Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2005 Scion tC AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Coolant Temperature Sensor (2AZ-FE): Replacement

NOTE: When disconnecting the battery terminal, initialize the following system after the terminal is reconnected.

SYSTEM SPECIFICATIONS

System	Refer To
Power window control system	INITIALIZATION
Sliding roof system	INITIALIZATION

DRAIN ENGINE COOLANT (see ENGINE COOLANT (2AZ-FE) )
DISCONNECT BATTERY NEGATIVE TERMINAL
REMOVE ENGINE COOLANT TEMPERATURE SENSOR
1. Disconnect the engine coolant temperature sensor connector.
2. Using SST, remove the engine coolant temperature sensor and gasket.
  1. SST 09817-33190
  Fig 1: Removing Engine Coolant Temperature Sensor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSTALL ENGINE COOLANT TEMPERATURE SENSOR
1. Install a new gasket onto the engine coolant temperature sensor.
2. Using SST, install the engine coolant temperature sensor.
  1. SST 09817-33190
  2. Torque: 19.6 N.m (200 kgf.cm, 14 ft.lbf)
3. Connect the engine coolant temperature sensor connector.
  
  Fig 2: Connecting Engine Coolant Temperature Sensor Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CONNECT BATTERY NEGATIVE TERMINAL
1. Torque: 5.4 N.m (55 kgf.cm, 48 in.lbf)
ADD ENGINE COOLANT (see ENGINE COOLANT (2AZ-FE) )
CHECK FOR ENGINE COOLANT LEAKAGE (see COOLING SYSTEM (2AZ-FE) )

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.

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