GMC 12597253 Sensor Asm,Camshaft Position

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The Camshaft Position sensor works somewhat like the crankshaft position sensor. It functions together with the crankshaft position sensor to set up fuel injection timing for each cylinder. The replacement procedure for six-cylinder models includes the following steps: disconnecting the electrical connector from the sensor, removing the camshaft position sensor mounting bolt, and pulling out the sensor from the cylinder head. Installation is just taking it back as it was during removal. V8 models have similar processes. Remove the camshaft positioning-board mounting bolt by unplugging its electrical connector and pulling it off from the engine block. Once again, for installation, do exactly as was done during removal.

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.

On LH8 engines, the CMP sensor is mounted on the front of the timing chain cover.