OEM 2005 Toyota Prius Coolant Temperature Sensor

2005 Toyota Prius Parts Questions & Experts Answers

• Q: How to replace the coolant temperature sensor on 2005 Toyota Prius?

  A: Start the engine coolant temperature sensor replacement process by first taking steps for safety and then removing the radiator support opening cover together with engine under covers (LH and RH) and draining engine coolant and HV coolant fluids. Begin the sensor replacement by removing rear floor board No.2 and No.3 along with the deck floor box rear and cutting off the engine wire No.3 (battery negative terminal connection). Begin the service by taking out the service plug grip in addition to windshield wiper arm cover and front wiper arms (LH and RH). You need to remove also hood to cowl top seal and cowl top ventilator louvers (LH and RH). After removing the windshield wiper link assembly you should take out the cowl top panel sub assembly outer front along with the inverter cover. The technician must confirm the W/converter inverter assembly voltage level is at 0 V while performing the following disconnection sequence: inverter cooling hoses No.1, No.2, and No.6 along with removing circuit breaker sensor No.1 and disconnecting frame wire No.2. Use a deep socket wrench 19 mm to remove the sensor while disconnecting its connector. Pull out the W/converter inverter assembly and the engine coolant temperature sensor with their gasket. Connect the sensor after installing its new gasket and temperature sensor with a torque stay at 20 Nm (200 kgf.cm, 14 ft.lbf). Install the W/converter inverter assembly then link it to frame wire No.2 and circuit breaker sensor No.1 before connecting inverter cooling hoses in the order No.6 No.1 and No.2. Continue the process by reattaching the inverter cover followed by cowl top panel sub assembly outer front, windshield wiper link assembly, service plug grip and engine wire No.3 (battery negative terminal). Last, the technician will reinstall the cowl top ventilator louvers (both RH and LH) together with the hood to cowl top seal and front wiper arms (LH and RH) and windshield wiper arm cover. Following this, the rear floor boards No.3 and No.2 as well as the deck floor box rear and engine under covers (RH and LH) are installed. The technician ends the procedure by reinstalling the radiator support opening cover. Perform the final step of the process by starting the power window control system operation.