The camshaft position sensor (CMP) is used by the powertrain control module (PCM) to determine the position of the camshaft in relation to the crankshaft. The PCM uses this information for fuel injector control, and in some cases, ignition system control. There are two basic types of camshaft sensors: Hall effect and magnetic reluctance. The Hall effect design has three wires going to it: reference, signal and ground. The PCM sends a reference DC voltage to the camshaft sensor and the sensor sends a return signal back to the PCM in accordance with camshaft position. On the other hand, the magnetic reluctance sensor has two wires and creates its own AC voltage when it passes by a reluctor wheel inside the engine.

Part 1 of 3: Locating and removing the camshaft position sensor

Materials Needed

  • Free repair manuals - Autozone provides free online repair manuals for certain makes and models
  • Protective gloves
  • Repair manuals (optional)
  • Safety glasses
  • Wrench or ratchet and sockets of the appropriate size

Step 1: Locate the sensor. The camshaft position sensor is generally mounted in the block or cylinder head, depending on engine design.

Step 2: Disconnect the negative battery cable. Disconnect the negative battery cable and set it aside.

Step 3: Remove the sensor electrical connector. Remove the electrical connector by pushing down on the tab and sliding it off.

Step 4: Remove the sensor mounting screw(s). Remove the sensor mounting screws using a wrench or ratchet and socket of of the appropriate size.

Step 5: Remove the sensor. Remove the sensor from the engine by pulling it straight out.

Part 2 of 2: Installing the new camshaft position sensor

Step 1: Install the new sensor. Push the sensor straight in and align the bolt flange with the mounting hole.

Step 2: Install the sensor mounting screws. Install the sensor mounting screws and tighten them down using a wrench or ratchet and socket of of the appropriate size.

Step 3: Reinstall the electrical connector.

Step 4: Reinstall the negative battery cable. Reconnect the negative terminal to the battery.

That’s what it takes to replace your camshaft position sensor. If this seems like something you’d prefer to leave to a professional, YourMechanic offers expert camshaft position sensor replacement.

This article originally appeared on YourMechanic.com as How to Replace a Camshaft Position Sensor and was authored by Mia Bevacqua.


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