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How to Install a Northstar Crank Position Sensor

The crank position sensor in a General Motors Northstar engine is part of the sensing and diagnostic system that is controlled by the powertrain control module (PCM). The crank position sensor sends information to the PCM about the position of the crankshaft relative to the engine block. The PCM uses this information to determine when to actuate specific electronic components, such as the ignition. When the crank sensor fails, the engine will not start. Replacement sensors are available from Cadillac dealerships and local auto parts stores.

Instructions

1

Place the vehicles transmission in the park or "P" position. Shut down the engine and set the parking brake. Let the vehicle cool for at least 60 minutes before proceeding.

2

Open the hood and disconnect the negative battery lead using a battery terminal wrench.

3

Locate the crank position sensor on right side of the engine block, approximately three inches above the oil filter housing. It is made from black plastic and is connected to the engine with a 10 mm bolt.

4

Depress the locking tab on the sensors electrical connector and unplug the connector from the sensor. Remove the bolt holding the sensor to the engine, using a 3/8-inch ratchet and a 10 mm socket. Grip the sensor with a slip-joint pliers and gently remove it using a twisting/pulling motion.

5

Lubricate the new crank sensor with a small amount of clean engine oil. Install the new sensor into the engine block using a twisting/pushing motion. Reinstall the sensors retaining bolt and reattach its electrical connector.

6

Reconnect the negative battery lead. Start the engine and verify that it operates properly. The engine should start within three seconds of cranking and run smoothly.