DTC P0781: 1-2 Shift (1-2 Shift Valve) [08/2015 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
5. Read the DTCs using the Techstream.
   RESULT
   
   

   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.

Result: 

B 

GO TO DTC CHART 

(Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2015 - ] )

Result: 

A 

See step  2

HINT: 

Using the Techstream 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.

1. Connect the Techstream to the DLC3.
2. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] , or refer to DTC CHECK / CLEAR [08/2019 - ] ).
3. Warm up the engine.
4. Enter the following menus: Powertrain / Engine and ECT / Active Test.
5. According to the display on the Techstream, perform the Active Test.

   HINT: 

   While driving, the shift position can be forcibly changed with the Techstream.

   Comparing the shift position commanded by the Active Test with the actual shift position enables you to confirm the problem (Refer to FAIL-SAFE CHART [08/2015 - ] ).

   ENGINE AND ECT
   
   

   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	Possible to check operation of the shift solenoid valves. [Vehicle Condition] 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 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 display on the Techstream.

   OK

   Gear position changes in accordance with the Techstream command.

Result: 

NG 

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY 

(Refer to REMOVAL [08/2015 - ] )

Result: 

OK 

See step  3

See step  2 [08/2015 - 08/2017], or see step  2 [08/2017 - ]

Result: 

NG 

REPLACE SHIFT SOLENOID VALVE SLT 

(Refer to PROCEDURE - Step 4 )

Result: 

OK 

See step  4

1. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] , or refer to DTC CHECK / CLEAR [08/2019 - ] ).
2. Check for DTCs again after conducting the Monitor Drive Pattern (Refer to MONITOR DRIVE PATTERN [08/2015 - ] ).

   OK

   No DTC output.

Result: 

OK 

END 

Result: 

NG 

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY 

(Refer to REMOVAL [08/2015 - ] )