Tucson 2006-2008

Camshaft Position Sensor

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Description & Operation



Specific to:

Hyundai Tucson 2006-2008

The Camshaft Position (CMP) sensor is triggered by a notched reluctor wheel built onto the camshaft sprocket. The CMP sensor is connected to the ECM by the following circuits:



A 5-volt circuit
 
A low reference circuit
 
A signal circuit
 

The CMP sensor is a Hall-effect sensor and detects the camshaft position by using a Hall element. It is related with the Crankshaft Position (CKP) sensor and detects the piston position of each cylinder which the CKP sensor can't detect. This sensor has a Hall-effect IC which changes in output voltage when a magnetic field is made on the IC with the current flow.

Removal & Installation



Specific to:

Hyundai Tucson 2006-2008

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Disconnect the connector from the CMP sensor.
  6.  
  7. Remove the bolt that retains the CMP sensor.
  8.  
  9. Remove the CMP sensor.
  10.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  
  3. Tighten the bolt that retains the CMP sensor to: 61-86 inch lbs. (7-10 Nm).
  4.  

Testing



2.0L Engine

Specific to:

Hyundai Tucson 2006-2008

During normal operation the ECM controls all ignition functions. If either the Crankshaft Position (CKP) or Camshaft Position (CMP) sensor signal is lost, the engine will continue to run because the ECM will default to a limp home mode using the remaining sensor input. Diagnostic trouble codes are available to accurately diagnose the ignition system with an OBD2 scan tool.

  1. Inspect the CMP sensor for correct installation. Remove the CMP sensor from the engine and inspect the sensor O-ring for damage. If the sensor is loose, incorrectly installed, or damaged, replace the CMP sensor.
  2.  
  3. Engage the CMP sensor harness connector to the CMP sensor.
  4.  
  5. Set up an oscilloscope as follows:
    1. Channel A (+) to terminal 2 of the CKPS, (-) to ground.
    2.  
    3. Channel B (+) to terminal 2 of the CMPS, (-) to ground.
    4.  

  6.  
  7. Start the engine and check the signal waveform. Check whether the waveform synchronizes with crankshaft sensor or not and a tooth is missing.
  8.  
  9. The square wave signal should be smooth and without distortion.
  10.  
  11. The CMPS falling (rising) edge should coincide with the 3-5 tooth of the CKP from one longer signal (missing tooth).
  12.  
  13. If the waveform signal is normal, check for a poor connection between the ECM and the components.
  14.  
  15. If the waveform signal is not normal, remove the sensor and calculate the air gap between the sensor and the flywheel/torque converter.
  16.  
  17. The air gap should be 0.07 inch. Measure the distance of the housing to the teeth on the flywheel/torque converter (measurement -A-) and from the mounting surface on the sensor to sensor tip (measurement -B-), then subtract -B- from -A-.
  18.  
  19. Check the sensor for contamination, deterioration, or damage.
  20.  
  21. Substitute the sensor with a known good component, check for proper operation. If the problem is corrected, replace the sensor.
  22.  

2.7L Engine

Specific to:

Hyundai Tucson 2006-2008

During normal operation the ECM controls all ignition functions. If either the Crankshaft Position (CKP) or Camshaft Position (CMP) sensor signal is lost, the engine will continue to run because the ECM will default to a limp home mode using the remaining sensor input. Diagnostic trouble codes are available to accurately diagnose the ignition system with an OBD2 scan tool.

  1. Inspect the CMP sensor for correct installation. Remove the CMP sensor from the engine and inspect the sensor O-ring for damage. If the sensor is loose, incorrectly installed, or damaged, replace the CMP sensor.
  2.  
  3. Engage the CMP sensor harness connector to the CMP sensor.
  4.  
  5. Connect the Hi-Scan tool to the data link connector.
  6.  
  7. Start the engine and let it idle.
  8.  
  9. Monitor -CKP T/WHEELS-LO CMP- and -CKP T/WHEELS-HI CMP- parameters on the scan tool data list.
  10.  
  11. The specification should be -CKP T/WHEELS-LO CMP-: 38 plus/minus 4 tooth, and -CKP T/WHEELS-HI CMP-: 98 plus/minus 4 tooth.
  12.  
  13. If the specification is normal, check for a poor connection between the ECM and the components.
  14.  
  15. If the specification is not normal, remove the sensor and calculate the air gap.
  16.  
  17. Check the sensor for contamination, deterioration, or damage.
  18.  
  19. Substitute the sensor with a known good component, check for proper operation. If the problem is corrected, replace the sensor.
  20.  

 
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