DTC P2681-11: Engine Coolant Bypass Valve Circuit Short to Ground; DTC P2681-15: Engine Coolant Bypass Valve Circuit Short to Battery or Open [08/2023 - ]: Procedure
WARNING: This page is about a different car, the 2025 Lexus RX 450h+, 2025 Lexus RX 350h, 2024 Lexus RX 450h+, 2024 Lexus RX 350h, and 2023 Lexus RX 350h. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK TERMINAL VOLTAGE (POWER SOURCE OF FLOW SHUTTING VALVE)
Pre-procedure1
- Disconnect the flow shutting valve (water by-pass hose assembly) connector.
- Turn the ignition switch to ON.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition Result B78-2 (+FSV) - Body ground Ignition switch ON 11 to 14 V V Result
Proceed to OK NG
Post-procedure1
- None.
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - FLOW SHUTTING VALVE)
Result:
OK
See step 2
- INSPECT FLOW SHUTTING VALVE (WATER BY-PASS HOSE ASSEMBLY)
HINT:
Refer to INSPECTION [10/2022 - ]
Result
Proceed to OK NG Result:
NG
REPLACE FLOW SHUTTING VALVE (WATER BY-PASS HOSE ASSEMBLY). Refer to REMOVAL [08/2023 - ]
Result:
OK
See step 3
- CHECK HARNESS AND CONNECTOR (FLOW SHUTTING VALVE - ECM)
Pre-procedure1
- Disconnect the flow shutting valve (water by-pass hose assembly) connector.
- Disconnect the ECM connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition Result B78-1 (-FSV) - B28-42 (WSV1) Always Below 1 Ω Ω B78-1 (-FSV) or B28-42 (WSV1) - Body ground and other terminals Always 10 kΩ or higher kΩ Result
Proceed to OK NG
Post-procedure1
- None.
Result:
OK
REPLACE ECM. Refer to REMOVAL [08/2023 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR