Page 247 - Foton Workshop Manual - Aumark (BJ1099)

ENGINE CONTROL SYSTEM - COOLANT TEMPERATURE SENSOR 11-21
COOLANT TEMPERATURE SENSOR

1. Principle of work
Inside the coolant temperature sensor, there is a NTC thermistor which converts
temperature signal to electrical signal and inputs to ECM. The higher the
temperature is, the smaller the resistance value will be.
2. Function and installation
The water temperature sensor assembly is used to monitor the temperature of
engine coolant so as to correct the oil injection and ignition based on this; Pins: Pin 11
A outputs signal; Pin B connects the temperature display of instrument controller
board; Plate temperature display; Pin C connects the ground.
Install water temperature sensor assembly to discharging tube connector, and
insert copper thermal conductive sleeve to coolant. The sleeve has thread. Applying
243 sealant to thread before installation, you can conveniently screw in the water
temperature sensor assembly to the threaded hole on discharging tube connector.
3. Fault phenomenon and judgment method
(a). Fault phenomenon: Starting difficulty, etc..
(b). General causes for faults:
Man-made fault (such as thread failure).
(c). Precautions for maintenance:
Removing sensor under warm-up condition is prohibited.

Page 247