Laser FWD L4-1997cc 2.0L DOHC (1992)
Crankshaft Position Sensor: Testing and Inspection
Crank Angle Sensor Circuit
To test the Crank Angle Sensor located on the right side of the cylinder head, proceed as follows
OSCILLOSCOPE TESTING PROCEDURE:
1. Connect test leads from the oscilloscope to the #2 terminal of the sensor connector and run the engine at idle speed.
Scope Pattern
Check the waveform and compare it to the diagram shown.
If scope pattern is not as depicted in image, continue with the rest of the test procedures before replacing the assembly.
VOLTAGE TESTING PROCEDURE:
1. Connect a voltmeter between terminal 4 and 2 of the crank angle sensor connector.
Terminal 4: Crankshaft Position signal
Terminal 1: Sensor ground
2. Measure the output voltage of the terminals while cranking the engine.
Standard Approximate Values
1.8 - 2.5v (needle fluctuates)
3. When the voltage is abnormal, check the sensor power and ground circuits.
HARNESS TEST:
1. Disconnect the Crankshaft Position/Camshaft (TDC) sensor connector and turn the key to the ON position.
2. Using a voltmeter, measure the power supply voltage between the harness connector terminal 3 and ground.
Voltage:
System voltage.
3. Check for continuity between the Crankshaft Position/TDC sensor harness connector terminal 4 and ground.
