Test 10 - Controller Signal Output Testing

CRANK ANGLE SENSOR TEST




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

OSCILLOSCOPE TESTING PROCEDURE:

Distributor Connector:

1. Connect test leads from the oscilloscope to the Brown/Green wire of the distributor 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 the Brown/Green wire (+) and the Black Wire (-) of the distributor connector.
Brown/Green Wire: Crank angle signal
Black Wire: 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. If voltmeter readings are not as specified disconnect the distributor connector and check that the Black/White wire of the harness connector has near battery voltage with the ignition key in the ON position and that the Black wire of the distributor connector has very low resistance to ground. If power and grounds test properly and there is still no signal output, the problem is in either the Crank Angle sensor or the sensor circuit. If test is as specified, check power transistor.