Kia_Sephia_Rio_Spectra_Optima_1998-2006

Camshaft Position (CMP) Sensor

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Description & Operation



The camshaft position sensor senses the TDC point of the number one cylinder, on its compression stroke. Its signal is relayed to the ECM to be used to determine the sequence of fuel injection.

On 2001-2005 vehicles, the sensor sends a signal to the ECM when the number one cylinder is at TDC. The sensor consists of a Hall Effect device and magnet. When the magnetic field of the Hall Effect device is interrupted by the half moon shape of the camshaft target wheel, the sensor voltage outputs 0 volts. If not, the sensor voltage outputs 5 volts. On 2006 vehicles the camshaft position sensor senses the TDC point of the number one cylinder, on its compression stroke. Its signal is relayed to the ECM to be used to determine the sequence of fuel injection.

The camshaft position sensor senses the TDC point of the number one cylinder, on its compression stroke. Its signal is relayed to the ECM to be used to determine the sequence of fuel injection.

Location



On 2001-2005 vehicles the camshaft position sensor is mounted at the rear of the cylinder head. On 2006 vehicles, the camshaft position sensor is located on top of the engine, on the engine head cover.

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.
  6.  
  7. Remove the sensor.
  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.
  6.  
  7. Remove the sensor.
  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 mounting bolts.
  6.  
  7. Remove the sensor, from the cylinder head.
  8.  

To install:

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

Testing



2000-2003
  1. Be sure the ignition switch is in the OFF position.
  2.  
  3. Disconnect the sensor connector.
  4.  
  5. Check for proper sensor installation.
  6.  
  7. If the sensor is installed properly, install a known good sensor and recheck. Replace the sensor, as required.
  8.  
  9. If the sensor is not installed properly, remove the sensor and reinstall it. Check for proper operation.
  10.  

2001-2003
  1. Connect the scan tool to the data link connector.
  2.  
  3. Start the engine. Allow the engine to reach operating temperature.
  4.  
  5. Monitor the CMPS signal. It should continuously fluctuate between 0-5 volts.
  6.  
  7. If abnormality is found, replace the sensor.
  8.  

2001-2005
  1. Disconnect the sensor and check half-moon installation.
  2.  
  3. If the half-moon wheel is installed properly, install a known good sensor and recheck. Replace the sensor, as required.
  4.  
  5. If the half-moon wheel is not installed properly, remove the camshaft and install the half-moon wheel correctly.
  6.  

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 on the CMPS.
  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.  

2004-2006
  1. Be sure that the CMPS and PCM connectors are connected.
  2.  
  3. Engine ON and monitor the signal waveform of the sensor on the scan tool. Check whether the waveform is synchronized with the crankshaft position sensor or not.
  4.  
  5. If the waveform signal is normal, substitute with a known good PCM and check for proper operation. If the problem is corrected replace the PCM.
  6.  
  7. If the waveform signal is not normal, substitute with a known good CMPS sensor and check for proper operation. If the problem is corrected replace the CMPS.
  8.  

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 2 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 CMPS 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 CKPS 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 calculate the air gap it should be 0.07 inch. Recheck for proper operation. If the problem is corrected, replace the sensor.
  12.  

 
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