Mazda RX-8 2004-06

Throttle Position Sensor

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Operation



The TPS is a variable resistor. As the accelerator pedal is depressed and released, the resistance inside the sensor changes. The computer uses this reading to determine proper air/fuel mixture and ignition timing settings.

Removal & Installation



  1. Disconnect the negative battery cable.
  2.  
  3. Remove the necessary air intake components to access the TPS.
  4.  
  5. Detach the electrical wire harness plug from the sensor.
  6.  
  7. Paint an alignment mark on the sensor housing to the throttle body.
  8.  
  9. Remove the sensor attaching bolts.
  10.  
  11. Remove the sensor from the throttle body.
  12.  
  13. Installation is the reverse of the removal procedure.
  14.  

Testing



  1. Turn the ignition switch to ON position (Engine OFF).
  2.  
  3. Measure voltage between the PCM terminal 1J and ground Standard value:
    1. Closed throttle-0.40-0.80 volts.
    2.  
    3. Wide open throttle-3.815-4.095 volts.
    4.  

  4.  
  5. Measure voltage between the PCM terminal 1M and ground. Standard value:
    1. Closed throttle-1.18-1.78 volts
    2.  
    3. Wide open throttle-4.033-4.303 volts.
    4.  

  6.  
  7. If within specifications, check wiring and/or connectors and repair/replace as necessary.
  8.  
  9. If not within specifications, replace the throttle body.
  10.  

 
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