Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - AB60F AUTOMATIC TRANSMISSION / TRANSAXLE
CHECK DTC OUTPUT (IN ADDITION TO DTCS P0766 AND P0776)
PERFORM ACTIVE TEST USING GTS (SHIFT SOLENOID VALVE SLT)
INSPECT SHIFT SOLENOID VALVE S4
INSPECT SHIFT SOLENOID VALVE SL2
INSPECT TRANSMISSION VALVE BODY ASSEMBLY
DTC P0766 Shift Solenoid "D" Performance (Shift Solenoid Valve S4)
DTC P0776 Pressure Control Solenoid "B" Performance (Shift Solenoid Valve SL2)
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 or gear, etc.).
| DTC Code | DTC Detection Condition | Trouble Area |
| P0766 | A shift solenoid valve S4 stuck OFF malfunction or brake control valve malfunction*1: Shifting to 5th and 6th 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 4th. (b) When the ECM directs the transmission to switch to 6th gear, the actual gear is shifted to 4th. | Shift solenoid valve S4 remains closed Shift solenoid valve SLT remains open or closed Valve body is blocked (brake control valve) Automatic transmission (clutch, brake or gear, etc.) |
| P0776 | A shift solenoid valve SL2 stuck ON malfunction or brake control valve malfunction*1: Shifting to 5th and 6th 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 4th. (b) When the ECM directs the transmission to switch to 6th gear, the actual gear is shifted to 4th. | Shift solenoid valve SL2 remains open Shift solenoid valve SLT remains open or closed Valve body is blocked (brake control valve) Automatic transmission (clutch, brake or gear, etc.) |
- HINT:
| ECM gear shift command | 1st | 2nd | 3rd | 4th | 5th | 6th |
| *1: Actual gear position under malfunction | 1st | 2nd | 3rd | 4th | 4th | 4th |
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 conditions | 1st | 2nd | 3rd | 4th | 5th | 6th |
| *1: Actual gear position under fail-safe mode | 1st | 2nd | 3rd | 3rd | 3rd | 3rd |
MONITOR DESCRIPTION
This DTC indicates "stuck OFF malfunction" of the shift solenoid valve S4, "stuck ON malfunction" of the shift solenoid valve SL2, or brake control valve malfunction. 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.
Warm up the engine.
Turn the engine switch off.
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Active Test.
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 ().
| Tester Display | Test Part | Control Range | Diagnostic Note |
| Control the Shift Position | Operate 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:
| ECM gear shift command | 1st | 2nd | 3rd | 4th | 5th | 6th |
| Shift solenoid valve S4 | OFF | OFF | OFF | OFF | ON | ON |
| Shift solenoid valve SL2 | ON | ON | ON | ON | OFF | OFF |
| 1.CHECK DTC OUTPUT (IN ADDITION TO DTCS P0766 AND P0776) |
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Read the DTCs using the GTS.
| Result | Proceed to |
| P0766 and/or P0776 is output | A |
| P0766, P0776 and other DTCs are output | B |
- HINT:
- If any other codes besides P0766 and P0776 are output, perform troubleshooting for those DTCs first.
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| A | |
| 2.PERFORM ACTIVE TEST USING GTS (SHIFT SOLENOID VALVE SLT) |
- NOTICE:
- 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.
Remove the test plug on the transmission case center right side and connect SST.
- SST
- 09992-00095(09992-00231,09992-00271)
Connect the GTS to the DLC3.
Start the engine and warm it up.
Measure the line pressure with SST.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Active Test.
According to the display on the GTS, perform the Active Test.
Measure the line pressure.
| Tester Display | Test Part | Control Range | Diagnostic Note |
| Activate the Solenoid (SLT)* | Operate shift solenoid valve SLT and raise line pressure | ON or OFF
OFF: Line pressure up (when Active Test "Activate the Solenoid (SLT)" is performed, ECM commands shift solenoid valve SLT to turn OFF) ON: No action (normal operation) | [Vehicle Condition] The vehicle is stopped. The engine is 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. 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.
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| OK | |
| 3.INSPECT SHIFT SOLENOID VALVE S4 |
Remove the shift solenoid valve S4.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition Shift solenoid valve S4 connector terminal - Shift solenoid valve S4 body 20°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 Condition Specified Condition Battery positive (+) → Shift solenoid valve S4 connectorBattery negative (-) → Shift solenoid valve S4 bodyValve moves and makes an operating noise
| *a | Component without harness connected (Shift Solenoid Valve S4) |
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| OK | |
| 4.INSPECT SHIFT SOLENOID VALVE SL2 |
Remove the shift solenoid valve SL2.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition 1 - 2 20°C (68°F) 5.0 to 5.6 Ω
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 Battery positive (+) with a 21 W bulb → Terminal 1Battery negative (-) → Terminal 2Valve moves and makes an operating noise
| *a | Component without harness connected (Shift Solenoid Valve SL2) |
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| OK | |
| 5.INSPECT TRANSMISSION VALVE BODY ASSEMBLY |
Check the transmission valve body assembly ().
- OK:
- There are no foreign objects on any valve.
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| OK | ||
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