Dpf Status Test - Navistar MaxxForce DT Diagnostic Manual

DPF Status Test

This test checks the status of the DPF if the Soot level is within a Regen Needed limit. The test will automatically
start a Parked Regen.
NOTE – The KOER Standard Test must be run before performing this test.
This test will perform a complete Parked Regen.
Engine speed is ramped up to increase exhaust flow through the DPF while the DPFDP sensor monitors the
pressure difference across the DPF. The test runs for about 15 minutes. If a Regen is needed, the engine ramps
up for another 15 minutes, but this time to run DPF Regen cycle.
The following conditions are required for a Onboard Filter Cleanliness Test.
• Engine Running
• Engine Coolant Temperature is above or at least 170ºF (75ºC)
• Vehicle stationary
• Inhibit DTCs must not be active: Go to Regen Inhibitors page 152
• PTO not active (switch must be off)
• Regen inhibit switch not active (switch must be off)
• Parking brake must be applied
• Brake pedal not depressed
• Accelerator pedal not depressed
• Driveline disengaged
• If the Soot level is within normal range, the test completes and displays "Test Completed Successful." This
test does not give pass or fail results. The test only allows the operation of the aftertreatment system to be
validated by monitoring the effects of DOCIT, DOCOT, DPFOT, and DPFDP sensor.
• If the test is aborted, go to Regen Inhibitors page 152. If no regen inhibitors are identified, go to appropriate
aftertreatment system diagnostics section in this manual.
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