Lexus Car ES, IS, LS 1998-06

Crankshaft Position Sensor

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Operation



4.0L

The Crankshaft Position Sensor (CKP) is mounted to the transmission bellhousing at the left/rear side of the engine block. Engine speed and crankshaft position are provided through the crankshaft position sensor. The sensor generates pulses that are the input sent to the powertrain control module (PCM). The PCM interprets the sensor input to determine the crankshaft position. The PCM then uses this position, along with other inputs, to determine injector sequence and ignition timing. The sensor is a Hall effect device combined with an internal magnet. It is also sensitive to steel within a certain distance from it.

On 4.0L 6-cylinder engines, the flywheel/drive plate has 3 sets of four notches at its outer edge. The notches cause a pulse to be generated when they pass under the sensor. The pulses are the input to the PCM. For each engine revolution there are 3 sets of four pulses generated.

The trailing edge of the fourth notch, which causes the pulse, is four degrees before top dead center (TDC) of the corresponding piston. The engine will not operate if the PCM does not receive a crankshaft position sensor input.

Click image to see an enlarged view

Fig.



Click image to see an enlarged view

Fig.

4.7L

The Crankshaft Position Sensor (CKP) is mounted into the engine block above the starter motor. Engine speed and crankshaft position are provided through the crankshaft position sensor. The sensor generates pulses that are the input sent to the powertrain control module (PCM). The PCM interprets the sensor input to determine the crankshaft position. The PCM then uses this position, along with other inputs, to determine injector sequence and ignition timing. The sensor is a Hall effect device combined with an internal magnet. It is also sensitive to steel within a certain distance from it.

On the 4.7L V8 engine, a tone wheel is bolted to the engine crankshaft. This tone wheel has sets of notches at its outer edge. The notches cause a pulse to be generated when they pass under the sensor. The pulses are the input to the PCM.

Click image to see an enlarged view

Fig.



Click image to see an enlarged view

Fig.

Removal & Installation



4.0L Engine

New replacement sensors will be equipped with a paper spacer glued to bottom of sensor. If installing (returning) a used sensor to vehicle, a new paper spacer must be installed to bottom of sensor. This spacer will be ground off the first time engine is started. If spacer is not used, sensor will be broken the first time engine is started.

New Sensors: Be sure paper spacer is installed to bottom of sensor. If not, obtain spacer PN05252229.

Used Sensors: Clean bottom of sensor and install spacer PN05252229.

  1. Install sensor into transmission bellhousing hole.
  2.  
  3. Position sensor wire shield to sensor.
  4.  
  5. Push sensor against flywheel/drive plate. With sensor pushed against flywheel/drive plate, tighten mounting bolt to 7 Nm (60 inch lbs.) torque.
  6.  
  7. Route sensor wiring harness into wire shield.
  8.  
  9. Connect sensor pigtail harness electrical connector to main wiring harness.
  10.  

4.7L

The Crankshaft Position (CKP) sensor is bolted to the side of the engine cylinder block above the starter motor. It is positioned into a machined hole at the side of the engine block.

  1. Remove starter motor.
  2.  
  3. Disconnect CKP electrical connector at sensor.
  4.  
  5. Remove CKP mounting bolt.
  6.  
  7. Carefully twist sensor from cylinder block.
  8.  
  9. Remove sensor from vehicle.
  10.  
  11. Check condition of sensor O-ring.

    Click image to see an enlarged view

    Fig.

  12.  

Testing



2GR-FSE VIN E
  1. Using an ohmmeter, measure the resistance between the terminals.
  2.  
  3. Resistance should be: 1,630-2,740 ohms cold and 2,065-3,225 ohms hot.
  4.  

4GR-FSE VIN K
  1. Using an ohmmeter, measure the resistance between the terminals.
  2.  
  3. Resistance should be : 1,630-2,740 ohms cold and 2,065-3,225 ohms hot.
  4.  

 
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