Test 10 - Crank Angle Sensor Testing
CRANK ANGLE SENSOR TESTSystem 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 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 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. If voltmeter readings are not as specified disconnect the distributor connector and check that terminal 3 has near battery voltage with the ignition key in the ON position and that terminal 2 has very low resistance to ground. If power and grounds test properly and there is still no crank angle signal, replace the sensor. If test are passed check the top dead center sensor.