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SERIES 50 MANIFOLD ABSOLUTE PRESSURE SENSOR

The Manifold Absolute Pressure Sensor (MAP) is threaded into the intake manifold. See Figure 27856 . The Series 50G natural gas engines use a wide range sensor that allows pressure measurement under conditions of either manifold vacuum or boost. ‪

1. Intake Manifold ‪

5. Bolt ‪

2. Intake Manifold Inlet ‪

6. Air Temperature Sensor ‪

3. Intake Manifold Gasket ‪

7. Bolt ‪

4. Cylinder Head ‪

8. Manifold Absolute Pressure Sensor ‪

Manifold Absolute Pressure Sensor Series 50G

This device is a pressure sensor that sends an electrical signal to the ECM. The ECM uses this information to compute the amount of air entering the engine. Fuel supply is regulated by the TBS information to control engine air fuel ratio. The MAP information is also used to control ignition timing. ‪

Repair or Replacement of Manifold Absolute Pressure Sensor

The MAP is non-serviceable and must be replaced as an assembly. No adjustment is required. ‪

Removal of Manifold Absolute Pressure Sensor

Remove the MAP as follows: ‪

  1. Disengage the locking tang on the MAP connector body. Grasp the terminal body and gently pull it from the sensor.
  2. Remove the MAP from the intake manifold.

Installation of Manifold Absolute Pressure Sensor

Install the MAP as follows: ‪

Note: The MAP is an electronic device. Use care during installation.

  1. Install the MAP to the intake manifold.
  2. Engage the locking tang on the MAP connector body. Grasp the terminal body and gently pull it towards the sensor
  3. Put petroleum jelly on O-ring to hold it in position.
  4. Turn the ignition to the "ON" position. Observe or read any diagnostic codes. If any codes other than 25 appears, refer to the DDEC II Troubleshooting Guide , 6SE489, or DDEC III/IV Single ECM Troubleshooting Guide, 6SE497.