IK0700032

IK0700032 - DPF Snap Accel Test ­ Quick Test
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IK0700032
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8/3/2011
Steve
Kueller
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Title : DPF Snap Accel Test - Quick Test
Applies To : All vehicles with DPFs
Diesel Particulate Filter ( DPF) Snap Acceleration Test (Quick Test)
This procedure checks the DPF for cracks or internal damage without removing the DPF from the vehicle and is
used to test basic functionality of the diesel particulate filter. This is to be done prior to removing the DPF.
Check for active DTC prior to performing this procedure. If any active DTCs are present, follow the appropriate
DTC troubleshooting.
TEST PROCEDURES
WARNING:
To prevent unexpected movement of the vehicle and possible serious personal injury or death, park the vehicle on a flat,
level surface, set the parking brake, turn the engine off and chock the wheels to prevent vehicle from moving in both
directions.
1.
2.
3.
4.
The transmission must be in neutral and the parking brake must be applied.
Start and idle the engine.
Rapidly depress the accelerator pedal from idle to full throttle. This can be performed multiple times.
During the engine accelerations, visually check for a heavy black smoke exiting the exhaust pipe.
a. Visible black smoke indicates a possibly failed diesel particulate filter.
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IK0700032 - DPF Snap Accel Test ­ Quick Test
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b. If black smoke is present, capture a photo of the smoke then remove the DPF and inspect internally
for cracks other damage. A photo of the smoke and of the outlet of the DPF is required for a DPF
iApprove.
c. If white smoke is seen, this does not indicate a failure of the DPF. If white smoke is present, Air
Management diagnostics should be performed.
NOTE: There is a phenomenon called "hydrocarbon slip" that can occur under certain conditions. "Hydrocarbon slip" is when
diesel fuel does not fully combust in the aftertreatment (during regeneration) and "slips" through the DPF and into the clean side
of the exhaust. This is usually associated with high idle time applications. A black staining in the exhaust can develop in the
tailpipe. The DPF should NOT be replaced due to "hydrocarbon slip".
NOTE: The DPF is not 100 percent efficient. Some evidence of exhaust soot is normal, and does not indicate a malfunctioning
DPF.
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