INEFFECTIVE CRANKSHAFT SENSOR REPLACE-OIL ON SENSOR-W/(DIS)

MODELS AFFECTED: 1988 CIMARRONS

This bulletin describes diagnosis guidelines for the crankshaft sensor.

1. Oil in the Sensor

The sensor should be replaced only if diagnosis procedures from the Service Manual or CAMS indicates that the sensor is faulty. Do not replace the crankshaft sensor because oil is found in the sensor. Oil in the crankshaft sensor will not cause an operational condition.

2. Oil Leak Through the Sensor

The sensor should be replaced if an external engine oilleak through the sensor is the complaint condition.

3. Intermittent Sensor Connection

The most likely cause for a crankshaft sensor related performance condition is an intermittent connection to the sensor. Replacing the crankshaft sensor may repair the condition for a period of time; however, the vehicle could return with the same customer complaint at a later date. Therefore, prior to replacing a sensor check the wire harness connector to the crankshaft sensor for proper contact. The wire terminals or the connector body itself may be replaced if necessary.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.