Aura, Outlook 2007

Manifold Absolute Pressure Sensor

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Removal & Installation



2.4L Engine
  1. Remove the air cleaner outlet duct.
  2.  
  3. Disconnect the Evaporative Emission (EVAP) canister purge tube from the intake manifold.
  4.  
  5. Reposition the EVAP canister purge tube out of the way.
  6.  
  7. Disconnect the fuel injector wiring harness electrical connector from the Manifold Absolute Pressure (MAP) sensor.
  8.  
  9. Remove the fuel injector wiring harness clips from the fuel rail tabs.
  10.  
  11. Disconnect the fuel injector wiring harness electrical connector from the number 3 fuel injector.
  12.  
  13. Squeeze tabs and slide the MAP sensor upward.
  14.  

To install:

  1. Installation is the reverse of removal, Lubricate a new sensor seal with clean engine oil prior to installation. Always replace the seal.
  2.  

3.5L Engine
  1. Remove the intake manifold cover.
  2.  
  3. Disconnect the engine wiring harness electrical connector from the Manifold Absolute Pressure (MAP) sensor.
  4.  
  5. Remove the spark plug wire clip from the MAP sensor bracket, if necessary.
  6.  
  7. Remove the upper intake manifold bolt.
  8.  
  9. Remove the MAP sensor bracket.
  10.  
  11. Remove the MAP sensor and seal from the upper intake manifold. Discard the seal.
  12.  

To install:

  1. Installation is the reverse of removal, Lubricate a new sensor seal with clean engine oil prior to installation. Always replace the seal.
  2.  
  3. Tighten the upper intake manifold bolt to 18 ft. lbs. (25 Nm).
  4.  

3.6L Engines
  1. Remove the fuel injector sight shield.
  2.  
  3. Disconnect the engine wiring harness electrical connector from the Manifold Absolute Pressure (MAP) sensor.
  4.  
  5. Remove the MAP sensor bolt and sensor.
  6.  
  7. Installation is the reverse of removal, Lubricate a new sensor seal with clean engine oil prior to installation. Always replace the seal.
  8.  

Testing



2.4L Engine


Click image to see an enlarged view

Fig. Manifold Absolute Pressure (MAP) sensor-2.4L engine terminals (1) 5-Volt Reference 1 (2) Low Reference (3) MAP Sensor Signal

  1. Verify the integrity of the entire air induction system by inspecting for:

    Any damaged components
     
    Loose or improper installation
     
    An air flow restriction
     
    Vacuum leaks
     
    Improperly routed vacuum hoses
     
    In cold climates, inspect for any snow or ice buildup
     

  2.  
  3. Verify that restrictions do not exist in the MAP sensor port or vacuum source.
  4.  
  5. Turn the ignition OFF, disconnect the MAP harness connector at the MAP sensor.
  6.  
  7. Turn the ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal A and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  8.  
  9. Turn the ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal C and ground. If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  10.  
  11. Verify the scan tool MAP Sensor parameter is less than 12 kPa. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  12.  
  13. Install a 3A fused jumper wire between the signal circuit and the 5-volt reference circuit terminal C.
  14.  
  15. Verify the scan tool MAP Sensor parameter is greater than 103 kPa. If less than the specified range, test the signal circuit terminal B for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  16.  
  17. If all circuits test normal, test or replace the MAP sensor.
  18.  
  19. Turn the ignition OFF, remove the vacuum source from the MAP sensor.
  20.  
  21. Turn the ignition ON, observe and recorded the scan tool MAP Sensor parameter. This is the first MAP sensor reading.
  22.  
  23. With a vacuum pump, apply 5 in Hg (17 kPa) of vacuum to the MAP sensor. Observe and record the scan tool MAP Sensor parameter. This is the second MAP sensor reading.
  24.  
  25. Subtract the second MAP sensor reading from the first MAP sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum. If the vacuum decrease is not within the specified range, replace the MAP sensor.
  26.  
  27. With a vacuum pump, apply 10 in Hg (34 kPa) of vacuum to the MAP sensor. Observe and record the scan tool MAP Sensor parameter. This is the third MAP sensor reading.
  28.  
  29. Subtract the third MAP sensor reading from the first MAP sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum. If the vacuum is not within the specified range, replace the MAP sensor.
  30.  
  31. Turn the ignition OFF, remove the MAP sensor.
  32.  
  33. Install a 3A fused jumper wire between the 5-volt reference circuit terminal C and the corresponding terminal of the MAP sensor.
  34.  
  35. Install a jumper wire between the low reference circuit terminal A of the MAP sensor and ground. Install a jumper wire at terminal B of the MAP sensor.
  36.  
  37. Connect a DMM between the jumper wire from terminal B of the MAP sensor and ground.
  38.  
  39. Turn the ignition ON, install a vacuum pump to the MAP sensor vacuum port. Slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5.2 volts without any spikes or dropouts. If the voltage reading is erratic, replace the MAP sensor.
  40.  

3.5L And 3.6L Engines
  1. Verify the integrity of the entire air induction system by inspecting for the following:

    Any damaged components
     
    Loose or improper installation
     
    An air flow restriction
     
    Vacuum leaks
     
    Improperly routed vacuum hoses
     
    In cold climates, inspect for any snow or ice buildup
     

  2.  
  3. Verify that restrictions do not exist in the MAP sensor port or vacuum source.
  4.  
  5. Turn the ignition OFF, disconnect the harness connector at the MAP sensor.
  6.  
  7. Turn the ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal 2 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  8.  
  9. Turn the ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground. If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  10.  
  11. Verify the scan tool MAP parameter is less than 1 kPa. If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the ECM.
  12.  
  13. Install a 3A fused jumper wire between the signal circuit terminal 3 and the 5-volt reference circuit terminal 1. Verify the scan tool MAP parameter is greater than 126 kPa. If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  14.  
  15. If all circuits test normal, test or replace the MAP sensor.
  16.  
  17. Turn the ignition OFF, remove the vacuum source from the MAP sensor.
  18.  
  19. Turn the ignition ON, observe and record the scan tool MAP sensor pressure parameter. This is the first MAP sensor reading.
  20.  
  21. With a vacuum pump apply 5 in Hg (17 kPa) of vacuum to the MAP sensor. Observe and record the scan tool MAP sensor pressure parameter. This is the second MAP sensor reading.
  22.  
  23. Subtract the second MAP sensor reading from the first MAP sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum. If the vacuum decrease is not within the specified range, replace the MAP sensor.
  24.  
  25. With a vacuum pump, apply 10 in Hg (34 kPa) of vacuum to the MAP sensor. Observe and record the scan tool MAP sensor pressure parameter. This is the third MAP sensor reading.
  26.  
  27. Subtract the third MAP sensor reading from the first MAP sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum. If the vacuum decrease is not within the specified range, replace the MAP sensor.
  28.  
  29. Turn the ignition OFF, remove the MAP sensor.
  30.  
  31. Install a 3A fused jumper wire between the 5-volt reference circuit terminal 1 and the corresponding terminal of the MAP sensor.
  32.  
  33. Install a jumper wire between the low reference circuit terminal 2 of the MAP sensor and ground.
  34.  
  35. Install a jumper wire at terminal 3 of the MAP sensor.
  36.  
  37. Connect a DMM between the jumper wire from terminal 3 of the MAP sensor and ground.
  38.  
  39. Turn the ignition ON, with a vacuum pump, slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5.2 volts, without any spikes or dropouts. If the voltage reading is erratic, replace the MAP sensor.

    Click image to see an enlarged view

    Fig. Manifold Absolute Pressure (MAP) sensor terminals-3.5L and 3.6L engines (A) Low Reference (B) MAP Sensor Signal (C) 5-Volt Reference

  40.  

 
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