DTC P0740-15: Torque Converter Clutch Circuit Short to Battery or Open [10/2022 - ]: Procedure
WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
- INSPECT TRANSMISSION WIRE (SOLENOID (SL) VALVE)
Pre-procedure1
- Disconnect the B25 transmission wire connector.
- Measure the resistance according to the value(s) in the table below.
*a Component without harness connected
(Transmission Wire)Standard Resistance
Tester Connection Condition Specified Condition Result B25-13 (SL) - Body ground 20°C (68°F) 11 to 15 Ω Ω B25-13 (SL) - Other terminals Always 10 kΩ or higher kΩ Result
Proceed to OK NG
Post-procedure1
- Connect the B25 transmission wire connector.
Result:
NG
See step 4
Result:
OK
See step 2
- CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
Pre-procedure1
- Disconnect the B29 ECM connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition Result B29-42 (SL) - Body ground 20°C (68°F) 11 to 15 Ω Ω B29-42 (SL) - Other terminals Always 10 kΩ or higher kΩ Result
Proceed to OK NG
Post-procedure1
- None
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - ECM)
Result:
OK
See step 3
- REPLACE ECM
HINT:
Refer to REMOVAL [10/2022 - ]
Result
Proceed to NEXT Result:
NEXT
PERFORM REGISTRATION. Refer to REGISTRATION [10/2022 - ]
- INSPECT SOLENOID (SL) VALVE
Refer to INSPECTION [10/2022 - ]
Result
Proceed to OK NG Result:
OK
REPAIR OR REPLACE TRANSMISSION WIRE. Refer to REMOVAL [10/2022 - ]
Result:
NG
REPLACE SOLENOID (SL) VALVE. Refer to REMOVAL [10/2022 - ]