Honda - Accord Prelude 1996 2000

Crankshaft Position Sensor

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OPERATION





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Fig. View of a Crankshaft Position Sensor (CKP)



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Fig. On some models, the CKP sensor is integral with the TDC sensor as a single assembly

The Crankshaft Position (CKP) sensor is used to monitor engine speed and determines the timing for the for the fuel injectors for each cylinder.

On some vehicles, the CKP sensor is integral with a Top Dead Center (TDC) sensor. The TDC sensor determines ignition timing at startup and also detects when crank angle is abnormal.

The CKP sensor is located behind the crankshaft pulley.

TESTING



4-Cylinder Engines

If the Diagnostic Trouble Code (DTC) PO335 and or PO336 is thrown, perform the following test.

  1. Reset the Electronic Control Module (ECM).
  2.  
  3. Start the engine. Does the code reoccur- If so proceed on to the next step. If not, the problem is intermittent and you should check for loose connections and poor grounds.
  4.  
  5. Position the ignition switch in the OFF position.
  6.  
  7. Detach the Crankshaft Position (CKP)/Top Dead Center (TDC) sensor electrical connector.
  8.  
  9. Measure the resistance between the terminals.
  10.  
  11. The resistance should measure, as follows:
    1. 1996 Accord: 0.5-1.0 kohms.
    2.  
    3. 1979-00 Accord: 1,850-2,450 ohms.
    4.  
    5. Prelude: 1.2-3.2 kohms
    6.  

  12.  
  13. If the resistance is not in the above specified range, replace the sensor.
  14.  

V6 Engines
2.7L ENGINE

If the Diagnostic Trouble Code (DTC) PO335 and or PO336 is thrown, perform the following test.

  1. Reset the Electronic Control Module (ECM), as outlined under clearing codes later in this section.
  2.  
  3. Start the engine. Does the code reoccur- If so proceed on to the next step. If not, the problem is intermittent and you should check for loose connections and poor grounds.
  4.  
  5. Turn the ignition switch OFF .
  6.  
  7. Detach the Crankshaft Position Sensor (CKP) 2-prong connector.
  8.  
  9. Check the resistance between terminals No. 1 and No. 2. Is there 1850-2450 ohms- If not, replace the sensor. If so, go on to the next step.
  10.  
  11. Check for ground between both terminals and the body of the vehicle.
  12.  
  13. Is there continuity- If so, replace the CKP sensor. If not, move on to the next step.
  14.  
  15. Attach the CKP sensor connector.
  16.  
  17. Detach the ECM connector "C".
  18.  
  19. Measure the resistance between B8 and B16. Is there 1850-2450 ohms- If so, move on to the next step. If not, repair the open in the wire between the ECM and the CKP sensor.
  20.  
  21. Check the continuity between the body ground and the ECM connector terminal B8. Is there continuity- If your answer is YES, repair the short in the wire between the ECM and the CKP sensor. If not, Honda recommends substituting a known good ECM. If the vehicle stops throwing the above code(s), replace the ECM with a new unit.
  22.  

3.0L ENGINE

If the Diagnostic Trouble Code (DTC) PO335 and or PO336 is thrown, perform the following test.

  1. Reset the Electronic Control Module (ECM), as outlined under clearing codes later in this section.
  2.  
  3. Start the engine. Does the code reoccur- If so proceed on to the next step. If not, the problem is intermittent and you should check for loose connections and poor grounds.
  4.  
  5. Turn the ignition switch OFF .
  6.  
  7. Detach the Crankshaft Position (CKP) sensor 2-prong connector.
  8.  
  9. Check the resistance between terminals No. 1 and No. 2. Is there 1850-2450 ohms- If not, replace the sensor. If so, go on to the next step.
  10.  
  11. Check for ground between both terminals and the body of the vehicle.
  12.  
  13. Is there continuity- If so, replace the CKP sensor. If not, move on to the next step.
  14.  
  15. Attach the CKP sensor connector.
  16.  
  17. Detach the ECM connector "C".
  18.  
  19. Measure the resistance between C8 and C9. Is there 1850-2450 ohms- If so, move on to the next step. If not, repair the open in the wire between the ECM and the CKP sensor.
  20.  
  21. Check the continuity between the body ground and the ECM connector terminal C8. Is there continuity- If your answer is YES, repair the short in the wire between the ECM and the CKP sensor. If not, Honda recommends substituting a known good ECM. If the vehicle stops throwing the above code(s), replace the ECM with a new unit.
  22.  

REMOVAL & INSTALLATION



  1. Remove the negative battery cable.
  2.  
  3. Detach the CKP sensor electrical connector at the front of the lower timing belt cover.
  4.  
  5. Remove the accessory drive belts. Refer to Section 1 for specific details on belt removal.
  6.  
  7. Remove the crankshaft pulley. Refer to Section 3 for specific details.
  8.  
  9. Remove the lower timing belt cover.
  10.  
  11. Remove the CKP sensor.
  12.  

The CKP sensor is part of the Top Dead Center (TDC) Sensor on some models and must be replaced as an unit.

  1. Install the CKP sensor in the reverse order of removal.
  2.  

 
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