Chrysler Neon 1995-1999 Repair Guide

Camshaft Position Sensor

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OPERATION



See Figures 1, 2, 3 and 4

The camshaft position sensor (along with the crankshaft position sensor) provides inputs to the PCM to determine fuel injection synchronization and cylinder identification. From these inputs, the PCM determines crankshaft position. The camshaft position sensor is attached to the rear of the cylinder head.



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Fig. Fig. 1: The camshaft position sensor is mounted to the rear of the cylinder head-SOHC engine shown



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Fig. Fig. 2: Location of the camshaft position sensor-DOHC engine shown

A target magnet attaches to the rear of the camshaft and indexes to the proper position. The target magnet has four different poles arranges in an asymmetrical pattern. As the target magnet rotates, the camshaft position sensor senses the change in polarity. The sensor output switches from high (5.0 volts) to low (0.5 volts) as the target magnet rotates. When the north pole of the target magnet passes under the sensor, the output switches high. The sensor output switches low when the south pole of the target magnet passes underneath. The sensor also acts as a thrust plate to control camshaft endplay.



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Fig. Fig. 3: There is a target magnet attached to the rear of the camshaft



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Fig. Fig. 4: View of the target magnet polarity

TESTING



See Figure 5

To test this sensor, you will need the use of an oscilloscope.

Visually check the connector, making sure it is attached properly and all of the terminals are straight, tight and free of corrosion.

The output voltage of a proper operating camshaft or crankshaft position sensor switches from high (5.0 volts) to low (0.3 volts). By connecting an oscilloscope to the sensor output circuit, you can view the square wave pattern produced by the voltage swing.



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Fig. Fig. 5: View of an oscilloscope's square wave pattern, in crankshaft degrees

REMOVAL & INSTALLATION



See Figures 1, 2, 6 and 7

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the filtered air tube from the throttle body and air cleaner housing.
  4.  
  5. For SOHC engines, remove the air cleaner inlet tube.
  6.  
  7. For SOHC engines, detach the electrical connectors from the engine coolant sensor and the camshaft position sensor.
  8.  
  9. For DOHC engines, unplug the electrical connector from the camshaft position sensor.
  10.  
  11. For SOHC engines, remove the brake booster hose and the electrical connectors form the holders on the end of the cylinder head cover.
  12.  
  13. Unfasten the camshaft position sensor mounting screws, then remove the sensor.
  14.  
  15. Loosen the screw/bolt attaching the target magnet to the rear of the camshaft.
  16.  



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Fig. Fig. 6: Unfasten the retaining bolt, then remove the target magnet from the rear of the camshaft-SOHC shown, DOHC similar

To install:

The target magnet has 2 locating dowels which fit into the machined locating holes in the end of the camshaft.



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Fig. Fig. 7: The target magnet has 2 locating dowels for proper alignment during installation

  1. Install the target magnet in the end of the camshaft. Tighten the retainer to 30 inch lbs. (3.4 Nm).
  2.  
  3. Install the camshaft position sensor. Tighten the sensor mounting screws to 80 inch lbs. (9 Nm).
  4.  
  5. For SOHC engines, place the brake booster hose and the electrical harness in the holders on the end of the valve cover.
  6.  
  7. Attach the electrical connector(s) to the camshaft position sensor and coolant temperature sensor (if necessary).
  8.  
  9. Install the air cleaner inlet tube and the filtered air tube.
  10.  
  11. Connect the negative battery cable.
  12.  

 
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