Engine Coolant Temperature (ECT) Sensor

GENERAL INFORMATION

Engine Coolant Temperature Sensor

1. ELECTRICAL CONNECTOR

2. RETAINING TAB

3. SENSOR

The ECT sensor is installed in the engine cooling system. The ECT sensor uses a thermistor,

which changes its electrical resistance depending on temperature. At low coolant temperature (–40°C), the thermistor resistance is approximately 100 kOhm, and at high temperature (130°C) only 70 Ohm. The ECU supplies the ECT circuit with a constant reference voltage through a series

connected resistor. The ECT signal voltage is high when the engine

is cold and decreases as the engine warms up. From the ECT signal voltage, the ECU determines engine temperature, which is used to control many engine systems and components. If the ECT circuit fails, the ECU sets fault code

14 and stores it in memory. To correct the fault, it is necessary to

perform diagnostics and repair the wiring or replace the sensor..

Handle the ECT sensor with care! Damage to the ECT sensor will cause

Warning.

abnormal operation of the fuel injection system..

1. Relieve the pressure in the cooling system..

Remove or disconnect:

PROCEDURE.

3. Electrical connector..

2. Negative battery cable..

4. Carefully unscrew the ECT sensor..

1. Apply sealant P/N 1052080 or equivalent to the threads..

Installation

PROCEDURE.

1. Apply sealant P/N 1052080 or equivalent to the threads..

2. Screw the DTJ into the socket. Tighten the DTJ to torque 30 N·m..

4. Carefully unscrew the ECT sensor..

5. Add coolant and bring its level to the specified level.

Intake Air Temperature (IAT) Sensor (Intake Manifold)