DTC P0740-7F: Torque Converter Clutch Actuator Stuck Off [09/2015 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Transmission / Trouble Codes.

   Powertrain > Transmission > Trouble Codes 

5. Read the DTCs using the Techstream.

   Result

   Result	Proceed to
   Only DTC P0740-7F is output	A
   P0740-7F and other DTCs are output	B

   HINT: 

   If any other codes besides P0740-7F are output, perform the troubleshooting for those DTCs first.

Result: 

B 

GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2015 - 09/2016]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2016 - 09/2017]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2017 - 05/2018]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [05/2018 - 05/2019]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [05/2019 - 07/2020]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [07/2020 - ] 

Result: 

A 

See step  2

1. Remove the wiring harness connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Transmission Wire)

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A-6 (SL) - Body ground	20°C (68°F)	11 to 15 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  6

Result: 

OK 

See step  3

1. Remove shift solenoid valve SL.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Shift Solenoid Valve SL

   Refer to DISASSEMBLY [10/2014 - ]

2. 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 SL connector Battery negative (-) → Shift solenoid valve SL body	Valve moves and makes an operating noise

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE SHIFT SOLENOID VALVE SL. Refer to  DISASSEMBLY [10/2014 - ] 

Result: 

OK 

See step  4

1. Check the transmission valve body assembly.

   Refer to REMOVAL [10/2014 - ]

   OK

   There is no foreign matter on each valve and they operate smoothly.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY. Refer to  REMOVAL [10/2014 - ] 

Result: 

OK 

See step  5

1. Check the torque converter assembly.

   Refer to INSPECTION [10/2014 - ]

   OK

   The torque converter operates normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY. Refer to  REMOVAL [09/2015 - 05/2019]  , or refer to  REMOVAL [05/2019 - ] 

Result: 

NG 

REPLACE TORQUE CONVERTER ASSEMBLY. Refer to  REMOVAL [09/2015 - 05/2019]  , or refer to  REMOVAL [05/2019 - ] 

1. Remove shift solenoid valve SL.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Shift Solenoid Valve SL

   Refer to DISASSEMBLY [10/2014 - ]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Shift solenoid valve SL connector terminal - Shift solenoid valve SL body	20°C (68°F)	11 to 15 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE TRANSMISSION WIRE. Refer to  REMOVAL [10/2014 - ] 

Result: 

NG 

REPLACE SHIFT SOLENOID VALVE SL. Refer to  DISASSEMBLY [10/2014 - ]