Subaru Forester 1998-05

Manifold Absolute Pressure Sensor

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Operation



The sensor monitors and signals the ECM of changes in intake manifold pressure which result from engine load, speed and atmospheric pressure changes.

Removal & Installation



  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the connector from the sensor.
  4.  
  5. Remove the sensor from its mounting.
  6.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  
  3. Be sure to use new O-rings.
  4.  
  5. Torque the retaining screw to 1.2 ft. lbs.
  6.  

Testing



  1. Turn the ignition switch ON.
  2.  
  3. Using the Subaru scan tool, operate the LED operation mode.
  4.  
  5. If the idle switch signal comes on and there are no other displayed codes check the condition of the sensor.
  6.  
  7. If the sensor is securely in place on its mounting and the throttle body is secure on its mounting, replace the sensor.
  8.  

 
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