DTC P2681-11: Engine Coolant Bypass Valve Circuit Short to Ground; DTC P2681-15: Engine Coolant Bypass Valve Circuit Short to Battery or Open [08/2020 - ]: Procedure

WARNING: This page is about a different car, the 2021 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

CHECK TERMINAL VOLTAGE (POWER SOURCE OF FLOW SHUTTING VALVE (FOR HEATER CONTROL))

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to Flow Shutting Valve (for Heater Control) (Water By-pass Hose Assembly))

Disconnect the flow shutting valve (for heater control) (water by-pass hose assembly) connector.
Turn the engine switch on (IG).

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

Standard Voltage

Tester Connection	Condition	Specified Condition
C44-2 (+FSV) - Body ground	Engine switch on (IG)	11 to 14 V

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - FLOW SHUTTING VALVE (FOR HEATER CONTROL))

Result:

See step 2

INSPECT FLOW SHUTTING VALVE (FOR HEATER CONTROL) (WATER BY-PASS HOSE ASSEMBLY)

Inspect the flow shutting valve (for heater control) (water by-pass hose assembly).

Refer to INSPECTION [08/2020 - ]

Result

Proceed to
OK
NG

Result:

REPLACE FLOW SHUTTING VALVE (FOR HEATER CONTROL) (WATER BY-PASS HOSE ASSEMBLY). Refer to REMOVAL [08/2020 - ]

Result:

See step 3

CHECK HARNESS AND CONNECTOR (FLOW SHUTTING VALVE (FOR HEATER CONTROL) - ECM)

Disconnect the flow shutting valve (for heater control) (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
C44-1 (-FSV) - C109-42 (WSV1)	Always	Below 1 Ω
C44-1 (-FSV) or C109-42 (WSV1) - Body ground and other terminals	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPLACE ECM. Refer to REMOVAL [08/2020 - ]

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR