D439E Service Manual 4. Fuel system
186
Coolant Temperature Sensor
Inspection
Engine coolant temperature sensor is a resistance
type sensor, which is installed on the engine coolant
passage of Intake manifold. Based on the output
voltage of this sensor, ECU determines the engine
temperature and supplies the optimal fuel quantity to
Injector when engine is cold.
Troubleshooting Hint
If the idle speed is not proper or the engine causes
smoke at warm up the engine coolant temperature
sensor is defective.
Harness Inspection Procedure
Refer to P0117, P0118, P0217 DTC inspection
procedures.
Sensor Inspection
Check items Data display
Checking
condition
Coolant
temperature
Specification
(Hi-scan)
-20℃ -20℃
0℃ 0℃
20℃ 20℃
40℃ 40℃
Coolant
temperature
sensor
Sensor
temperature
Ignition switch : ON
or engine is started
80℃ 80℃
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