Car encyclopedia

Crankshaft Position Sensor Replacement

The crankshaft position sensor tells the powertrain computer (PCM) the rotational speed of the crankshaft. This information is used to control ignition timing and fuel delivery. When replacing the crankshaft sensor, make sure that there are no obvious oil or coolant leaks that could ruin the new sensor.

How to Replace the Crankshaft Position Sensor

Note: There are two common locations for the crankshaft position sensor. These are general summaries of how to replace each type.

A. The sensor is located in the bell housing, close to the flywheel

1. Disconnect the negative battery terminal
2. Remove the electrical connector to the crankshaft position sensor
3. Remove the holding fastener and the sensor
4. Clean the hole where the old sensor was located
5. Install the new sensor in the same position
6. Tighten the fastener and reconnect the electrical connector and negative battery terminal
7. Clear any PCM codes and perform a Drive Cycle Test Drive to verify the repair

B. The sensor is located on the front of the engine, near the crankshaft pulley

1. Disconnect the negative battery terminal
2. Remove the drive belts in order to gain access to the sensor
3. On some engines, the crankshaft pulley and timing cover need to be removed for access
3. Disconnect the electrical connector, loosen the fastener, and remove the old sensor
4. Clean the mounting area of the old sensor
5. Install the new sensor, tighten the fastener, and connect the electrical connector
6. Install the belts and other removed components
7. Connect the negative battery terminal
8. Clear any PCM codes and perform a Drive Cycle Test Drive to verify the repair

Note: After replacing the crankshaft position sensor, the PCM needs to have the crankshaft adaption reset. This is so the PCM can recalibrate itself to the new crankshaft position sensor.

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