Mitsubishi Car 1999-05

Throttle Position Sensor

Print

Operation



The Throttle Position (TP) sensor is a potentiometer that provides a signal to the PCM that is directly proportional to the throttle plate position. The TP sensor is mounted on the side of the throttle body and is connected to the throttle plate shaft. The TP sensor monitors throttle plate movement and position, and transmits an appropriate electrical signal to the PCM. These signals are used by the PCM to adjust the air/fuel mixture, spark timing and EGR operation according to engine load at idle, part throttle, or full throttle. The TP sensor is not adjustable.

The TP sensor receives a 5 volt reference signal and a ground circuit from the PCM. A return signal circuit is connected to a wiper that runs on a resistor internally on the sensor. The further the throttle is opened, the wiper moves along the resistor, at wide open throttle, the wiper essentially creates a loop between the reference signal and the signal return returning the full or nearly full 5 volt signal back to the PCM. At idle, the signal return should be approximately 0.9 volts.

A 5 volt power supply is applied to the Throttle Position Sensor (TPS) power terminal from the ECM/PCM. The ground terminal is grounded with ECM/PCM. When the throttle valve shaft is turned from the idle position to the fully opened position, the resistance between the TPS output terminal and the ground terminal would increase according to the rotation.

A 5 volt power supply is applied to the Throttle Position Sensor (TPS) power terminal from the ECM/PCM. The ground terminal is grounded with ECM/PCM. When the throttle valve shaft is turned from the idle position to the fully opened position, the resistance between the TPS output terminal and the ground terminal would increase according to the rotation.

A 5 volt power supply is applied to the Throttle Position Sensor (TPS) power terminal from the ECM/PCM. The ground terminal is grounded with ECM/PCM. When the throttle valve shaft is turned from the idle position to the fully opened position, the resistance between the TPS output terminal and the ground terminal would increase according to the rotation.

A 5 volt power supply is applied to the Throttle Position Sensor (TPS) power terminal from the ECM/PCM. The ground terminal is grounded with ECM/PCM. When the throttle valve shaft is turned from the idle position to the fully opened position, the resistance between the TPS output terminal and the ground terminal would increase according to the rotation.

A 5 volt power supply is applied to the Throttle Position Sensor (TPS) power terminal from the ECM/PCM. The ground terminal is grounded with ECM/PCM. When the throttle valve shaft is turned from the idle position to the fully opened position, the resistance between the TPS output terminal and the ground terminal would increase according to the rotation.

A 5 volt power supply is applied to the Throttle Position Sensor (TPS) power terminal from the ECM/PCM. The ground terminal is grounded with ECM/PCM. When the throttle valve shaft is turned from the idle position to the fully opened position, the resistance between the TPS output terminal and the ground terminal would increase according to the rotation.

Removal & Installation





Click image to see an enlarged view

Fig. Unplug the TP sensor connector



Click image to see an enlarged view

Fig. The TP sensor is secured with two retaining bolts

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the wiring harness from the TP sensor.
  4.  
  5. Remove the two sensor mounting screws, then pull the TP sensor off of the throttle shaft.
  6.  

To install:

  1. Carefully slide the rotary tangs on the sensor into position over the throttle shaft, then rotate the sensor clockwise to the installed position.
  2.  


CAUTION
Failure to install the TP sensor in this manner may result in sensor damage or high idle speeds.


NOTE
The TP sensor is not adjustable.

  1. Install and tighten the sensor mounting screws.
  2.  
  3. Connect the wiring harness to the sensor.
  4.  
  5. Connect the negative battery cable.
  6.  

  1. Disconnect negative battery cable.
  2.  
  3. Detach the electrical connector from the throttle position sensor.
  4.  
  5. Remove the mounting screws from the sensor, being careful not to round the Phillips screw head.
  6.  
  7. Remove the sensor from the throttle body.
  8.  

To install:

  1. Install the throttle position sensor onto the throttle body and rotate the sensor counterclockwise on the throttle shaft and temporarily tighten the screws.
  2.  
  3. Connect the electrical harness to the sensor.
  4.  
  5. Tighten the retainer screws to 1.8 ft. lbs. (2.5 Nm).
  6.  
  7. Connect the negative battery cable.
  8.  

  1. Disconnect negative battery cable.
  2.  
  3. Detach the electrical connector from the throttle position sensor.
  4.  
  5. Remove the mounting screws from the sensor, being careful not to round the Phillips screw head.
  6.  
  7. Remove the sensor from the throttle body.
  8.  

To install:

  1. Install the throttle position sensor onto the throttle body and rotate the sensor counterclockwise on the throttle shaft and temporarily tighten the screws.
  2.  
  3. Connect the electrical harness to the sensor.
  4.  
  5. Tighten the retainer screws to 1.8 ft. lbs. (2.5 Nm).
  6.  
  7. Connect the negative battery cable.
  8.  

  1. Disconnect negative battery cable.
  2.  
  3. Detach the electrical connector from the throttle position sensor.
  4.  
  5. Remove the mounting screws from the sensor, being careful not to round the Phillips screw head.
  6.  
  7. Remove the sensor from the throttle body.
  8.  

To install:

  1. Install the throttle position sensor onto the throttle body and rotate the sensor counterclockwise on the throttle shaft and temporarily tighten the screws.
  2.  
  3. Connect the electrical harness to the sensor.
  4.  
  5. Tighten the retainer screws to 1.8 ft. lbs. (2.5 Nm).
  6.  
  7. Connect the negative battery cable.
  8.  

  1. Disconnect negative battery cable.
  2.  
  3. Detach the electrical connector from the throttle position sensor.
  4.  
  5. Remove the mounting screws from the sensor, being careful not to round the Phillips screw head.
  6.  
  7. Remove the sensor from the throttle body.
  8.  

To install:

  1. Install the throttle position sensor onto the throttle body and rotate the sensor counterclockwise on the throttle shaft and temporarily tighten the screws.
  2.  
  3. Connect the electrical harness to the sensor.
  4.  
  5. Tighten the retainer screws to 1.8 ft. lbs. (2.5 Nm).
  6.  
  7. Connect the negative battery cable.
  8.  

  1. Disconnect negative battery cable.
  2.  
  3. Detach the electrical connector from the throttle position sensor.
  4.  
  5. Remove the mounting screws from the sensor, being careful not to round the Phillips screw head.
  6.  
  7. Remove the sensor from the throttle body.
  8.  

To install:

  1. Install the throttle position sensor onto the throttle body and rotate the sensor counterclockwise on the throttle shaft and temporarily tighten the screws.
  2.  
  3. Connect the electrical harness to the sensor.
  4.  
  5. Tighten the retainer screws to 1.8 ft. lbs. (2.5 Nm).
  6.  
  7. Connect the negative battery cable.
  8.  

  1. Disconnect negative battery cable.
  2.  
  3. Detach the electrical connector from the throttle position sensor.
  4.  
  5. Remove the mounting screws from the sensor, being careful not to round the Phillips screw head.
  6.  
  7. Remove the sensor from the throttle body.
  8.  

To install:

  1. Install the throttle position sensor onto the throttle body and rotate the sensor counterclockwise on the throttle shaft and temporarily tighten the screws.
  2.  
  3. Connect the electrical harness to the sensor.
  4.  
  5. Tighten the retainer screws to 1.8 ft. lbs. (2.5 Nm).
  6.  
  7. Connect the negative battery cable.
  8.  

Testing





Click image to see an enlarged view

Fig. Testing the SIG circuit to the TP sensor



Click image to see an enlarged view

Fig. Testing the SIG RTN circuit of the TP sensor



Click image to see an enlarged view

Fig. Testing the operation of the potentiometer inside the TP sensor while slowly opening the throttle



Click image to see an enlarged view

Fig. The TP sensor can be monitored with an appropriate and Data-stream capable scan tool

  1. With the engine OFF and the ignition ON , check the voltage at the signal return circuit of the TP sensor by carefully backprobing the connector using a DVOM.
  2.  
  3. Voltage should be between 0.2 and 1.4 volts at idle.
  4.  
  5. Slowly move the throttle pulley to the Wide Open Throttle (WOT) position and watch the voltage on the DVOM. The voltage should slowly rise to slightly less than 4.8 volts at WOT.
  6.  
  7. If no voltage is present, check the wiring harness for supply voltage (5.0 volts) and ground (0.3 volts or less), by referring to your corresponding wiring guide. If supply voltage and ground are present, but no output voltage from TP, replace the TP sensor. If supply voltage and ground do not meet specifications, make necessary repairs to the harness or PCM.
  8.  

  1. Disconnect the TPS connector.
  2.  
  3. Measure resistance between the TPS side connector terminals 1 and 4. Standard value: 3.5-6.5 kohms
  4.  
  5. Measure resistance between the TPS side connector terminals 1 and 3. With test probes in place, move the throttle valve from the idle position to the full-open position. Resistance should change smoothly in proportion to the opening angle of the throttle valve.
  6.  
  7. If any check above does not meet the specifications, replace the TPS.
  8.  
  9. If all checks above meet the specifications, disconnect the sensor connector and measure at the harness side.
  10.  
  11. Turn the ignition switch to "ON" position and measure the voltage between terminal 4 and ground. Voltage should be between 4.8 and 5.2 volts.
  12.  
  13. Turn the ignition switch to "LOCK" (OFF) position and check for the resistance between terminal 1 and ground. Resistance should be less than 2 ohm.
  14.  
  15. If any check above does not meet the specifications, check connectors and wiring between the sensor and ECM/PCM. If ok, replace ECM/PCM.
  16.  

  1. Disconnect the TPS connector.
  2.  
  3. Measure resistance between the TPS side connector terminals 1 and 4. Standard value: 3.5-6.5 kohms
  4.  
  5. Measure resistance between the TPS side connector terminals 1 and 3. With test probes in place, move the throttle valve from the idle position to the full-open position. Resistance should change smoothly in proportion to the opening angle of the throttle valve.
  6.  
  7. If any check above does not meet the specifications, replace the TPS.
  8.  
  9. If all checks above meet the specifications, disconnect the sensor connector and measure at the harness side.
  10.  
  11. Turn the ignition switch to "ON" position and measure the voltage between terminal 4 and ground. Voltage should be between 4.8 and 5.2 volts.
  12.  
  13. Turn the ignition switch to "LOCK" (OFF) position and check for the resistance between terminal 1 and ground. Resistance should be less than 2 ohm.
  14.  
  15. If any check above does not meet the specifications, check connectors and wiring between the sensor and ECM/PCM. If ok, replace ECM/PCM.
  16.  

  1. Disconnect the TPS connector.
  2.  
  3. Measure resistance between the TPS side connector terminals 1 and 4. Standard value: 3.5-6.5 kohms
  4.  
  5. Measure resistance between the TPS side connector terminals 1 and 3. With test probes in place, move the throttle valve from the idle position to the full-open position. Resistance should change smoothly in proportion to the opening angle of the throttle valve.
  6.  
  7. If any check above does not meet the specifications, replace the TPS.
  8.  
  9. If all checks above meet the specifications, disconnect the sensor connector and measure at the harness side.
  10.  
  11. Turn the ignition switch to "ON" position and measure the voltage between terminal 4 and ground. Voltage should be between 4.8 and 5.2 volts.
  12.  
  13. Turn the ignition switch to "LOCK" (OFF) position and check for the resistance between terminal 1 and ground. Resistance should be less than 2 ohm.
  14.  
  15. If any check above does not meet the specifications, check connectors and wiring between the sensor and ECM/PCM. If ok, replace ECM/PCM.
  16.  

  1. Disconnect the TPS connector.
  2.  
  3. Measure resistance between the TPS side connector terminals 1 and 4. Standard value: 3.5-6.5 kohms
  4.  
  5. Measure resistance between the TPS side connector terminals 1 and 3. With test probes in place, move the throttle valve from the idle position to the full-open position. Resistance should change smoothly in proportion to the opening angle of the throttle valve.
  6.  
  7. If any check above does not meet the specifications, replace the TPS.
  8.  
  9. If all checks above meet the specifications, disconnect the sensor connector and measure at the harness side.
  10.  
  11. Turn the ignition switch to "ON" position and measure the voltage between terminal 4 and ground. Voltage should be between 4.8 and 5.2 volts.
  12.  
  13. Turn the ignition switch to "LOCK" (OFF) position and check for the resistance between terminal 1 and ground. Resistance should be less than 2 ohm.
  14.  
  15. If any check above does not meet the specifications, check connectors and wiring between the sensor and ECM/PCM. If ok, replace ECM/PCM.
  16.  

  1. Disconnect the TPS connector.
  2.  
  3. Measure resistance between the TPS side connector terminals 1 and 4. Standard value: 3.5-6.5 kohms
  4.  
  5. Measure resistance between the TPS side connector terminals 1 and 3. With test probes in place, move the throttle valve from the idle position to the full-open position. Resistance should change smoothly in proportion to the opening angle of the throttle valve.
  6.  
  7. If any check above does not meet the specifications, replace the TPS.
  8.  
  9. If all checks above meet the specifications, disconnect the sensor connector and measure at the harness side.
  10.  
  11. Turn the ignition switch to "ON" position and measure the voltage between terminal 4 and ground. Voltage should be between 4.8 and 5.2 volts.
  12.  
  13. Turn the ignition switch to "LOCK" (OFF) position and check for the resistance between terminal 1 and ground. Resistance should be less than 2 ohm.
  14.  
  15. If any check above does not meet the specifications, check connectors and wiring between the sensor and ECM/PCM. If ok, replace ECM/PCM.
  16.  

  1. Disconnect the TPS connector.
  2.  
  3. Measure resistance between the TPS side connector terminals 1 and 4. Standard value: 3.5-6.5 kohms
  4.  
  5. Measure resistance between the TPS side connector terminals 1 and 3. With test probes in place, move the throttle valve from the idle position to the full-open position. Resistance should change smoothly in proportion to the opening angle of the throttle valve.
  6.  
  7. If any check above does not meet the specifications, replace the TPS.
  8.  
  9. If all checks above meet the specifications, disconnect the sensor connector and measure at the harness side.
  10.  
  11. Turn the ignition switch to "ON" position and measure the voltage between terminal 4 and ground. Voltage should be between 4.8 and 5.2 volts.
  12.  
  13. Turn the ignition switch to "LOCK" (OFF) position and check for the resistance between terminal 1 and ground. Resistance should be less than 2 ohm.
  14.  
  15. If any check above does not meet the specifications, check connectors and wiring between the sensor and ECM/PCM. If ok, replace ECM/PCM.
  16.  

 
label.common.footer.alt.autozoneLogo