Tucson 2006-2008

Crankshaft Position Sensor

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Component Inspection



Specific to:

Hyundai Tucson 2006-2008

With a scan tool, check the signal waveform of the Crankshaft Position (CKP) and the Camshaft Position (CMP) sensor. The waveform should appear as the following illustration.

Click image to see an enlarged view

Fig. Waveform graph of the CKP and the CMP sensors

Operation



Specific to:

Hyundai Tucson 2006-2008

The Crankshaft Position (CKP) sensor is a Hall Effect type sensor that generates voltage using a sensor and a target wheel mounted on the crankshaft. There are 58 slots in the target wheel where one is longer than the others. When the slot in the wheel aligns with the sensor, the sensor voltage output is low. When the metal tooth in the wheel aligns the sensor, the sensor voltage is high. During one crankshaft rotation there are 58 rectangular signals and one longer signal. The ECM calculates engine RPM by using the sensor-s signal and controls the injection duration and ignition timing. Using the signal differences caused by the longer slot, the ECM identifies which cylinder is at TDC.

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 sensor.
  6.  
  7. Remove the bolt that retains the sensor in place.
  8.  
  9. Remove the sensor from its mounting.
  10.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  
  3. Tighten the sensor retaining bolt to: 70-104 inch lbs. (8-12 Nm).
  4.  
  5. Clearance between the sensor and the sensor wheel should be 0.020-0.059 inch.
  6.  

Testing



2.0L Engine

Specific to:

Hyundai Tucson 2006-2008

  1. Be sure that the CKP and ECM connectors are connected.
  2.  
  3. Set up an oscilloscope as follows:
    1. Channel A (+) to terminal 2 of the CKP, (-) to ground.
    2.  
    3. Channel B (+) to terminal 2 of the CMP, (-) to ground.
    4.  

  4.  
  5. Start the engine and check the signal waveform. Check whether the waveform synchronizes with the camshaft sensor or not and a tooth is missing.
  6.  
  7. The square wave signal should be smooth and without distortion.
  8.  
  9. The CMP falling (rising) edge should coincide with 3-5 tooth of the CKP from one longer signal (missing tooth).
  10.  
  11. If the waveform signal is normal, check for a poor connection between the ECM and the components.
  12.  
  13. If the waveform signal is not normal, remove the sensor and calculate the air gap between the sensor and the flywheel/torque converter.
  14.  
  15. The air gap should be 0.012-0.067 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 the sensor tip (measurement -B-), then subtract -B- from -A-.
  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.  

2.7L Engine

Specific to:

Hyundai Tucson 2006-2008

  1. Connect the Hi-Scan tool to the data link connector.
  2.  
  3. Start the engine and let it idle.
  4.  
  5. Monitor -CKP T/WHEELS-LO CMP- and -CKP T/WHEELS-HI CMP- parameters on the scan tool data list.
  6.  
  7. Specification should be -CKP T/WHEELS-LO CMP-: 38 plus/minus 4 tooth, and -CKP T/WHEELS-HI CMP-: 98 plus/minus 4 tooth.
  8.  
  9. If the reading is normal, check for a poor connection between the ECM and the components.
  10.  
  11. If the reading is not normal, remove the sensor and calculate the air gap between the sensor and the flywheel/torque converter.
  12.  
  13. The air gap should be 0.012-0.067 inch. Measure from the distance of the housing to the teeth on the flywheel/torque converter (measurement -A-) and from the mounting surface on the sensor to the sensor tip (measurement -B-), then subtract -B- from -A-.
  14.  
  15. Check the sensor for contamination, deterioration, or damage.
  16.  
  17. Substitute the sensor with a known good component and check for proper operation. If the problem is corrected, replace the sensor.
  18.  

 
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