Aura, Outlook 2007

Crankshaft Position Sensor

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Operation



The Crankshaft Position (CKP) sensor senses the crank angle (piston position) of each cylinder and converts it into a pulse signal. The PCM receives this signal and then computes the engine speed and controls the fuel injector timing and ignition timing based on this input.

Removal & Installation



2.4L Engines
  1. Remove the starter.
  2.  
  3. Disconnect the engine wiring harness electrical connector from the Crankshaft Position (CKP) sensor.
  4.  
  5. Remove the CKP sensor bolt.
  6.  
  7. Remove the CKP sensor.
  8.  

To install:

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

3.5L Engine
  1. Raise and support the vehicle.
  2.  
  3. Disconnect the engine wiring harness electrical connector from the Crankshaft Position (CKP) sensor.
  4.  
  5. Remove the CKP sensor stud.
  6.  
  7. Remove the CKP sensor.
  8.  

To install:

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

3.6L Engine
  1. Remove the exhaust manifold lower heat shield.
  2.  
  3. Disconnect the engine wiring harness electrical connector from the Crankshaft Position (CKP) sensor.
  4.  
  5. Remove the crankshaft sensor bolt.
  6.  
  7. Remove the crankshaft sensor.
  8.  

To install:

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

Testing



2.4L Engine


Click image to see an enlarged view

Fig. Crankshaft Position (CKP) Sensor terminals-2.4L engine (1) 5-Volt Reference (2) Low reference (3) CKP Sensor 1 Signal

  1. Turn the ignition OFF, disconnect the harness connector at the CKP sensor.
  2.  
  3. Turn the ignition OFF, test for less than 1 ohm of resistance between the low reference circuit terminal 2 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
    NOTE
    5K ohms or greater in the 5-volt reference circuit will cause this DTC to set.

  4.  
  5. Turn the ignition ON, engine OFF, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground. If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. 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, engine OFF, test for 4.8-5.2 volts between the signal circuit terminal 3 and ground. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. If greater than the specified range, test the 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 signal circuit terminal 3.
  10.  
  11. Turn the ignition ON, momentarily touch the other end of the fused jumper wire to the battery negative post repeatedly. The CKP Active Counter should increment. If the CKP Active Counter increments, test or replace the CKP sensor. If the CKP Active Counter does not increment, replace the ECM.
  12.  
  13. Turn the ignition OFF, inspect the CKP sensor for correct installation. Remove the CKP sensor from the engine. Inspect the sensor and the O-ring for damage. If the sensor is loose, inspect the sensor and the O-ring for damage. Replace as necessary. Inspect the engine oil for debris, crankshaft reluctor wheel for damage the timing chain, tensioner and sprockets for wear or damage and repair as needed.
  14.  
  15. If all circuits and components test normal, test or replace the CKP sensor.
  16.  
  17. Remove the CKP sensor and inspect the sensor and the O-ring for damage.
  18.  
  19. Connect the connector to the CKP sensor.
  20.  
  21. Turn the ignition ON, engine OFF, observe the CKP Active Counter while passing a steel object by the tip of the sensor repeatedly. The CKP Active Counter should increment. If the CKP Active Counter does not increment, replace the CKP sensor.
  22.  

3.5L And 3.6L Engines
  1. Disconnect the CKP sensor connector.
  2.  
  3. Test for less than 1 ohm of resistance between 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 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 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 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 CKP sensor signal circuit repeatedly. The CKP Active Counter parameter should increment. If the CKP Active Counter parameter does not increment, replace the ECM.
  10.  
  11. Turn the ignition OFF, inspect the CKP sensor for looseness and correct installation. If the sensor is loose, inspect the sensor and the O-ring for damage. Replace as necessary.
  12.  
  13. Inspect the engine for the following:

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

  14.  
  15. 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.
  16.  
  17. Inspect the CKP sensor for looseness and correct installation. Remove the CKP 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 CKP sensor.
  18.  
  19. Connect the CKP sensor connector to the CKP sensor. Turn ON the ignition, with the engine OFF.
  20.  
  21. Observe the CKP Active Counter parameter on the scan tool. Pass a steel object by the tip of the sensor repeatedly. The CKP Active Counter parameter should increment. If the parameter does not increment, replace the CKP sensor.

    Click image to see an enlarged view

    Fig. Crankshaft Position (CMP) sensor terminals-3.5L and 3.6L engines (A) 5-Volt Reference 2 (B) Low Reference (C) Medium Resolution Engine Speed Signal

  22.  

 
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