Chrysler Concorde/Intrepid/LHS/New Yorker/Vision 1993-1997

Camshaft Position Sensor (CPS)

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OPERATION



See Figures 1 and 2



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Fig. Fig. 1: The camshaft sprocket with gear cylinder numbering-3.3L engine



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Fig. Fig. 2: The camshaft sprocket with gear cylinder numbering-3.5L engine

The CPS provides cylinder identification to the PCM. The sensor generates pulses as groups of notches on the camshaft sprocket pass underneath it. The PCM keeps track of the crankshaft rotation and identifies each cylinder by the pulses generated by the notches on the camshaft sprocket. Four crankshaft pulses follow each group of camshaft pulses.

When the PCM receives two camshaft pulses followed by the long flat spot on the camshaft sprocket, it knows that the crankshaft timing marks for cylinder one are next (on the drive plate). When the PCM receives one camshaft pulse after the long flat spot on the sprocket, cylinder No. 2 crankshaft timing marks are next. After three camshaft pulses, the PCM knows cylinder four crankshaft timing marks follow. One camshaft pulse after the three pulses indicates cylinder five. The two camshaft pulses after cylinder No. 5 signals cylinder No. 6. The PCM can synchronize on cylinders No. 1 or No. 4.

When metal aligns with the sensor, voltage goes low (less than 0.3 volts). When a notch aligns with the sensor, voltage spikes high (5.0 volts). As a groups of notches pass under the sensor, the voltage switches from low to high then back to low again. The number of notches determine the amount of pulses. If available, an oscilloscope can display the square wave patterns of each timing event.

Top Dead Center (TDC) does not occur when notches on the camshaft sprocket pass below the sensor. TDC occurs after the camshaft pulse (or pulses) and after the 4 crankshaft pulses associated with the particular cylinder. The arrows and cylinder call in the illustration represent which cylinder the flat spot and notches identify, they do not indicate the TDC position.

The camshaft position sensor is mounted to the top of the timing case cover. The bottom of the sensor is positioned above the camshaft sprocket.

The distance between the bottom of sensor and the camshaft sprocket is critical to the operation of the system.

TESTING

See Figures 3, 4, 5 and 6



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Fig. Fig. 3: Camshaft position sensor pin terminal ID-1993 3.3L engine



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Fig. Fig. 4: Camshaft position sensor pin terminal ID-1994-95 3.3L engine



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Fig. Fig. 5: Camshaft position sensor pin terminal ID-3.5L engine



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Fig. Fig. 6: Camshaft position sensor pin terminal ID-1996-97 models

Before testing any electrical component, inspect the wiring and connectors for damage. Also wiggle the connectors to ensure a that they are firmly engaged. For this procedure a dwell meter, or the equivalent, will be needed.

  1. Unplug the Camshaft Position Sensor (CPS) connector.
  2.  
  3. Turn the ignition ON .
  4.  
  5. Using a voltmeter, measure the voltage from the wiring harness connector 8-volt supply circuit (orange wire) to ground.
    1. If the voltage is 8-9.5 volts, skip to the next step.
    2.  
    3. If the voltage measured is lower than 8 volts, or greater than 9.5 volts, the CPS is not receiving the correct current to function properly. There is a problem in the wiring or related components.
    4.  

  6.  
  7. Turn the ignition OFF .
  8.  
  9. Attach the CPS wiring and engine wiring harness connectors back together.
  10.  
  11. Attach a dwell meter to the battery. Attach the lead probe of the dwell meter to the sensor signal wire (light blue wire with dark blue tracer) by backprobing the connector or by using jumper cables between the terminals. Refer to the accompanying wiring illustration.
  12.  
  13. Place the dwell meter out of the way of any moving components of the engine, and in a position in which it can be seen once the engine is started.
  14.  
  15. Turn the engine ON .
  16.  
  17. Watch the dwell meter for one or two minutes while the engine is idling. The dwell time shown should be a steady 49-51%. If there is any fluctuation, or the dwell time is not 49-51% the CPS is defective and must be replaced with a new one.
  18.  

REMOVAL & INSTALLATION



3.3L Engine

See Figures 7, 8, 9, 10 and 11



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Fig. Fig. 7: The camshaft position sensor is directly under the upper radiator hose near the thermostat housing-3.3L engine



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Fig. Fig. 8: Remove the electrical connection leading to the camshaft position sensor-3.3L shown



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Fig. Fig. 9: Remove the one retaining bolt ...



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Fig. Fig. 10: ... then pull the sensor out of the timing case cover



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Fig. Fig. 11: Be sure the O-ring is positioned correctly in the groove of the sensor

The camshaft position sensor is mounted in the front of the timing case cover.

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the electrical wiring to the sensor.
  4.  
  5. Remove the camshaft position sensor mounting screw.
  6.  
  7. Pull the sensor up and out of the timing chain case cover.
  8.  

To install:

If the old sensor is being reinstalled, clean off the old spacer on the sensor face. A new spacer must be attached to the face before installation.

  1. If the sensor is bring replaced, confirm that the proper spacer is attached to the face and a new O-ring is positioned in the groove of the new sensor.
  2.  
  3. Install the sensor in the chain case cover, then push the sensor down until it contacts the camshaft sprocket. While holding the sensor in this position, install and tighten the retaining screw to 105 inch lbs. (12 Nm).
  4.  
  5. Attach the electrical wiring to the sensor.
  6.  
  7. Connect the negative battery cable.
  8.  

3.5L Engine

See Figures 12 and 13



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Fig. Fig. 12: The camshaft position sensor is installed in the timing case cover above the left camshaft sprocket-3.5L engine



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Fig. Fig. 13: The paper spacer is located on the end of the sensor-3.5L engine

The camshaft position sensor is installed in the timing case cover above the left camshaft sprocket.

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the electrical wiring to the sensor.
  4.  
  5. Remove the camshaft position sensor mounting screw.
  6.  
  7. Pull the sensor up and out of the timing chain case cover.
  8.  

To install:

If the old sensor is being reinstalled, clean off the old spacer on the sensor face. A new spacer must be attached to the face before installation.

  1. If the sensor is bring replaced, confirm that the proper spacer is attached to the face and a new O-ring is positioned in the groove of the new sensor.
  2.  
  3. Install the sensor in the chain case cover, then push the sensor down until it contacts the camshaft sprocket. While holding the sensor in this position, install and tighten the retaining screw to 105 inch lbs. (12 Nm).
  4.  
  5. Attach the electrical wiring to the sensor.
  6.  
  7. Connect the negative battery cable.
  8.  

 
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