DTC P2756-14: Torque Converter Clutch Pressure Control Solenoid Control Circuit Short to Ground or Open [11/2021 - ]: Procedure
WARNING: This page is about a different car, the 2025 Lexus NX 350, 2024 Lexus NX 350, 2023 Lexus NX 350, and 2022 Lexus NX 350. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE (SOLENOID (SLU) VALVE) - ECM)
- Disconnect the B51 ECM connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition B51-35 (SLU+) - B51-36 (SLU-) 20°C (68°F) 5.0 to 5.6 Ω B51-35 (SLU+) or B51-36 (SLU-) - Body ground and other terminals Always 10 kΩ or higher Result
Proceed to OK NG
Result:
NG
See step 3
Result:
OK
See step 2
- REPLACE ECM
Refer to REMOVAL [11/2021 - ]
Result
Proceed to NEXT Result:
NEXT
PERFORM REGISTRATION. Refer to REGISTRATION [11/2021 - ]
- CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
- Disconnect the B39 transmission wire connector.
- Disconnect the B51 ECM connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition B39-5 (SLU+) - B51-35 (SLU+) Always Below 1 Ω B39-4 (SLU-) - B51-36 (SLU-) Always Below 1 Ω B39-5 (SLU+) or B51-35 (SLU+) - Body ground and other terminals Always 10 kΩ or higher B39-4 (SLU-) or B51-36 (SLU-) - Body ground and other terminals Always 10 kΩ or higher Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - ECM)
Result:
OK
See step 4
- INSPECT SOLENOID (SLU) VALVE
- Remove the solenoid (SLU) valve.
*a Component without harness connected
(Solenoid (SLU) Valve)Refer to DISASSEMBLY [11/2021 - ]
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition Solenoid (SLU) valve connector terminal 1 - terminal 2 20°C (68°F) 5.0 to 5.6 Ω - Connect a positive (+) lead from the battery with a 21 W bulb to terminal 1 and a negative (-) lead to terminal 2 of the solenoid valve connector. Check that the valve moves and makes an operating sound.
OK
Valve moves and makes operating sound.
Result
Proceed to OK NG
Result:
OK
REPAIR OR REPLACE TRANSMISSION WIRE. Refer to REMOVAL [11/2021 - ]
Result:
NG
REPLACE SOLENOID (SLU) VALVE. Refer to REMOVAL [11/2021 - ]
- Remove the solenoid (SLU) valve.