Mazda Car 2002-04

Accelerator Pedal Position Sensor

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Description & Operation



A power supply is applied on the Accelerator Pedal Position (APP) Sensor (main) power terminal from the PCM. The ground terminal is grounded with PCM. When the accelerator pedal is moved from the idle position to the fully opened position, the resistance between the accelerator pedal position sensor (main) output terminal and ground terminal will increase according to the depression.

A power supply is applied on the Accelerator Pedal Position (APP) Sensor (main) power terminal from the PCM. The ground terminal is grounded with PCM. When the accelerator pedal is moved from the idle position to the fully opened position, the resistance between the accelerator pedal position sensor (main) output terminal and ground terminal will increase according to the depression.

A power supply is applied on the Accelerator Pedal Position (APP) Sensor (main) power terminal from the PCM. The ground terminal is grounded with PCM. When the accelerator pedal is moved from the idle position to the fully opened position, the resistance between the accelerator pedal position sensor (main) output terminal and ground terminal will increase according to the depression.

Removal & Installation





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Fig. Removing the APP sensor



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Fig. Accelerator pedal position sensor removal and installation



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Fig. Accelerator pedal position sensor removal and installation

Testing



  1. Connect a suitable scan tool to the diagnostic connector. Select APP1 or APP2 percentage.
  2.  
  3. Turn the ignition switch to the ON position.
  4.  
  5. Measure the voltage at the PCM terminal and ground with connectors connected:

    APP1-8% load or 0.4 volts with the accelerator pedal released
     
    APP1-60% load or 3.0 volts with the accelerator pedal depressed
     
    APP2 -8% load or 0.4 volts with the accelerator pedal released
     
    APP2 -60% load or 3.0 volts with the accelerator pedal depressed
     

  6.  
  7. If any check above does not meet the specifications, check connectors and wiring between the sensor and PCM. If ok, replace PCM.
  8.  
  9. If the measured values are outside the standard value range, or if the load % and/or voltage does not change smoothly, replace the sensor.
  10.  

  1. Connect a suitable scan tool to the diagnostic connector. Select APP1 or APP2 percentage.
  2.  
  3. Turn the ignition switch to the ON position.
  4.  
  5. Measure the voltage at the PCM terminal and ground with connectors connected:

    APP1 %-31.0-32.4% with the accelerator pedal released
     
    APP1 %-69.8-81.8% with the accelerator pedal depressed
     
    APP2 %-20.2-21.4% with the accelerator pedal released
     
    APP2 %-58.8-70.8% with the accelerator pedal depressed
     

  6.  
  7. If any check above does not meet the specifications, check connectors and wiring between the sensor and PCM. If ok, replace PCM.
  8.  
  9. If the measured values are outside the standard value range, or if the load % does not change smoothly, replace the sensor.
  10.  

 
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