Chrysler Cirrus/Stratus/Sebring/Avenger/Breeze 1995-1998

Manifold Absolute Pressure Sensor

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OPERATION



On 1996-98 vehicles equipped with the 2.0L SOHC engine, the IAT and Manifold Absolute Pressure (MAP) sensors are combined into a single sensor which is attached to the intake manifold. Refer to the IAT sensor information, located earlier in this section for operation.

The PCM supplies 5 volts of direct current to the Manifold Absolute Pressure (MAP) sensor. The MAP sensor then converts the intake manifold pressure into voltage. The PCM monitors the MAP sensor output voltage. As vacuum increases, the MAP sensor voltage decreases proportionately. Also, as vacuum decreases, the MAP sensor voltage increases proportionally.

With the ignition key ON , before the engine is started, the PCM determines atmospheric air pressure from the MAP sensor voltage. While the engine operates, the PCM figures out intake manifold pressure from the MAP sensor voltage. Based on the MAP sensor voltage and inputs from other sensors, the PCM adjusts spark advance and the air/fuel ratio. The MAP sensor is mounted to the intake manifold.

TESTING



See Figures 1, 2, 3 and 4

On 1996-98 vehicles equipped with the 2.0L SOHC engine, the IAT and Manifold Absolute Pressure (MAP) sensors are combined into a single sensor which is attached to the intake manifold. For those vehicles, refer to the IAT sensor information, located earlier in this section for testing.


WARNING
When testing the MAP sensor, make sure the harness wires do not become damaged by the test meter probes.

  1. Visually check the connector, making sure it is attached properly and that all of the terminals are straight, tight and free of corrosion.
  2.  
  3. Test the MAP sensor output voltage at the sensor connector between terminals 1 and 3, as illustrated.
  4.  



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Fig. Fig. 1: Manifold Absolute Pressure (MAP) sensor schematic

  1. With the ignition switch ON and the engine not running, the output voltage should be 4-5 volts. The voltage should fall to 1.5-2.1 volts with a hot, neutral idle speed condition. If OK, go to Step 4 or 5. If not OK, go to Step 6 or 7.
  2.  
  3. On all vehicles except 1995 Sebring coupe and Avenger models with 2.0L DOHC engines, test the PCM terminal 36 for the same voltage described in the previous step to make sure the wire harness is OK. Repair as necessary.
  4.  
  5. On 1995 Sebring coupe and Avenger models with the 2.0L DOHC engines, test the PCM terminal 29 for the same voltage described in Step 3 to make sure the wire harness is OK. Repair as necessary.
  6.  
  7. On all vehicles except 1995 Sebring coupe and Avenger models, test the MAP sensor ground circuit at the sensor connector terminal 1 and PCM terminal 43. If OK, go to Step 8. If not OK, repair as necessary.
  8.  
  9. On 1995 Sebring coupe and Avenger models, test the MAP sensor ground circuit at the sensor connector terminal 1 and PCM terminal 11. If OK, go to the next step. If not OK, repair as necessary.
  10.  
  11. Test the MAP sensor supply voltage between the sensor connector terminals 2 and 1 with the ignition key in the ON position. The voltage should be about 4.5-5.5 volts.
  12.  



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Fig. Fig. 2: Disconnecting the MAP sensor's electrical lead



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Fig. Fig. 3: Testing for reference voltage to the MAP sensor



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Fig. Fig. 4: MAP sensor and PCM terminal identifications

  1. On all vehicles except 1995 Sebring coupe and Avenger models with 2.0L DOHC engines, there should also be 4.5-5.5 volts at terminal 61 of the PCM.
  2.  
  3. On 1995 Sebring coupe and Avenger models with 2.0L DOHC engines, there should also be 4.5-5.5 volts at terminal 3 of the PCM. If OK, replace the MAP sensor.
  4.  
  5. If not, repair or replace the wire harness as required.
  6.  

REMOVAL & INSTALLATION



See Figure 5

On 1996-98 vehicles equipped with the 2.0L SOHC engine, the IAT and Manifold Absolute Pressure (MAP) sensors are combined into a single sensor which is attached to the intake manifold. For these vehicles, refer to the IAT sensor information, located earlier in this section, for removal and installation.



Click image to see an enlarged view

Fig. Fig. 5: MAP sensor location on a 2.0L DOHC engine

  1. Disconnect the negative battery cable.
  2.  
  3. Detach the electrical connector from the MAP sensor.
  4.  
  5. Unfasten the mounting screws, then remove the MAP sensor from the vehicle.
  6.  

To install:
  1. Insert the sensor into the intake manifold, but be careful not to damage the sensor's O-ring seal.
  2.  
  3. For 2.0L DOHC and 2.4L engines, tighten the sensor mounting screws to 20 inch lbs. (2 Nm). For 2.5L engines, tighten the sensor mounting screws to 30 inch lbs. (3.4 Nm).
  4.  
  5. Attach the sensor electrical connector.
  6.  
  7. Connect the negative battery cable.
  8.  

 
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