Hyundai_Tucson_2005

Crankshaft Position (CKP) Sensor

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Location



The crankshaft position sensor is located on the driver-s side of the vehicle, down by the lower radiator hose.

Operation



The crankshaft position 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 PCM 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 PCM identifies which cylinder is at TDC.

Removal & Installation



  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the connector from the sensor.
  4.  
  5. Remove the bolt that retains the sensor in place.
  6.  
  7. Remove the sensor from its mounting.
  8.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  
  3. Clearance between the sensor and the sensor wheel should be 0.020-0.059 inch.
  4.  

Testing



2.0L Engine
  1. Be sure that the CKPS and PCM connectors are connected.
  2.  
  3. Set up an oscilloscope as follows: Channel A (+): terminal 2 of the CKPS, (-): ground. Channel B (+): terminal 2 of the CMPS, (-): ground.
  4.  
  5. Start the engine and check for signal waveform (whether synchronize with camshaft sensor or not and tooth is missing).
  6.  
  7. Readings are as follows: The square wave signal should be smooth and without distortion.
  8.  
  9. Readings are as follows: The CMPS 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 poor connection between the PCM 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. Air gap is 0.012-0.067 inch. Measure from the distance of the housing to 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.
  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 problem corrected replace the sensor.
  20.  

2.7L Engine
  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 specification is normal, check for poor connection between the ECM and the components.
  10.  
  11. If specification is not normal, remove the sensor and calculate the air gap between the sensor and the flywheel/torque converter.
  12.  
  13. Air gap is 0.012-0.067 inch. Measure from the distance of the housing to 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.
  14.  
  15. Check the sensor for contamination, deterioration or damage.
  16.  
  17. Substitute the sensor with a known good component, check for proper operation. If problem corrected replace the sensor.
  18.  

 
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