Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - AB60F AUTOMATIC TRANSMISSION / TRANSAXLE
CHECK DTC OUTPUT (IN ADDITION TO DTC P0781)
PERFORM ACTIVE TEST USING GTS (RUNNING TEST)
PERFORM ACTIVE TEST USING GTS (SHIFT SOLENOID VALVE SLT)
CLEAR DTC AND PERFORM RUNNING TEST
DTC P0781 1-2 Shift (1-2 Shift Valve)
DESCRIPTION
The 1-2 shift valve performs shifting to 1st gear and other gears. When shifting to 2nd and 4th gears is impossible, or when the ECM directs the gearshift to switch to 5th and 6th gear and the engine overruns (clutch slips), this DTC is output.
| DTC Code | DTC Detection Condition | Trouble Area |
| P0781 | When conditions (a) and (b), or (a) and (c) are met. (2 trip detection logic*1, 1 trip detection logic*2) (b) When the ECM directs the transmission to switch to 4th gear, the actual gear is shifted to 3rd. (c) When the ECM directs the transmission to switch to 5th gear, the engine overruns (clutch slips). | Valve body is blocked up or stuck (1-2 shift valve) Shift solenoid valve SLT remains open or closed Automatic transmission (clutch, brake, gear, etc.) |
- HINT:
| ECM command gearshift | 1st | 2nd | 3rd | 4th | 5th | 6th |
| Actual gear position under malfunction | 1st | 1st | 3rd | 3rd | N* | N* |
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 |
| Actual gear position under fail-safe mode | 1st* | 1st* | 3rd | 3rd | 3rd | 3rd |
- 1st*: Under engine braking, downshifting to 1st or 2nd gear is prohibited.
MONITOR DESCRIPTION
This DTC indicates that the 1-2 shift valve in the valve body is locked in the position in which the spring is compressed.
The ECM commands gear shifts by turning the shift solenoid valves ON/OFF and switching oil pressure to the valves in the valve body.
The ECM calculates the actual transmission gear by comparing the signals from the input speed sensor (NT) and the output speed sensor (SP2). The ECM can detect many mechanical problems in the shift solenoids, valve body, transmission clutches, brakes, and gears. If the ECM detects that the actual gear position and commanded gear position are different, it will illuminate the MIL and store the DTC.
INSPECTION PROCEDURE
| 1.CHECK DTC OUTPUT (IN ADDITION TO DTC P0781) |
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 |
| Only P0781 is output | A |
| P0781 and other DTCs are output | B |
- HINT:
- If any other codes besides P0781 are output, perform troubleshooting for those DTCs first.
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| A | |
| 2.PERFORM ACTIVE TEST USING GTS (RUNNING TEST) |
- CAUTION:
- This test should always be performed with at least 2 people.
- 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 Test early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Test.
Connect the GTS to the DLC3.
Clear the DTC ().
Warm up the engine.
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 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:
| Tester command gearshift | 1st | 2nd | 3rd | 4th | 5th | 6th |
| Actual gear position under malfunction | 1st | 1st | 3rd | 3rd | N* | N* |
- OK:
- Gear position changes in accordance with the GTS command.
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| OK | |
| 3.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 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 the shift solenoid SLT and raise line pressure | ON or OFF
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.
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| OK | |
| 4.CLEAR DTC AND PERFORM RUNNING TEST |
Clear the DTC ().
Check for DTCs again after conducting the Monitor Drive Pattern ().
- OK:
- No DTC code output.
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| OK | ||
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