DTC P0CDF-11: Hybrid/EV Battery Pack Coolant Control Valve "A" Control Circuit Low Circuit Short to Ground; DTC P0CDF-15: Hybrid/EV Battery Pack Coolant Control Valve "A" Control Circuit High Circuit Short to Auxiliary Battery or Open [08/2023 - ]: Procedure

WARNING: This page is about a different car, the 2025 Lexus RX 450h+ and 2024 Lexus RX 450h+. However, it is still accessible from the selected car via links, so may be relevant.

CHECK BATTERY ECU ASSEMBLY (SNVB VOLTAGE)

WARNING:

Be sure to wear insulated gloves and protective goggles.

Pre-procedure1

Check that the service plug grip is not installed.
NOTE:
After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.
Connect the SST.
HINT:

Refer to Instructions for Connecting SST [08/2023 - ]

Disconnect the No. 2 magnet valve assembly connector.

NOTE:

Before disconnecting the connector, check that it is not loose or disconnected.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Connect the cable to the negative (-) auxiliary battery terminal.
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
o9-1 (VHMV) - o9-2 (VD)	Ignition switch ON	11 to 14 V	V
o9-1 (VHMV) - Body ground	Ignition switch ON	11 to 14 V	V

NOTE:

Turning the ignition switch to ON with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
If the ignition switch is turned to ON with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to No. 2 Magnet Valve Assembly)

Result

Proceed to
OK
NG

Post-procedure1

Turn the ignition switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Reconnect the No. 2 magnet valve assembly connector.
Disconnect the SST.

Result:

See step 3

Result:

See step 2

INSPECT NO. 2 MAGNET VALVE ASSEMBLY

Pre-procedure1

Remove the No. 2 magnet valve assembly.
HINT:

Refer to REMOVAL [08/2023 - ]

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Result
o9-1 (VHMV) - o9-2 (VD)	20°C (68°F)	15.9 to 18.5 Ω	Ω

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Component without harness connected (No. 2 Magnet Valve Assembly)

Result

Proceed to
OK
NG

Post-procedure1

Install the No. 2 magnet valve assembly.

Result:

REPLACE BATTERY ECU ASSEMBLY. Refer to REMOVAL [08/2023 - ]

Result:

REPLACE NO. 2 MAGNET VALVE ASSEMBLY. Refer to REMOVAL [08/2023 - ]

CHECK HARNESS AND CONNECTOR (NO. 2 MAGNET VALVE ASSEMBLY - BODY GROUND)

WARNING:

Be sure to wear insulated gloves and protective goggles.

Pre-procedure1

Check that the service plug grip is not installed.
NOTE:
After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

Disconnect the No. 2 magnet valve assembly connector.

NOTE:

Before disconnecting the connector, check that it is not loose or disconnected.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Result
o9-2 (VD) - Body ground	Ignition switch off	Below 1 Ω	Ω

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to No. 2 Magnet Valve Assembly)

Result

Proceed to
OK
NG

Post-procedure1

Reconnect the No. 2 magnet valve assembly connector.

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 4

CHECK HARNESS AND CONNECTOR (NO. 2 MAGNET VALVE ASSEMBLY - BATTERY ECU ASSEMBLY)

WARNING:

Be sure to wear insulated gloves and protective goggles.

Pre-procedure1

Check that the service plug grip is not installed.
NOTE:
After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.
Connect the SST.
HINT:

Refer to Instructions for Connecting SST [08/2023 - ]

Disconnect the battery ECU assembly connector.

NOTE:

Before disconnecting the connector, check that it is not loose or disconnected.

Disconnect the No. 2 magnet valve assembly connector.

NOTE:

Before disconnecting the connector, check that it is not loose or disconnected.

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Result
o9-1 (VHMV) - o6-10 (SNV0)	Ignition switch off	Below 1 Ω	Ω
o9-1 (VHMV) or o6-10 (SNV0) - Body ground and other terminals	Ignition switch off	10 kΩ or higher	kΩ

*a	Front view of wire harness connector (to No. 2 Magnet Valve Assembly)
*b	Front view of wire harness connector (to Battery ECU Assembly)

Connect the cable to the negative (-) auxiliary battery terminal.
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
o6-10 (SNV0) - Body ground	Ignition switch ON	Below 1 V	V

NOTE:

Turning the ignition switch to ON with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
If the ignition switch is turned to ON with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

Result

Proceed to
OK
NG

Post-procedure1

Turn the ignition switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Reconnect the No. 2 magnet valve assembly connector.
Reconnect the battery ECU assembly connector.
Disconnect the SST.

Result:

REPLACE BATTERY ECU ASSEMBLY. Refer to REMOVAL [08/2023 - ]

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR