Kia_Sephia_Rio_Spectra_Optima_1998-2006

Crankshaft Position (CKP) Sensor

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Location



On 2001-2005 vehicles the crankshaft sensor is mounted on the front of the transmission case adjacent to the flywheel. On 2006 vehicles the crankshaft position sensor is located next to the radiator hose inlet and outlet assembly.

Operation



The crankshaft position sensor consists of a magnet and coil. The voltage signal from the sensor is relayed to the ECM to indicate engine rpm and the position of the crankshaft.

On 2001-2005 vehicles the 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 and one longer slot on the target wheel. When the slot in the wheel aligns with the sensor, the sensor voltage output is low (approximately 0 volts). It is high (approximately 5 volts) when a slot is not aligned with the sensor. The ECM calculates the frequency to compute engine rpm to determine the injection duration and ignition timing. On 2006 vehicles the crankshaft position sensor consists of a magnet and coil. The voltage signal from the sensor is relayed to the ECM to indicate engine rpm and the position of the crankshaft.

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.  

  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.  

  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 the transmission cover
  8.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  

Testing



  1. Properly connect the scan tool.
  2.  
  3. Start the engine and allow it to idle.
  4.  
  5. Be sure the idle position switch is ON.
  6.  
  7. Specifications are as follows:

    Temperature - 4°F, test specification 1500-1700 RPM
     
    Temperature 32°F, test specification 1350-1550 RPM
     
    Temperature 68°F, test specification 1200-1400 RPM
     
    Temperature 104°F, test specification 1000-1200 RPM
     
    Temperature 176°F, test specification 650-850 RPM
     

  8.  
  9. Replace sensor, as required.
  10.  

2000-2003
  1. Measure the gap between the sensor and the target wheel.
  2.  
  3. Specification should be 0.037-0.067 inch.
  4.  
  5. If the gap is within specification, install a known good sensor and recheck. Replace the sensor, as required.
  6.  
  7. If the gap is not within specification, check the target wheel for proper installation. Adjust the target wheel gap.
  8.  

2001-2005
  1. Measure the gap between the sensor and the target wheel.
  2.  
  3. Specification should be 0.012-0.067 inch.
  4.  
  5. If the gap is within specification, install a known good sensor and recheck. Replace the sensor, as required.
  6.  
  7. If the gap is not within specification, check the target wheel for proper installation. Adjust the target wheel gap.
  8.  

2004-2005
  1. Be sure the ignition switch is in the OFF position.
  2.  
  3. Disconnect the sensor connector.
  4.  
  5. Remove the sensor from the engine.
  6.  
  7. Apply battery voltage to terminal 1 and 5 volts to terminal 2. Ground terminal 3 of the CKPS.
  8.  
  9. Install an LED between plus 5 volt power and CMPS terminal 2 and a steel wheel-tooth wheel (or anything made of steel) at the CMPS tip.
  10.  
  11. Rotate the steel wheel slowly and check if the LED light flashes.
  12.  
  13. If the LED flashes, the sensor is working.
  14.  
  15. Replace the sensor, as required.
  16.  

2006
  1. Connect a scan tool.
  2.  
  3. Be sure the ignition is ON. Do not disconnect the sensors.
  4.  
  5. Select VEHICLE SCOPEMETER in the menu, and connect channel A of the scan tool with terminal 1 of the sensor harness connector.
  6.  
  7. Start the engine. Check the signal waveforms.
  8.  
  9. If they are within specification, substitute a known good ECM/PCM and recheck. Replace the component as required.
  10.  
  11. If not within specification, substitute a known good sensor and recheck. Replace the component as required.
  12.  

  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 a signal waveform and whether synchronization with CMPS has occurred or not and a tooth is missing.
  6.  
  7. Specification should be as follows. The square waveform signal should be smooth and without distortion. The CMPS falling (rising) edge is coincided with 3-5 tooth of the CKP from one longer signal (missing tooth).
  8.  
  9. If the waveform pattern is normal check for proper connection between the PCM and the component.
  10.  
  11. If the waveform signal is not normal, remove the sensor and measure the distance from the housing to teeth on the flywheel/torque converter (measurement A) and from the mounting surface on the sensor to the sensor tip (measurement B). Subtract B from A, specification should be 0.012-0.067 inch.
  12.  
  13. Recheck for proper operation. If the problem is corrected, replace the sensor.
  14.  

 
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