Mirage L4-1597cc 1.6L DOHC Turbo (1989)
Crank Angle Sensor: Testing and Inspection
TDC Sensor
To test the Top Dead Center (TDC) Sensor, proceed as follows.
System Schematic
OSCILLOSCOPE TESTING PROCEDURE:
1.
Connect test leads from the oscilloscope to the #4 terminal of the sensor connector and run the engine at idle speed.
Scope Pattern
Check the waveform and compare it to the diagram shown.
VOLTAGE TESTING PROCEDURE:
1.
Connect a voltmeter between terminal 1 and 4 of the crank angle sensor connector.
Terminal 4: Top Dead Center (TDC) signal
Terminal 1: Sensor ground
2.
Measure the output voltage of the terminals while cranking the engine.
Standard Approximate Value
Terminal 4:
2.0 - 2.5v
3.
When the voltage is abnormal, check the sensor power and ground circuits.
