Hummer 12576519 Sensor,Camshaft Position

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To replace the CMP sensor, disconnect the electrical connector from the sensor. For inline engines, the sensor is located at the right front corner of the cylinder head. For five-cylinder engines, the intake CMP sensor is located near the front engine lifting bracket. Remove the camshaft position sensor mounting bolt and withdraw the sensor from the cylinder head. Installation is the reverse of removal. Make sure to install a new O-ring on the sensor before installation and lubricate the O-ring with engine oil.

The exhaust CMP sensor produces a signal pulse four times every exhaust camshaft revolution in a four-cylinder engine or five times in a five-cylinder engine.

The replacement process for V8 models is similar to that of six-cylinder models. It involves disconnecting the electrical connector from the sensor, removing the camshaft position sensor mounting bolt, and withdrawing the sensor from the engine block.