DTC P00B1-11: Radiator Coolant Temperature Sensor Circuit Short to Ground [10/2022 - ]: 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.
- READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS)
Pre-procedure1
- Disconnect the No. 2 engine coolant temperature sensor connector.
*1 No. 2 Engine Coolant Temperature Sensor *2 ECM - Turn the ignition switch to ON.
- According to the display on the GTS, read the Data List.
Powertrain > Engine > Data List
Tester Display Radiator Coolant Temperature Result
Result Proceed to The value of Radiator Coolant Temperature is -40 °C A None of the above conditions are met B HINT:
-40°C (-40°F)
Post-procedure1
- None.
Result:
A
REPLACE NO. 2 ENGINE COOLANT TEMPERATURE SENSOR. Refer to REMOVAL [10/2022 - 08/2023] , or refer to REMOVAL [08/2023 - ]
Result:
B
See step 2
- Disconnect the No. 2 engine coolant temperature sensor connector.
- CHECK HARNESS AND CONNECTOR (NO. 2 ENGINE COOLANT TEMPERATURE SENSOR - ECM)
Pre-procedure1
- Disconnect the No. 2 engine coolant temperature sensor 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 A121-2 (THW3) or B28-129 (THTW) - 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 [10/2022 - 08/2023] , or refer to REMOVAL [08/2023 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR