ON-VEHICLE SERVICE
Engine Coolant Temperature Sensor
Description
The Engine Coolant Temperature (ECT) sensor threads into the coolant outlet connector. The ECT sensor is a neg-
ative thermal coefficient sensor.
Operation
The ECT provides an input to the Engine Control Module (ECM). As temperature increases, resistance of the sensor
decreases. As coolant temperature varies, the ECT sensor resistance changes resulting in a different voltage value
at the ECT sensor signal circuit. The ECM uses the input to control air-fuel mixture, timing, and radiator fan on/off
times.
Removal & Installation
WARNING!
Always allow the engine to cool before opening the cooling system. Do not unscrew the coolant pressure relief
cap when the engine is operating or the cooling system is hot. The cooling system is under pressure; steam and
hot liquid can come out forcefully when the cap is loosened slightly. Failure to follow these instructions may
result in serious personal injury.
1. Disconnect the negative battery cable.
2. Drain the cooling system (See Cooling System Draining Procedure in Section 06 Cooling System).
3. Disconnect the coolant temperature sensor electri-
cal connector.
CAUTION:
Remove the coolant temperature sensor when
the engine is cold.
4. Remove the engine coolant temperature sensor
(1).
(Tighten: Engine coolant temperature sensor to 20
N·m)
5. Discard the O-ring.
6. Installation is in the reverse order of removal.
Installation Notes:
• After installing the ECT sensor, verify the cooling
system is filled to proper specifications.
PZSM030012
03
03–169
Chery Automobile Co., Ltd.
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