LeSabre V6-3.8L VIN K (1996)
Crankshaft Position Sensor: Testing and Inspection
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The dual Hall-effect crankshaft position sensor is the most critical part of the ignition system. If the sensor is damaged so that the CKP 18X or
CKP Sync crank sensor pulses are not generated, the engine will not start!
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There are 4 circuit wires connecting the dual crankshaft position sensor to the ignition control module If there is a problem with any of the four,
the engine will not start (no spark and no injector pulses). The circuits are described as follows:
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The 10 to 12 volt sensor feed for the Hall effect switches from the ignition control module.
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The CKP 18X pulse signal to the ignition control module.
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The CKP Sync pulse signal to the ignition control module.
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The sensor ground circuit for both Hall-effect switches.
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If the CKP Sync pulses stop while the engine is running, the engine will keep running. However, it will not restart after being shut OFF.
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If the CKP 18X pulses stop while the engine is running, the engine will stop running and will not restart.
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If a crankshaft position sensor assembly is replaced, check the crankshaft balancer interrupter rings for any blades being bent. If this is not checked
closely and a bent blade exists, the new crankshaft position sensor can be destroyed by the bent blade with only one crankshaft revolution!
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Crankshaft position sensor clearance is very important! The sensor must not contact the rotating interrupter rings at any time, or sensor damage
will result. If the balancer interrupter rings are bent, the interrupter ring blades will destroy the sensor.
