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Home >> Toyota >> 2008 >> FJ Cruiser RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 143 (Automatic Transmission - A750F) >> Automatic Transmission System >> DTC P0781 1-2 Shift (1-2 Shift Valve) >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0781) 
    1. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
    2. Turn the ignition switch ON and push the intelligent tester main switch ON.
    3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
    4. Read the DTCs using the intelligent tester.

    Result 

    RESULT REFERENCE

    Display (DTC output) Proceed to
    Only P0781 is output A
    P0781 and other DTCs B

    HINT:

    If any other codes besides P0781 are output, perform troubleshooting for those DTCs first.

    B: GO TO DTC CHART 

    A: GO TO Next Step 

  2. PERFORM  ACTIVE TEST   BY INTELLIGENT TESTER (RUNNING TEST) 

    HINT:

    Performing the intelligent tester's ACTIVE TEST allows relay, VSV, actuator and other items to be operated without removing any parts. Performing the ACTIVE TEST  early in troubleshooting is one way to save time.

    The DATA LIST can be displayed during the ACTIVE TEST.

    1. Warm up the engine.
    2. Turn the ignition switch OFF.
    3. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
    4. Turn the ignition switch ON.
    5. Turn the intelligent tester ON.
    6. Enter the following menus: DIAGNOSIS / OBD/MOBD / ECT / ACTIVE TEST.
    7. Perform the ACTIVE TEST  using the intelligent tester.

    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 (see FAIL-SAFE CHART ).

    ECM 

    ACTIVE TEST DETAIL

    Tester Display Test Part Control Range Diagnostic Note
    SHIFT Operate shift solenoid valve and set each shift position by yourself
    • Press "→" button: Shift up
    • Press "←" button: Shift down
    		 Possible to check operation of shift solenoid valves
    [Vehicle Condition]
    50 km/h (30 mph) or less

    HINT:

    • This test can be conducted when the vehicle speed is 31 mph (50 km/h) or less.
    • The 4th to 5th up-shift must be performed with the accelerator pedal released.
    • The 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 (SHIFT) display on the intelligent tester.

    OK: Gear position changes in accordance with the tester command. 

    NG: REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY 

    OK: GO TO Next Step 

  3. PERFORM  ACTIVE TEST   BY INTELLIGENT TESTER (SHIFT SOLENOID VALVE SLT) 
    NOTE:
    • Perform the test at the normal operating ATF temperature: 50 to 80°C (122 to 176°F).
    • Be careful to prevent SSTs hose from interfering with the exhaust pipe.
    • Perform the test with the A/C OFF.

    HINT:

    Performing the intelligent tester's ACTIVE TEST allows relay, VSV, actuator and other items to be operated without removing any parts. Performing the ACTIVE TEST  early in troubleshooting is one way to save time. The DATA LIST can be displayed during the ACTIVE TEST.

    Fig 1: Measuring Line Pressure With SST
    G04963197Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the test plug on the transmission case center right side and connect SST.

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

    2. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
    3. Start the engine and warm it up.
    4. Measure the line pressure with SST.
    5. Turn the intelligent tester ON.
    6. Enter the following menus: DIAGNOSIS / OBD/MOBD / ECT/ ACTIVE TEST.
    7. Follow the instructions on the tester and perform the ACTIVE TEST .
    8. Measure the line pressure with SST.

    ECM 

    ACTIVE TEST DETAIL

    Tester Display Test Part Control Range Diagnostic Note
    LINE PRESS UP* Operate the shift solenoid SLT and raise line pressure ON or OFF
    HINT:
    • OFF: Line pressure up (when Active Test "LINE PRESS UP" is performed, ECM commands SLT solenoid to turn OFF)
    • ON: No action (normal operation)
    		 [Vehicle Condition]
    • Vehicle stopped
    • Engine: idling

    HINT:

    *: LINE PRESS UP 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: GO TO Next Step 

  4. CLEAR DTC AND PERFORM RUNNING TEST 
    1. Clear the DTC, and check for the DTC again after conducting the "MONITOR DRIVE PATTERN FOR ECT TEST" (see MONITOR DRIVE PATTERN ).

    OK: No DTC code 

    NG: REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY 

    OK: END 

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