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
Action
Decision
1
Check for an exhaust system restriction by performing the
following Exhaust System Restriction Test:
CAUTION
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?
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.
Step
Action
Decision
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?
Yes: Remove Pre-Diesel Oxidation
Catalyst (PDOC) and Diesel Oxidation
Catalyst (DOC), and then go to step 4.
No: Go to step 5
91
https://www.truck-manuals.net/
