Symptom 2 (Heavy Duty): Engine No Start / Starts And Stalls - Navistar MaxxForce DT Diagnostic Manual

9.3. SYMPTOM 2 (HEAVY DUTY): ENGINE NO START / STARTS AND STALLS

NOTE – Before beginning the following step-based diagnostics, perform all vehicle operational checks
page 80.
Step
1 Check for an exhaust system restriction by performing the
following Exhaust System Restriction Test:
To prevent damage to the starter, if engine
fails to start within 20 seconds, release
ignition switch and wait 2 to 3 minutes to
allow starter motor to cool.
1. Turn ignition switch to ON position.
2. Using Electronic Service Tool (EST) with
ServiceMaxx™ software, go to Sessions >
Performance and select the record snapshot icon
from the toolbar.
3. Crank the engine for a maximum of 20 seconds
and then stop recording.
4. Use the playback feature in ServiceMaxx™
and graph Turbocharger 1 Turbine Outlet
Pressure (TC1TOP), and Diesel Particulate Filter
Differential Pressure (DPFDP) signal values.
5. Verify DPFDP and TC1TOP are within
specification. DPFDP signal value should be less
than 1 psi (7 kPa), and TC1TOP signal value
should be less than 5 psi (34 kPa).
Are DPFDP and TC1TOP signal values within specification?
Step
2 Determine if Diesel Particulate Filter (DPF) is contaminated.
Remove the DPF (see Exhaust System Service Manual), and
check for signs of lube oil and coolant contamination.
NOTE – A black staining in the exhaust tailpipe can occur
on applications that experience high idle times. This is
normal and the DPF should NOT be replaced.
Is the DPF contaminated?
Action
CAUTION
Action
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DIAGNOSTIC MANUAL
Decision
Both DPFDP and TC1TOP signals
High: Go to step 2
TC1TOP signal High Only: Go to step
3
Neither DPFDP or TC1TOP signal
High: Go to Hard Start and No
Start Diagnostics section in Engine
Diagnostic Manual. After repairs are
complete, go to step 7.
Decision
Yes: Remove Pre-Diesel Oxidation
Catalyst (PDOC) and Diesel Oxidation
Catalyst (DOC), and then go to step 4.
No: Go to step 5
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