AutoZone 2006 Toyota Truck Tacoma XRunner 2WD 4.0L EFI DOHC 6cyl | Repair Guides | Engine Performance & Emission Controls | Components & Systems | Camshaft Position Sensor | AutoZone.com

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    Ford Ranger 2000-2005

    Camshaft Position Sensor

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    Description & Operation



    The CMP sensor provides the camshaft position information, called the CMP signal, which is used by the Powertrain Control Module (PCM) for fuel synchronization.


    NOTE
    1991-93 2.3L and 1991-95 4.0L (VIN X) engines did not use CMP sensors.

    1994 2.3L California only and 1995-99 2.3L and 2.5L engines utilize CMP sensors. The 1994 CMP is located on the oil pump drive assembly, on the left-hand lower side of the engine block. 1995-99 models CMP sensor is located and triggered by the auxiliary shaft drive sprocket.

    On the 1991-94 2.9L and 3.0L engine, the distributor stator is the Camshaft Position (CMP) sensor, and it is a Hall effect magnetic switch. On the 1995-99 3.0L engine, the CMP is mounted on the oil pump drive assembly, located towards the rear of the block. it is also a single hall effect magnetic switch and it is activated by a single vane, and is driven by the camshaft.

    Click image to see an enlarged view

    Fig. Camshaft Position (CMP) sensor used on the 2.3L and 2.5L engine-except 1994 California

    Camshaft Position (CMP) sensor used on the 2.3L and 2.5L engine-except 1994 California

    Click image to see an enlarged view

    Fig. Oil pump drive mounted CMP sensor used on 3.0L, 4.0L and 5.0L engines and 1994 California 2.3L engines

    Oil pump drive mounted CMP sensor used on 3.0L, 4.0L and 5.0L engines and 1994 California 2.3L engines

    On the 4.0L SOHC engine (VIN E), the Camshaft Position (CMP) sensor is a variable reluctance sensor, which is triggered by the high-point mark on the left-hand camshaft. It is mounted to the valve cover.

    The 4.0L and 5.0L engines use a separate CMP sensor mounted to the oil pump drive. The drive assembly is located toward the rear of the engine on the 4.0L, and towards the front on the 5.0L engine.

    Removal & Installation



    2.3L Engine
    1. Disconnect the negative battery cable.
    2.  
    3. Disconnect the vacuum hose from the intake manifold.
    4.  
    5. Disconnect the Camshaft Position Sensor (CMP) electrical connector.
    6.  
    7. Remove the bolt, the CMP sensor and discard the O-ring seal.
      NOTE
      Lubricate the new O-ring seal with clean engine oil prior to installation.

    8.  
    9. To install, reverse the removal procedure and note the following:
    10.  
    11. Tighten the CMP sensor mounting bolt to 62 inch. lbs. (7 Nm).
    12.  

    3.0L Engine
    1. Disconnect the negative battery cable.
    2.  
    3. Disconnect the Camshaft Position (CMP) sensor electrical connector.
    4.  
    5. Remove the 2 bolts and the CMP sensor.
    6.  
    7. To install, reverse the removal procedure and note the following:
    8.  
    9. Tighten the CMP sensor mounting bolt to 27 inch. lbs. (3 Nm).
    10.  

    4.0L Engine
    1. Disconnect the Camshaft Position (CMP) sensor electrical connector.
    2.  
    3. Remove the bolt, the CMP sensor and discard the O-ring seal.
      NOTE
      Lubricate the new O-ring seal with clean engine oil prior to installation.

    4.  
    5. To install, reverse the removal procedure and note the following:
    6.  
    7. Tighten the Mounting bolt to 71 inch. lbs. (8 Nm).
    8.  

    Testing



    Three Wire Sensors
    1. With the ignition OFF, disconnect the CMP sensor. With the ignition ON and the engine OFF, measure the voltage between sensor harness connector VPWR and PWR GND terminals (refer to the accompanying illustration). If the reading is greater than 10.5 volts, the power circuit to the sensor is okay.
    2.  
    3. With the ignition OFF, install break-out box between the CMP sensor and the PCM. Using a Digital Volt-Ohmmeter (DVOM) set to the voltage function (scale set to monitor less than 5 volts), measure voltage between break-out box terminals 24and 40with the engine running at varying RPM. If the voltage reading varies more than 0.1 volt, the sensor is okay.

      Click image to see an enlarged view

      Fig. CMP sensor wire harness connections for the 3-wire sensor

      CMP sensor wire harness connections for the 3-wire sensor
    4.  

    Two Wire Sensors
    1. With the ignition OFF, install a break-out box between the CMP sensor and PCM.
    2.  
    3. Using a Digital Volt-Ohmmeter (DVOM) set to the voltage function (scale set to monitor less than 5 volts), measure the voltage between break-out box terminals 24and 46with the engine running at varying RPM. If the voltage reading varies more than 0.1 volt AC, the sensor is okay.

      Click image to see an enlarged view

      Fig. CMP sensor wire harness connections for the 2-wire sensor

      CMP sensor wire harness connections for the 2-wire sensor
    4.  

     
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