Aura, Outlook 2007

Camshaft Position Sensor

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Description & Operation



The Camshaft Position (CMP) sensor circuits consist of an Engine Control Module (ECM) supplied 5-volt reference circuit, low reference circuit, and an output signal circuit. The CMP sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor detects magnetic flux changes of the teeth and slots of a 4-tooth reluctor wheel attached to the camshaft. As each reluctor wheel tooth rotates past the CMP sensor, the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The sensor returns a digital ON/OFF DC voltage pulse of varying frequency, with 4 varying width output pulses per camshaft revolution that represent an image of the camshaft reluctor wheel. The frequency of the CMP sensor output depends on the velocity of the camshaft. The ECM decodes the narrow and wide tooth pattern to identify camshaft position. This information is then used to determine the optimum ignition and injection points of the engine. The ECM also uses CMP sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and for limp-home operation.

Removal & Installation



2.4L Engines
Exhaust Sensor
  1. Disconnect the engine wiring harness electrical connector) from the exhaust Camshaft Position (CMP) sensor.
  2.  
  3. Remove the CMP sensor bolt.
  4.  
  5. Remove the CMP sensor.
  6.  

To install:

  1. Installation is the reverse of removal, tighten the bolt to 89 in. lbs. (10 Nm).
  2.  
  3. Lubricate the CMP sensor O-ring seal with clean engine oil prior to installation.
  4.  

Intake Sensor
  1. Remove the air cleaner outlet duct.
  2.  
  3. Disconnect the engine wiring harness electrical connector from the intake Camshaft Position (CMP) sensor.
  4.  
  5. Remove the CMP sensor bolt.
  6.  
  7. Remove the CMP sensor.
  8.  

To install:

  1. Installation is the reverse of removal, tighten the bolt to 89 in. lbs. (10 Nm).
  2.  

3.5L Engine
  1. Remove the intake manifold cover.
  2.  
  3. Remove the power steering pump, if required.
  4.  
  5. Disconnect the fuel injector wiring harness electrical connector from the Camshaft Position (CMP) sensor.
  6.  
  7. Remove the CMP sensor bolt. Remove the CMP sensor.
  8.  
  9. Inspect the sensor O-ring for wear, cracks, or leakage if the sensor is not being replaced.
  10.  

To install:

  1. Installation is the reverse of removal, tighten the bolt to 89 in. lbs. (10 Nm).
  2.  
  3. Lubricate the CMP sensor O-ring seal with clean engine oil prior to installation.
  4.  

3.6L Engine
Bank 1 (Right Side) Exhaust
  1. Remove the air cleaner assembly.
  2.  
  3. Disconnect the engine wiring harness electrical connector from the bank 1 exhaust Camshaft Position (CMP) sensor.
  4.  
  5. Remove the CMP sensor bolt.
  6.  
  7. Remove the CMP sensor.
  8.  

To install:

  1. Installation is the reverse of removal, tighten the bolt to 89 in. lbs. (10 Nm).
  2.  

Bank 1 (Right Side) Intake
  1. Remove the air cleaner assembly.
  2.  
  3. Disconnect the engine wiring harness electrical connector from the bank 1 intake Camshaft Position (CMP) sensor. Remove the CMP sensor bolt. Remove the CMP sensor.
  4.  

To install:

  1. Installation is the reverse of removal, tighten the bolt to 89 in. lbs. (10 Nm).
  2.  

Bank 2 (Left Side) Exhaust
  1. Remove the air cleaner assembly.
  2.  
  3. Disconnect the engine wiring harness electrical connector from the bank 2 exhaust Camshaft Position (CMP) sensor.
  4.  
  5. Remove the CMP sensor bolt.
  6.  
  7. Remove the CMP sensor.
  8.  

To install:

  1. Installation is the reverse of removal, tighten the bolt to 89 in. lbs. (10 Nm).
  2.  

Bank 2 (Left Side) Intake
  1. Remove the air cleaner assembly.
  2.  
  3. Disconnect the engine wiring harness electrical connector from the bank 2 intake Camshaft Position (CMP) sensor.
  4.  
  5. Remove the CMP sensor bolt.
  6.  
  7. Remove the CMP sensor.
  8.  

To install:

  1. Installation is the reverse of removal, tighten the bolt to 89 in. lbs. (10 Nm).
  2.  

Testing



2.4L Engine


Click image to see an enlarged view

Fig. Camshaft Position (CMP) Sensor terminals-2.4L engine intake (A) 5-Volt Reference (B) Low reference (C) CMP Sensor 1 Signal



Click image to see an enlarged view

Fig. Camshaft Position (CMP) Sensor terminals-2.4L engine exhaust (A) 5-Volt Reference (B) Low reference (C) CMP Sensor 1 Signal

  1. Turn the ignition OFF, disconnect the appropriate Camshaft Position (CMP) sensor wire harness connector.
  2.  
  3. Test for less than 1 ohm of resistance between the appropriate low reference circuit terminal B and ground. If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  4.  
  5. Turn the ignition ON, test for 4.8-5.2 volts between the appropriate 5-volt reference circuit terminal A and ground. If less than the specified range, test the 5-volt reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM. If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  6.  
  7. Turn the ignition ON, test for 4.8-5.2 volts between the appropriate signal circuit terminal C and ground. If less than the specified range, test the affected signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM. If greater than the specified range, test the affected signal circuit for a short to voltage. If the circuit tests normal, replace the ECM
  8.  
  9. Turn the ignition OFF, connect a fused jumper wire to the CMP signal circuit terminal C.
  10.  
  11. Turn the ignition ON, momentarily touch the other end of the fused jumper wire to the battery negative post. The CMP active counter parameter on the scan tool should increment. If the CMP active counter increments, replace the CMP sensor If the CMP active counter does not increment, replace the ECM.
  12.  
  13. Turn the ignition OFF, inspect the CMP sensor for correct installation. If the sensor is loose, inspect the sensor and the O-ring for damage, replace as necessary. Inspect the engine oil for debris, the camshaft reluctor wheel for damage and the timing chain, tensioner and sprockets for damage and repair as needed.
  14.  
  15. Inspect the CMP sensor for correct installation. Remove the CMP sensor from the engine and inspect the sensor and the O-ring for damage. If the sensor is loose, incorrectly installed, or damaged, repair or replace the CMP sensor.
  16.  
  17. Connect the CMP sensor connector to the CMP sensor. Turn ON the ignition, with the engine OFF.
  18.  
  19. Turn the ignition ON, and engine OFF. Observe the CMP Active Counter parameter on the scan tool.
  20.  
  21. Pass a steel object by the tip of the sensor repeatedly. The CMP Active Counter parameter should increment. If the parameter does not increment, replace the CMP sensor.
  22.  

3.5L & 3.6L Engines
  1. Turn the ignition OFF, disconnect the affected CMP sensor connector.
  2.  
  3. Test for less than 1 ohm of resistance between ECM side of the low reference circuit and ground. If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  4.  
  5. Turn the ignition ON, test for 4.8-5.2 volts between the ECM side of the 5-volt reference circuit and ground. If less than the specified range, test the 5-volt reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM. If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  6.  
  7. Turn the ignition ON, test for 4.8-5.2 volts between the signal circuit and ground. If less than the specified range, test the affected signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM. If greater than the specified range, test the affected signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  8.  
  9. Turn the ignition ON, using a jumper wire connected to ground, momentarily touch the CMP sensor signal circuit repeatedly. The applicable CMP active counter parameter should increment.
  10.  
  11. If the CMP active counter does not increment, replace the ECM
  12.  
  13. If the circuits test normal, replace the CMP sensor.
  14.  
  15. Turn the ignition OFF, inspect the CMP sensor for looseness and correct installation. If the sensor is loose, inspect the sensor and the O-ring for damage. Replace as necessary.
  16.  
  17. Inspect the engine for the following conditions:

    Engine oil for debris
     
    Camshaft reluctor wheel for damage
     
    The timing chain, tensioner, and sprockets for wear or damage
     

  18.  
  19. If debris is found in the engine oil, inspect the internal engine components to determine the cause. Repair or replace any worn or damaged components
  20.  
  21. Inspect the CMP sensor for looseness and correct installation. Remove the CMP sensor from the engine and inspect the sensor and the O-ring for damage. If the sensor is loose, incorrectly installed, or damaged, repair or replace the CMP sensor.
  22.  
  23. Connect the CMP sensor connector to the CMP sensor. Turn ON the ignition, with the engine OFF.
  24.  
  25. Turn the ignition ON and engine OFF. Observe the applicable CMP Active Counter parameter on the scan tool. Pass a steel object by the tip of the sensor repeatedly. The CMP Active Counter parameter should increment. If the parameter does not increment, replace the CMP sensor.

    Click image to see an enlarged view

    Fig. Camshaft Position (CMP) sensor terminals-3.5L and 3.6L engines (A) 12-Volt Reference (B) Low Reference (C) CMP Sensor Signal

  26.  

 
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