

INSPECTION PROCEDURE

CHECK DTC OUTPUT (IN ADDITION TO DTC P0751)

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SHIFT SOLENOID VALVE SLT)

INSPECT SHIFT SOLENOID VALVE S1

INSPECT TRANSMISSION VALVE BODY ASSEMBLY

DTC P0751 Shift Solenoid "A" Performance (Shift Solenoid Valve S1)

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 of the shift solenoid valves, valve body or automatic transmission (clutch, brake, gear, etc.).

DTC CodeDTC Detection ConditionTrouble Area
P0751
S1 stuck ON malfunction*1:
The ECM determines there is a malfunction when the following conditions are both met. (1 trip detection logic)
(a) When the ECM directs the transmission to switch to 1st gear, the actual gear is shifted to 2nd.
(b) When the ECM directs the transmission to switch to 5th gear, the actual gear is also shifted to 5th.
Shift solenoid valve S1 remains closed
Valve body is blocked
Automatic transmission (clutch, brake, gear, etc.)
P0751
S1 stuck OFF malfunction*2:
The ECM determines there is a malfunction when conditions (a) and (b) are met. (1 trip detection logic)
(a) When the ECM directs the transmission to switch to 5th gear, the actual gear is also shifted to 5th.
(b) When the ECM directs the transmission to switch to 6th gear, the engine overruns (clutch slips).
Shift solenoid valve S1 remains open
Shift solenoid valve SLT remains open or closed
Valve body is blocked
No. 2 brake malfunction (Driving is difficult.)
Automatic transmission (clutch, brake, gear, etc.)
  • HINT:
Gear positions in the event of a solenoid valve mechanical problem:
ECM command gearshift1st2nd3rd4th5th6th
*1: Actual gear position under S1 stuck ON malfunction2nd2nd3rd4th5th6th
*2: Actual gear position under S1 stuck OFF malfunction1st1st3rd4th5thN*
N*: Neutral
Gear position during fail-safe operation:
If any malfunction is detected, the ECM changes into the fail-safe mode to shift into the gear positions as shown in the table below.
Gear position under normal conditions1st2nd3rd4th5th6th
*1: Actual gear position under fail-safe mode when S1 stuck ON malfunction2nd2nd3rd4th5th6th
*2: Actual gear position under fail-safe mode when S1 stuck OFF malfunction1st*31st*33rd3rd3rd3rd
*3: Under engine braking, downshifting to 1st or 2nd gear is prohibited.

MONITOR DESCRIPTION

This DTC indicates stuck ON malfunction or stuck OFF malfunction of shift solenoid valve S1.


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 engine switch off.

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG).

Turn the intelligent tester on.

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

According to the display on the intelligent 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 ().
Engine and ECT
Tester DisplayTest PartControl RangeDiagnostic Note
Control the Shift PositionOperate shift solenoid valves and set each shift position by yourself
Press "→" button: Shift up
Press "←" button: Shift down
Possible to check operation of the shift solenoid valves.
[Vehicle Condition]
50 km/h (30 mph) or less
  • HINT:
This test can be conducted when the vehicle speed is 50 km/h (30 mph) or less.
The 4th to 5th and 5th to 6th up-shift must be performed with the accelerator pedal released.
The 6th to 5th and 5th to 4th down-shift 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 intelligent tester.
Shift solenoid valve S1 turns ON/OFF normally when the shift lever is in D.
ECM command gearshift1st2nd3rd4th5th6th
Shift solenoid valve S1OFFONONONONON
1.CHECK DTC OUTPUT (IN ADDITION TO DTC P0751)

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG).

Turn the intelligent tester on.

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

Read the DTCs using the intelligent tester.

Result
ResultProceed to
Only P0751 is outputA
P0751 and other DTCs are outputB
  • HINT:
  • If any other codes besides P0751 are output, perform troubleshooting for those DTCs first.
B
GO TO DTC CHART ()
A
2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SHIFT SOLENOID VALVE SLT)
  • NOTICE:
Perform the test while the ATF temperature is between 50 and 80°C (122 and 176°F).
Be careful to prevent the hose of SST from interfering with the exhaust pipe.
Perform the test with the A/C off.
  • 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.
Dtc P0751 Shift Solenoid A Performance (Shift Solenoid Valve S1). AB60F AUTOMATIC TRANSMISSION / TRANSAXLE. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Remove the test plug on the transmission case and connect SST.

  • SST
  • 09992-00095(09992-00231,09992-00271)

Connect the intelligent tester to the DLC3.

Start the engine and warm it up.

Measure the line pressure with SST.

Turn the intelligent tester on.

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

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

Measure the line pressure.

Engine and ECT
Tester DisplayTest PartControl RangeDiagnostic Note
Activate the Solenoid (SLT)*Operate the shift solenoid SLT and raise line pressureON or OFF
  • HINT:
OFF: Line pressure up (when Active Test "Activate the Solenoid (SLT)" is performed, ECM commands SLT solenoid to turn OFF)
ON: No action (normal operation)
[Vehicle Condition]
Vehicle stopped
Engine idling
  • HINT:
  • *: Activate the Solenoid (SLT) in the Active Test is performed to check the line pressure changes by connecting SST to the automatic transmission, which is used in the Hydraulic Test () as well. Please note that the pressure values in the Active Test and Hydraulic Test are different.
  • OK:
  • The line pressure changes as specified when performing the Active Test.
NG
REPLACE SHIFT SOLENOID VALVE SLT ()
OK
3.INSPECT SHIFT SOLENOID VALVE S1
Dtc P0751 Shift Solenoid A Performance (Shift Solenoid Valve S1). AB60F AUTOMATIC TRANSMISSION / TRANSAXLE. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Remove the shift solenoid valve S1.

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    Shift solenoid valve S1 connector terminal - Shift solenoid valve S1 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 S1 connector
    Battery negative (-) → Shift solenoid valve S1 body
    		Valve moves and makes an operating noise
Text in Illustration
*aComponent without harness connected
(Shift Solenoid Valve S1)
NG
REPLACE SHIFT SOLENOID VALVE S1 ()
OK
4.INSPECT TRANSMISSION VALVE BODY ASSEMBLY

Check the transmission valve body assembly.

  • OK:
  • There are no foreign objects on each valve.
NG
REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY ()
OK
REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY ()
AB60F AUTOMATIC TRANSMISSION / TRANSAXLE
Land Cruiser URJ200 URJ202 GRJ200 VDJ200
AUTOMATIC TRANSMISSION SYSTEM for 3UR-FE