Mitsubishi Car 1999-05

Camshaft Position Sensor

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Description & Operation



The computer control module uses the Camshaft Position (CMP) sensor to determine the position of the No. 1 piston during its power stroke. This signal is used by the computer control module to calculate fuel injection mode of operation.

If the cam signal is lost while the engine is running, the fuel injection system will shift to a calculated fuel injected mode based on the last fuel injection pulse, and the engine will continue to run.

A 5-volt voltage is applied on the Camshaft Position (CMP) Sensor output terminal from the ECM/PCM. The sensor generates a pulse signal when the output terminal is opened and grounded.

A 5-volt voltage is applied on the Camshaft Position (CMP) Sensor output terminal from the ECM/PCM. The sensor generates a pulse signal when the output terminal is opened and grounded.

A 5-volt voltage is applied on the Camshaft Position (CMP) Sensor output terminal from the ECM/PCM. The sensor generates a pulse signal when the output terminal is opened and grounded.

A 5-volt voltage is applied on the Camshaft Position (CMP) Sensor output terminal from the ECM/PCM. The sensor generates a pulse signal when the output terminal is opened and grounded.

A 5-volt voltage is applied on the Camshaft Position (CMP) Sensor output terminal from the ECM/PCM. The sensor generates a pulse signal when the output terminal is opened and grounded.

A 5-volt voltage is applied on the Camshaft Position (CMP) Sensor output terminal from the ECM/PCM. The sensor generates a pulse signal when the output terminal is opened and grounded.

Removal & Installation



  1. Disconnect the negative battery cable.
  2.  
  3. Detach the sensor connector.
  4.  
  5. Unfasten the retaining bolt, then remove the sensor and the O-ring.
  6.  
  7. Installation is the reverse of the removal procedure.

    Click image to see an enlarged view

    Fig. Camshaft Position Sensor Removal & Installation

  8.  

  1. Disconnect the negative battery cable.
  2.  
  3. Detach the sensor connector.
  4.  
  5. Unfasten the retaining bolt, then remove the sensor and the O-ring.
  6.  
  7. Installation is the reverse of the removal procedure.

    Click image to see an enlarged view

    Fig. Camshaft Position Sensor Removal & Installation

  8.  

  1. Disconnect the negative battery cable.
  2.  
  3. Detach the sensor connector.
  4.  
  5. Unfasten the retaining bolt, then remove the sensor and the O-ring.
  6.  
  7. Installation is the reverse of the removal procedure.

    Click image to see an enlarged view

    Fig. Camshaft Position Sensor Removal & Installation

  8.  

  1. Disconnect the negative battery cable.
  2.  
  3. Detach the sensor connector.
  4.  
  5. Unfasten the retaining bolt, then remove the sensor and the O-ring.
  6.  
  7. Installation is the reverse of the removal procedure.

    Click image to see an enlarged view

    Fig. Camshaft Position Sensor Removal & Installation

  8.  

  1. Disconnect the negative battery cable.
  2.  
  3. Detach the sensor connector.
  4.  
  5. Unfasten the retaining bolt, then remove the sensor and the O-ring.
  6.  
  7. Installation is the reverse of the removal procedure.

    Click image to see an enlarged view

    Fig. Camshaft Position Sensor Removal & Installation

  8.  

  1. Disconnect the negative battery cable.
  2.  
  3. Detach the sensor connector.
  4.  
  5. Unfasten the retaining bolt, then remove the sensor and the O-ring.
  6.  
  7. Installation is the reverse of the removal procedure.

    Click image to see an enlarged view

    Fig. Camshaft Position Sensor Removal & Installation

  8.  

1.5L, 2.4L, 3.0L SOHC, 3.5L, And 1993-96 1.8L Engines


Click image to see an enlarged view

Fig. The CMP sensor is built into the distributor-1.8L engine shown

The camshaft position sensor on these engines is located in the distributor. Refer to the distributor removal and installation procedure in Section 2.

1.6L, 2.0L DOHC And 1997-00 1.8L Engines
  1. Disconnect the negative battery cable.
  2.  
  3. Detach the electrical throttle body stay.
  4.  
  5. Remove the sensor retaining screws.
  6.  
  7. Remove the sensor assembly from the engine.
  8.  

To install:

  1. Install the sensor in the opening in the engine and tighten the sensor retaining screws.
  2.  
  3. Install the throttle body stay.
  4.  
  5. Attach the electrical connector to the sensor.
  6.  
  7. Connect the negative battery cable.
  8.  

3.0L DOHC Engine


Click image to see an enlarged view

Fig. CMP sensor mounting-3.0L DOHC engine

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the timing belt, as outlined in Section 3 of this manual.
  4.  
  5. Unplug the sensor connector.
  6.  
  7. Unfasten the retaining bolts, then remove the sensor from the vehicle.
  8.  
  9. Installation is the reverse of the removal procedure.
  10.  

Testing



This sensor produces an A/C voltage signal based on information gathered while the engine is running. Testing the CMP sensor requires several special tools that are very expensive to purchase. Due to this fact, we have determined testing this sensor to be beyond the scope of the do-it-yourself mechanic. The sensor can be monitored with an appropriate scan tool using a data display or other data stream information. Follow the instructions included with the scan tool for information on accessing the data.

  1. Disconnect the sensor connector and measure at the harness side.
  2.  
  3. Turn the ignition switch to the "ON" position.
  4.  
  5. Measure the voltage between terminal No. 2 and ground. Voltage should be between 4.8 and 5.2 volts.
  6.  
  7. Turn the ignition switch to the "LOCK" (OFF) position.
  8.  
  9. If not within specifications, check connectors and wiring between the sensor and ECM/PCM. Repair/replace as necessary.
  10.  
  11. If within specifications, disconnect the sensor connector and measure at the harness side.
  12.  
  13. Turn the ignition switch to the "ON" position.
  14.  
  15. Measure the voltage between terminal No. 3 and ground. Voltage should be battery positive voltage.
  16.  
  17. Turn the ignition switch to the "LOCK" (OFF) position.
  18.  
  19. If not within specifications, check connectors and wiring between the sensor and MFI relay. Repair/replace as necessary.
  20.  
  21. If within specifications, disconnect the sensor connector and measure at the harness side.
  22.  
  23. Check for the resistance between terminal No. 1 and ground. Resistance should be less than 2 ohms.
  24.  
  25. If not within specifications, check connectors and wiring between the sensor and ECM/PCM. If connectors and wiring between sensor and ECM/PCM are good, replace the ECM/PCM.
  26.  
  27. If within specifications, check the camshaft position sensing cylinder. Repair if necessary.
  28.  
  29. If the camshaft position sensing cylinder in good, replace the CMP sensor.
  30.  

  1. Disconnect the sensor connector and measure at the harness side.
  2.  
  3. Turn the ignition switch to the "ON" position.
  4.  
  5. Measure the voltage between terminal No. 2 and ground. Voltage should be between 4.8 and 5.2 volts.
  6.  
  7. Turn the ignition switch to the "LOCK" (OFF) position.
  8.  
  9. If not within specifications, check connectors and wiring between the sensor and ECM/PCM. Repair/replace as necessary.
  10.  
  11. If within specifications, disconnect the sensor connector and measure at the harness side.
  12.  
  13. Turn the ignition switch to the "ON" position.
  14.  
  15. Measure the voltage between terminal No. 3 and ground. Voltage should be battery positive voltage.
  16.  
  17. Turn the ignition switch to the "LOCK" (OFF) position.
  18.  
  19. If not within specifications, check connectors and wiring between the sensor and MFI relay. Repair/replace as necessary.
  20.  
  21. If within specifications, disconnect the sensor connector and measure at the harness side.
  22.  
  23. Check for the resistance between terminal No. 1 and ground. Resistance should be less than 2 ohms.
  24.  
  25. If not within specifications, check connectors and wiring between the sensor and ECM/PCM. If connectors and wiring between sensor and ECM/PCM are good, replace the ECM/PCM.
  26.  
  27. If within specifications, check the camshaft position sensing cylinder. Repair if necessary.
  28.  
  29. If the camshaft position sensing cylinder in good, replace the CMP sensor.
  30.  

  1. Disconnect the sensor connector and measure at the harness side.
  2.  
  3. Turn the ignition switch to the "ON" position.
  4.  
  5. Measure the voltage between terminal No. 2 and ground. Voltage should be between 4.8 and 5.2 volts.
  6.  
  7. Turn the ignition switch to the "LOCK" (OFF) position.
  8.  
  9. If not within specifications, check connectors and wiring between the sensor and ECM/PCM. Repair/replace as necessary.
  10.  
  11. If within specifications, disconnect the sensor connector and measure at the harness side.
  12.  
  13. Turn the ignition switch to the "ON" position.
  14.  
  15. Measure the voltage between terminal No. 3 and ground. Voltage should be battery positive voltage.
  16.  
  17. Turn the ignition switch to the "LOCK" (OFF) position.
  18.  
  19. If not within specifications, check connectors and wiring between the sensor and MFI relay. Repair/replace as necessary.
  20.  
  21. If within specifications, disconnect the sensor connector and measure at the harness side.
  22.  
  23. Check for the resistance between terminal No. 1 and ground. Resistance should be less than 2 ohms.
  24.  
  25. If not within specifications, check connectors and wiring between the sensor and ECM/PCM. If connectors and wiring between sensor and ECM/PCM are good, replace the ECM/PCM.
  26.  
  27. If within specifications, check the camshaft position sensing cylinder. Repair if necessary.
  28.  
  29. If the camshaft position sensing cylinder in good, replace the CMP sensor.
  30.  

  1. Disconnect the sensor connector and measure at the harness side.
  2.  
  3. Turn the ignition switch to the "ON" position.
  4.  
  5. Measure the voltage between terminal No. 2 and ground. Voltage should be between 4.8 and 5.2 volts.
  6.  
  7. Turn the ignition switch to the "LOCK" (OFF) position.
  8.  
  9. If not within specifications, check connectors and wiring between the sensor and ECM/PCM. Repair/replace as necessary.
  10.  
  11. If within specifications, disconnect the sensor connector and measure at the harness side.
  12.  
  13. Turn the ignition switch to the "ON" position.
  14.  
  15. Measure the voltage between terminal No. 3 and ground. Voltage should be battery positive voltage.
  16.  
  17. Turn the ignition switch to the "LOCK" (OFF) position.
  18.  
  19. If not within specifications, check connectors and wiring between the sensor and MFI relay. Repair/replace as necessary.
  20.  
  21. If within specifications, disconnect the sensor connector and measure at the harness side.
  22.  
  23. Check for the resistance between terminal No. 1 and ground. Resistance should be less than 2 ohms.
  24.  
  25. If not within specifications, check connectors and wiring between the sensor and ECM/PCM. If connectors and wiring between sensor and ECM/PCM are good, replace the ECM/PCM.
  26.  
  27. If within specifications, check the camshaft position sensing cylinder. Repair if necessary.
  28.  
  29. If the camshaft position sensing cylinder in good, replace the CMP sensor.
  30.  

  1. Disconnect the sensor connector and measure at the harness side.
  2.  
  3. Turn the ignition switch to the "ON" position.
  4.  
  5. Measure the voltage between terminal No. 2 and ground. Voltage should be between 4.8 and 5.2 volts.
  6.  
  7. Turn the ignition switch to the "LOCK" (OFF) position.
  8.  
  9. If not within specifications, check connectors and wiring between the sensor and ECM/PCM. Repair/replace as necessary.
  10.  
  11. If within specifications, disconnect the sensor connector and measure at the harness side.
  12.  
  13. Turn the ignition switch to the "ON" position.
  14.  
  15. Measure the voltage between terminal No. 3 and ground. Voltage should be battery positive voltage.
  16.  
  17. Turn the ignition switch to the "LOCK" (OFF) position.
  18.  
  19. If not within specifications, check connectors and wiring between the sensor and MFI relay. Repair/replace as necessary.
  20.  
  21. If within specifications, disconnect the sensor connector and measure at the harness side.
  22.  
  23. Check for the resistance between terminal No. 1 and ground. Resistance should be less than 2 ohms.
  24.  
  25. If not within specifications, check connectors and wiring between the sensor and ECM/PCM. If connectors and wiring between sensor and ECM/PCM are good, replace the ECM/PCM.
  26.  
  27. If within specifications, check the camshaft position sensing cylinder. Repair if necessary.
  28.  
  29. If the camshaft position sensing cylinder in good, replace the CMP sensor.
  30.  

  1. Disconnect the sensor connector and measure at the harness side.
  2.  
  3. Turn the ignition switch to the "ON" position.
  4.  
  5. Measure the voltage between terminal No. 2 and ground. Voltage should be between 4.8 and 5.2 volts.
  6.  
  7. Turn the ignition switch to the "LOCK" (OFF) position.
  8.  
  9. If not within specifications, check connectors and wiring between the sensor and ECM/PCM. Repair/replace as necessary.
  10.  
  11. If within specifications, disconnect the sensor connector and measure at the harness side.
  12.  
  13. Turn the ignition switch to the "ON" position.
  14.  
  15. Measure the voltage between terminal No. 3 and ground. Voltage should be battery positive voltage.
  16.  
  17. Turn the ignition switch to the "LOCK" (OFF) position.
  18.  
  19. If not within specifications, check connectors and wiring between the sensor and MFI relay. Repair/replace as necessary.
  20.  
  21. If within specifications, disconnect the sensor connector and measure at the harness side.
  22.  
  23. Check for the resistance between terminal No. 1 and ground. Resistance should be less than 2 ohms.
  24.  
  25. If not within specifications, check connectors and wiring between the sensor and ECM/PCM. If connectors and wiring between sensor and ECM/PCM are good, replace the ECM/PCM.
  26.  
  27. If within specifications, check the camshaft position sensing cylinder. Repair if necessary.
  28.  
  29. If the camshaft position sensing cylinder in good, replace the CMP sensor.
  30.  

 
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