Service manual

3. Phase Sensor
3.1 Function of the sensor:
Provide ECU with phase signal, i.e. help crankshaft position sensor of engine to judge it is then
at compressing top dead center or air exhaust top dead center.
3.2 Principle of the sensor:
The phase sensor is consisted of the Hall generator installed on the valve cover and the signal
wheel machined on the intake camshaft. When the camshaft rotates, the signal wheel will make the
magnetic flux passing the Hall generator change, thus generating a variable Hall signal.
3.3 Effects and judgment method:
l Failure effects: over proof emission and fuel consumption rise etc.
l General cause of the failure: man induced failure.
l Simple measurement method:
(connect the joint) switch on ignition switch but do not start the engine; put digital multimeter on DC
volt shift, connect two meter pen to No. 1 and No. 3 sensor connectors and make sure there is 12V
reference voltage. Start the engine, check if it is in good conditions of No.2 pin by oscillograph on
vehicle.
4. Water Temperature Sensor
4.1 Function of the sensor:
The water temperature sensor simultaneously provides ECU and instruments with water
temperature signal. ECU will calculate and regulate injection pulse-width and ignition advance angle
through water temperature signal. In addition, through water temperature signal, ECU also can
control turn-on and turn-off of cooling fan to prevent engine from damage caused by overheat.
4.2 Principle of the sensor:
The water temperature sensor is a minus temperature coefficient type electric resistance model
sensor; the higher the temperature is, the less the resistance will be. But, temperature rise and
resistance fall are not in linear relation.
Ground site
Phase sensor
87# pin of main relay