Toyota Previa 1991-1997 Repair Information

Camshaft Position Sensor

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OPERATION



The Camshaft Position sensor (G signal) consists of a signal plate and pickup coil. The G signal plate has one tooth on its outer circumference and is built into the distributor. When the camshafts rotate, the protrusion on the signal plate and the air gap on the pickup coil change, causing fluctuations in the magnetic field and generating an electromotive force in the pickup coil. The NE signal plate has 34 teeth and is mounted on the crankshaft. The NE signal sensor generates 34 signals every engine revolution. The ECM detects the standard crankshaft angle based on the G signals and the actual crankshaft angle and the engine speed by the NE signals.

TESTING



1991 Models

See Figure 1

  1. Using a suitable ohmmeter, check the resistance cold between the terminals of the signal generator.
  2.  
  3. The signal generator (pick-up coil) resistance cold should be as follows:

    NE-G- -180-220 ohms
     
    G1-G- -140-180 ohms
     
    G2-G- -140-180 ohms
     

  4.  
  5. If the resistance is not correct, replace the distributor housing assembly.
  6.  



Click image to see an enlarged view

Fig. Fig. 1: Terminal identification of the pick-up coil-2TZ-FE engine

1992 Models
  1. Using a suitable ohmmeter, check the resistance cold between the terminals of the signal generator.
  2.  
  3. The signal generator (pick-up coil) resistance cold should be as follows:

    NE-G- -155-240 ohms
     
    G1-G- -125-190 ohms
     
    G2-G- -125-190 ohms
     

  4.  
  5. If the resistance is not correct, replace the distributor housing assembly.
  6.  

1993-95 2TZ-FE Engines
  1. Using a suitable ohmmeter, check the resistance cold between the terminals of the signal generator.
  2.  
  3. The signal generator (pick-up coil) resistance cold should be as follows:

    NE-G- -155-250 ohms
     
    G1-G- -125-200 ohms
     
    G2-G- -125-200 ohms
     

  4.  
  5. If the resistance is not correct, replace the distributor housing assembly.
  6.  

1995-97 2TZ-FZE Engines

See Figure 2

  1. Using a suitable ohmmeter, check the resistance of the signal generator.
  2.  
  3. Pick up coil resistance should be as follows:

    1995 Cold-125-200 ohms
     
    1995 Hot-160-235 ohms
     
    1996 Cold-135-220 ohms
     
    1996 Hot-175-255 ohms
     
    1997 Cold-125-200 ohms
     
    1997 Hot-160-235 ohms
     

  4.  
  5. If the resistance is not correct, replace the distributor housing assembly.
  6.  



Click image to see an enlarged view

Fig. Fig. 2: Testing the terminals of the pick-up coil-2TZ-FZE engine

REMOVAL & INSTALLATION



The camshaft position sensor is integrated with the distributor assembly. If the camshaft position sensor is found to be faulty, the distributor assembly must be replaced.

 
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