Mitsubishi Car 1999-05

Manifold Absolute Pressure Sensor

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Operation



The most important information for measuring engine fuel requirements comes from the Manifold Absolute Pressure (MAP) sensor. Using the pressure and temperature data, the PCM calculates the intake air mass. It is connected to the engine intake manifold and takes readings of the absolute pressure.

Atmospheric pressure is measured both when the engine is started and when driving fully loaded, then the pressure sensor information is adjusted accordingly.

A 5-volt voltage is supplied to the Manifold Absolute Pressure (MAP) Sensor power terminal from the PCM. The ground terminal is grounded through the PCM. A voltage that is proportional to the intake manifold pressure is sent to the PCM the sensor output terminal.

A 5-volt voltage is supplied to the Manifold Absolute Pressure (MAP) Sensor power terminal from the PCM. The ground terminal is grounded through the PCM. A voltage that is proportional to the intake manifold pressure is sent to the PCM the sensor output terminal.

A 5-volt voltage is supplied to the Manifold Absolute Pressure (MAP) Sensor power terminal from the PCM. The ground terminal is grounded through the PCM. A voltage that is proportional to the intake manifold pressure is sent to the PCM the sensor output terminal.

A 5-volt voltage is supplied to the Manifold Absolute Pressure (MAP) Sensor power terminal from the PCM. The ground terminal is grounded through the PCM. A voltage that is proportional to the intake manifold pressure is sent to the PCM the sensor output terminal.

A 5-volt voltage is supplied to the Manifold Absolute Pressure (MAP) Sensor power terminal from the PCM. The ground terminal is grounded through the PCM. A voltage that is proportional to the intake manifold pressure is sent to the PCM the sensor output terminal.

A 5-volt voltage is supplied to the Manifold Absolute Pressure (MAP) Sensor power terminal from the PCM. The ground terminal is grounded through the PCM. A voltage that is proportional to the intake manifold pressure is sent to the PCM the sensor output terminal.

Removal & Installation





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Fig. Detach the electrical connector from the MAP sensor



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Fig. Remove the two MAP sensor retaining bolts . . .



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Fig. . . . then remove the sensor from the intake manifold. Inspect the tip of the sensor and replace if damaged or plugged

  1. Disconnect the negative battery cable.
  2.  
  3. Detach the connector for the MAP sensor.
  4.  
  5. Remove the sensor mounting screws.
  6.  
  7. Lift the sensor up and remove it from the intake manifold.
  8.  
  9. The installation is the reverse of removal.
  10.  

  1. Disconnect the negative battery cable.
  2.  
  3. Detach the electrical connector at the sensor.
  4.  
  5. Remove the sensor.
  6.  
  7. Installation is the reverse of the removal procedure.
  8.  

  1. Disconnect the negative battery cable.
  2.  
  3. Detach the electrical connector at the sensor.
  4.  
  5. Remove the sensor.
  6.  
  7. Installation is the reverse of the removal procedure.
  8.  

  1. Disconnect the negative battery cable.
  2.  
  3. Detach the electrical connector at the sensor.
  4.  
  5. Remove the sensor.
  6.  
  7. Installation is the reverse of the removal procedure.
  8.  

  1. Disconnect the negative battery cable.
  2.  
  3. Detach the electrical connector at the sensor.
  4.  
  5. Remove the sensor.
  6.  
  7. Installation is the reverse of the removal procedure.
  8.  

  1. Disconnect the negative battery cable.
  2.  
  3. Detach the electrical connector at the sensor.
  4.  
  5. Remove the sensor.
  6.  
  7. Installation is the reverse of the removal procedure.
  8.  

  1. Disconnect the negative battery cable.
  2.  
  3. Detach the electrical connector at the sensor.
  4.  
  5. Remove the sensor.
  6.  
  7. Installation is the reverse of the removal procedure.
  8.  

Testing



  1. Using a multimeter, check for voltage by backprobing the MAP sensor connector.
  2.  
  3. With the key ON , and the engine OFF , verify that there is at least 4.8 volts between the SIG and GND terminals of the MAP sensor connector. If voltage is not within specification, check power and ground circuits and repair as necessary.
  4.  
  5. With the key ON , and the engine ON , check the voltage between GND and SIG RTN terminals. Voltage should be approximately between 0.8 and 2.4 volts. If voltage is not within specification, the sensor may be faulty.
  6.  
  7. If the voltage check in step 3 was OK , then check the voltage between GND and SIG RTN terminals and suddenly depress the accelerator, the voltage should rise and stay at 2.4 volts. If the voltage does not stay at 2.4 volts, replace the MAP sensor.
  8.  

  1. Disconnect the MAP sensor connector.
  2.  
  3. Turn the ignition switch to the "ON" position.
  4.  
  5. Measure the voltage between terminal No. 3 of the MAP sensor harness connector and ground. Voltage should be between 4.9 and 5.1 volts.
  6.  
  7. Measure the voltage between terminal No. 2 of the MAP sensor harness connector and ground. Voltage should be 0.5 volt or less.
  8.  
  9. Turn the ignition switch to the "LOCK" (OFF) position.
  10.  
  11. If any check above does not meet the specifications, check connectors and wiring between the sensor and ECM/PCM. Repair/replace as necessary. If ok, replace ECM/PCM.
  12.  
  13. If within specifications, reconnect the MAP sensor connector.
  14.  
  15. Turn the ignition switch to the "ON" position.
  16.  
  17. Measure the voltage between terminal No. 1 and ground by backprobing the MAP sensor connector. Voltage should measure 3.7 and 4.3 volts when altitude is 0 m (0 foot), 3.4 and 4.0 volts when altitude is 600 m (1,969 feet), 3.2 and 3.8 volts when altitude is 1,200 m (3,937 feet), 2.9 and 3.5 volts when altitude is 1,800 m (5,906 feet).
  18.  
  19. Turn the ignition switch to the "LOCK" (OFF) position.
  20.  
  21. If within specifications, check connectors and wiring between the MAP sensor and the ECM/PCM. If ok, replace the ECM/PCM.
  22.  
  23. If not within specifications, replace the MAP sensor.
  24.  

  1. Disconnect the MAP sensor connector.
  2.  
  3. Turn the ignition switch to the "ON" position.
  4.  
  5. Measure the voltage between terminal No. 3 of the MAP sensor harness connector and ground. Voltage should be between 4.9 and 5.1 volts.
  6.  
  7. Measure the voltage between terminal No. 2 of the MAP sensor harness connector and ground. Voltage should be 0.5 volt or less.
  8.  
  9. Turn the ignition switch to the "LOCK" (OFF) position.
  10.  
  11. If any check above does not meet the specifications, check connectors and wiring between the sensor and ECM/PCM. Repair/replace as necessary. If ok, replace ECM/PCM.
  12.  
  13. If within specifications, reconnect the MAP sensor connector.
  14.  
  15. Turn the ignition switch to the "ON" position.
  16.  
  17. Measure the voltage between terminal No. 1 and ground by backprobing the MAP sensor connector. Voltage should measure 3.7 and 4.3 volts when altitude is 0 m (0 foot), 3.4 and 4.0 volts when altitude is 600 m (1,969 feet), 3.2 and 3.8 volts when altitude is 1,200 m (3,937 feet), 2.9 and 3.5 volts when altitude is 1,800 m (5,906 feet).
  18.  
  19. Turn the ignition switch to the "LOCK" (OFF) position.
  20.  
  21. If within specifications, check connectors and wiring between the MAP sensor and the ECM/PCM. If ok, replace the ECM/PCM.
  22.  
  23. If not within specifications, replace the MAP sensor.
  24.  

  1. Disconnect the MAP sensor connector.
  2.  
  3. Turn the ignition switch to the "ON" position.
  4.  
  5. Measure the voltage between terminal No. 3 of the MAP sensor harness connector and ground. Voltage should be between 4.9 and 5.1 volts.
  6.  
  7. Measure the voltage between terminal No. 2 of the MAP sensor harness connector and ground. Voltage should be 0.5 volt or less.
  8.  
  9. Turn the ignition switch to the "LOCK" (OFF) position.
  10.  
  11. If any check above does not meet the specifications, check connectors and wiring between the sensor and ECM/PCM. Repair/replace as necessary. If ok, replace ECM/PCM.
  12.  
  13. If within specifications, reconnect the MAP sensor connector.
  14.  
  15. Turn the ignition switch to the "ON" position.
  16.  
  17. Measure the voltage between terminal No. 1 and ground by backprobing the MAP sensor connector. Voltage should measure 3.7 and 4.3 volts when altitude is 0 m (0 foot), 3.4 and 4.0 volts when altitude is 600 m (1,969 feet), 3.2 and 3.8 volts when altitude is 1,200 m (3,937 feet), 2.9 and 3.5 volts when altitude is 1,800 m (5,906 feet).
  18.  
  19. Turn the ignition switch to the "LOCK" (OFF) position.
  20.  
  21. If within specifications, check connectors and wiring between the MAP sensor and the ECM/PCM. If ok, replace the ECM/PCM.
  22.  
  23. If not within specifications, replace the MAP sensor.
  24.  

  1. Disconnect the MAP sensor connector.
  2.  
  3. Turn the ignition switch to the "ON" position.
  4.  
  5. Measure the voltage between terminal No. 3 of the MAP sensor harness connector and ground. Voltage should be between 4.9 and 5.1 volts.
  6.  
  7. Measure the voltage between terminal No. 2 of the MAP sensor harness connector and ground. Voltage should be 0.5 volt or less.
  8.  
  9. Turn the ignition switch to the "LOCK" (OFF) position.
  10.  
  11. If any check above does not meet the specifications, check connectors and wiring between the sensor and ECM/PCM. Repair/replace as necessary. If ok, replace ECM/PCM.
  12.  
  13. If within specifications, reconnect the MAP sensor connector.
  14.  
  15. Turn the ignition switch to the "ON" position.
  16.  
  17. Measure the voltage between terminal No. 1 and ground by backprobing the MAP sensor connector. Voltage should measure 3.7 and 4.3 volts when altitude is 0 m (0 foot), 3.4 and 4.0 volts when altitude is 600 m (1,969 feet), 3.2 and 3.8 volts when altitude is 1,200 m (3,937 feet), 2.9 and 3.5 volts when altitude is 1,800 m (5,906 feet).
  18.  
  19. Turn the ignition switch to the "LOCK" (OFF) position.
  20.  
  21. If within specifications, check connectors and wiring between the MAP sensor and the ECM/PCM. If ok, replace the ECM/PCM.
  22.  
  23. If not within specifications, replace the MAP sensor.
  24.  

  1. Disconnect the MAP sensor connector.
  2.  
  3. Turn the ignition switch to the "ON" position.
  4.  
  5. Measure the voltage between terminal No. 3 of the MAP sensor harness connector and ground. Voltage should be between 4.9 and 5.1 volts.
  6.  
  7. Measure the voltage between terminal No. 2 of the MAP sensor harness connector and ground. Voltage should be 0.5 volt or less.
  8.  
  9. Turn the ignition switch to the "LOCK" (OFF) position.
  10.  
  11. If any check above does not meet the specifications, check connectors and wiring between the sensor and ECM/PCM. Repair/replace as necessary. If ok, replace ECM/PCM.
  12.  
  13. If within specifications, reconnect the MAP sensor connector.
  14.  
  15. Turn the ignition switch to the "ON" position.
  16.  
  17. Measure the voltage between terminal No. 1 and ground by backprobing the MAP sensor connector. Voltage should measure 3.7 and 4.3 volts when altitude is 0 m (0 foot), 3.4 and 4.0 volts when altitude is 600 m (1,969 feet), 3.2 and 3.8 volts when altitude is 1,200 m (3,937 feet), 2.9 and 3.5 volts when altitude is 1,800 m (5,906 feet).
  18.  
  19. Turn the ignition switch to the "LOCK" (OFF) position.
  20.  
  21. If within specifications, check connectors and wiring between the MAP sensor and the ECM/PCM. If ok, replace the ECM/PCM.
  22.  
  23. If not within specifications, replace the MAP sensor.
  24.  

  1. Disconnect the MAP sensor connector.
  2.  
  3. Turn the ignition switch to the "ON" position.
  4.  
  5. Measure the voltage between terminal No. 3 of the MAP sensor harness connector and ground. Voltage should be between 4.9 and 5.1 volts.
  6.  
  7. Measure the voltage between terminal No. 2 of the MAP sensor harness connector and ground. Voltage should be 0.5 volt or less.
  8.  
  9. Turn the ignition switch to the "LOCK" (OFF) position.
  10.  
  11. If any check above does not meet the specifications, check connectors and wiring between the sensor and ECM/PCM. Repair/replace as necessary. If ok, replace ECM/PCM.
  12.  
  13. If within specifications, reconnect the MAP sensor connector.
  14.  
  15. Turn the ignition switch to the "ON" position.
  16.  
  17. Measure the voltage between terminal No. 1 and ground by backprobing the MAP sensor connector. Voltage should measure 3.7 and 4.3 volts when altitude is 0 m (0 foot), 3.4 and 4.0 volts when altitude is 600 m (1,969 feet), 3.2 and 3.8 volts when altitude is 1,200 m (3,937 feet), 2.9 and 3.5 volts when altitude is 1,800 m (5,906 feet).
  18.  
  19. Turn the ignition switch to the "LOCK" (OFF) position.
  20.  
  21. If within specifications, check connectors and wiring between the MAP sensor and the ECM/PCM. If ok, replace the ECM/PCM.
  22.  
  23. If not within specifications, replace the MAP sensor.
  24.  

 
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