For a complete wiring diagram Refer to Section 8W

Theory of Operation

The Diesel particulate filter is an inline canister filter located in the exhaust system between the engine and the muffler. This filter captures and stores ash particles created by the diesel combustion process. This filter is monitored by the ECM with a Differential Pressure Sensor. This sensor measures the difference in exhaust system pressure before and after the particulate filter through tube connections directly to the exhaust pipe. As ash and soot accumulate in the filter, the exhaust pressure at the inlet side of the filter increases as compared to the pressure at the outlet side of the filter.

• When Monitored:

  With the ignition on.

• Set Condition:

  The (K355) Exhaust Differential Pressure Sensor signal is above 4.59 volts for 0.5 second.

Diagnostic Test

NOTE: If any Sensor Reference or Sensor Supply voltage DTCs are present, perform the applicable diagnostic procedure before continuing with this test.

NOTE: The jumper wire should still be in place.

NOTE: The jumper wire should still be in place.

NOTE: The scan tool should display an Exhaust Differential Pressure Sensor low voltage or short to ground DTC with the jumper wire in place.