Acura Coupes and Sedans 1994-2000 Repair Information

Manifold Absolute Pressure Sensor

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OPERATION



See Figure 1

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Fig. Fig. 1: Typical Manifold Absolute Pressure (MAP) sensor and voltage reading specifications

The Manifold Absolute Pressure (MAP) sensor measures manifold vacuum using a frequency. This gives the ECU information on engine load. It is used as a barometric sensor for altitude adjustment of the air/fuel ratio.

TESTING



See Figure 1

  1. Check the MAP sensor connection.
  2.  
  3. Inspect the terminals within the connector for corrosion or points of high resistance.
  4.  
  5. Repair or replace as necessary.
  6.  
  7. If code three is detected, an electrical problem in the system may be present.
  8.  
  9. Remove the electrical connector from the map sensor.
  10.  
  11. Turn the ignition key to the ON position.
  12.  
  13. On the Integra, connect the positive lead of a voltmeter to the yellow/red wire
  14.  
  15. On the Legend, connect the positive lead of the voltmeter to the yellow/white wire.
  16.  
  17. Connect the negative probe to the green/white wire in the harness. Do not probe the MAP sensor side.
  18.  
  19. With the voltmeter connected properly, you should see a voltage of five volts.
  20.  
  21. On the Integra, probe the white wire; a five volt signal should be seen.
  22.  
  23. On the Legend, probe the red wire for a five volt reference signal.
  24.  
  25. If no voltage is detected, and all of the wiring is also OK, the Powertrain Control Module (PCM) may be faulty.
  26.  
  27. If the connector does have five volts going to it, reconnect it to the MAP sensor.
  28.  
  29. Backprobe the weather pack connector. There should be about three volts to the sensor.
  30.  
  31. If there are three volts, the PCM may be at fault.
  32.  
  33. If the sensor voltage is high or low, the sensor is the cause.
  34.  
  35. Turn the ignition to the OFF position and perform the repair.
  36.  

REMOVAL & INSTALLATION



  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the MAP sensor vacuum lines.
  4.  
  5. Remove the mounting screws from the MAP sensor.
  6.  
  7. Remove the MAP sensor.
  8.  
  9. Installation is the reverse of the removal procedure.
  10.  

 
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