Navistar MaxxForce DT Diagnostic Manual page 85

Step
3 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 DPF. This is to be done prior to
removing the DPF.
1. The transmission must be in neutral and the
parking brake applied.
2. Start and idle the engine.
3. Rapidly snap the accelerator pedal from idle to full
throttle. This can be performed multiple times.
4. During the engine accelerations, visually check for
a heavy black smoke exiting the exhaust pipe.
Is black smoke visible?
Step
4 Using Electronic Service Tool (EST) with ServiceMaxx™
software, check Diagnostic Trouble Code (DTC) list for engine
overspeed fault code(s).
Are engine overspeed fault code(s) active?
Step
5 Check for an engine no start. Turn ignition switch to ON position
and crank engine for a maximum of 20 seconds. If engine
does not start, wait 2 to 3 minutes and crank engine again for a
maximum of 20 seconds.
Does the engine start and run?
Action
Action
Action
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DIAGNOSTIC MANUAL
Decision
Yes: Go to Symptom 5 (Heavy
Duty): Black smoke page 113.
No: Go to Symptom 1 (Heavy Duty):
Frequent Parked Regens with No
Active Codes (More than one parked
regen per day) page 83.
Decision
Yes: Repair engine overspeed fault
code(s) (See Electronic Control
Systems Diagnostics in Engine
Diagnostic Manual). After repairs
are complete, go to step 5.
No: Go to step 5
Decision
Yes: Go to step 6
No: Go to Symptom 2 (Heavy Duty):
Engine No Start / Starts and Stalls
page 91.
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