Ram Truck 1500, 2500 & 3500 (2006-2008)

Exhaust Backpressure Sensor

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Operation



6.7L Diesel Engine

The exhaust gas pressure sensor is used to measure exhaust gas pressure in the exhaust manifold. This information is used by the ECM to control emissions and EGR valve operation. The Electronic Control Module (ECM) provides a 5-volt supply to the exhaust gas pressure sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The exhaust gas pressure sensor provides a signal to the ECM on the exhaust gas pressure sensor signal circuit. This sensor signal voltage changes based on the pressure in the exhaust manifold If this fault becomes active the ECM will light the MIL light immediately. During this time the ECM uses an estimated exhaust gas pressure. An engine power derate may be experienced. The ECM turns off the MIL when the diagnostic runs and passes in 4 consecutive drive cycles.

Removal & Installation



6.7L Diesel Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Raise and support vehicle.
  4.  
  5. Disconnect the electrical connector.
  6.  
  7. Disconnect hoses at the differential pressure sensor.
  8.  
  9. Remove the mounting bolt and differential pressure sensor.
  10.  
  11. Remove all mounting bolts.
  12.  

To install:

  1. Position the differential pressure sensor.
  2.  
  3. Install all mounting nuts and bolts. Tighten to 89 inch. lbs. (10 Nm).
  4.  
  5. Install the hoses to the differential pressure sensor.
  6.  
  7. Connect the electrical connector.
  8.  
  9. Lower the vehicle.
  10.  

Testing



6.7L Diesel Engine
  1. Turn the ignition off.
  2.  
  3. Disconnect the exhaust pressure sensor harness connector.
  4.  
  5. Check connectors, clean and repair as necessary.
  6.  
  7. Turn the ignition on.
  8.  
  9. Measure the voltage to the exhaust pressure sensor harness connector F855 (Pin 1) 5-volt supply.
  10.  
  11. If the voltage is not between 4.5-5.2 volts. Repair the open or short to the 5-volt Supply circuit.

    Click image to see an enlarged view

    Fig. Exhaust differential pressure sensor harness view

  12.  

 
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