Coolant Temperature Sensor/Switch (For Computer): Service and Repair

DISASSEMBLY
1. Drain the coolant down to sensor level or below.
2. Disconnect the battery ground cable and disconnect the engine harness connector from the sender & sensor.
3. Remove the sender & sensor

INSPECTION

Coolant Temperature Sensor





1. Heat the sensor by submerging it in hot water.
2. Check that the resistance is within the specified range.

At 20°C (68°F): 2.21 - 2.69 K Ohms.
At 80°C (176°F): 290 - 354 Ohms

Coolant Temperature Sender





1. Heat the engine coolant temperature sender by submerging it in hot water.
2. Check that the resistance is within the specified range.

Resistance:
90.5 - 117 Ohms at 70°C (158°F)
21.3 - 26.3 Ohms at 115°C (239°F)

REASSEMBLY





1. Apply sealant to the threaded portion and tighten to the specified torque.

Tightening torque:
Coolant temperature sender: 10 - 12 Nm ( 100 - 120 kg.cm, 7 - 9 ft. lbs.)
Coolant temperature sensor: 15 - 20 Nm (150 - 200 kg.cm, 11 - 14 ft. lbs.)

2. Connect the harness connector to the coolant temperature sender and coolant temperature sensor.
3. Connect the battery to ground cable.
4. Refill the system with clean coolant.