Crankshaft Position Sensor

System Schematic:

To test the Crank Angle Sensor located in the distributor, proceed as follows

OSCILLOSCOPE TESTING PROCEDURE:

1. Connect test leads from the oscilloscope to the #1 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 1 and 2 of the crank angle sensor connector.
Terminal 1: Crank angle signal
Terminal 2: Sensor ground

2. Measure the output voltage of the terminals while cranking the engine.
Standard Approximate Values
Terminal 1: 1.8 - 2.5v (needle fluctuates)


3. When the voltage is abnormal, check the sensor power and ground circuits.

Refer to COMPUTERIZED ENGINE CONTROLS for further information.