DIAGNOSTIC MANUAL
Step
Action
Decision
4
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?
Yes: Go to step 5
No: Go to
symptom 2
(Medium Duty):
Engine No Start /
Starts and Stalls
page 17.
Step
Action
Decision
5
Using Electronic Service Tool (EST) with ServiceMaxx™ software, check
Diagnostic Trouble Code (DTC) list for SPN 3719 FMI 0, 15, and 16 (DPF
Soot Load).
Is SPN 3719 or SPN 3936 with FMI 0, 15, or 16 the only fault code(s) active?
Yes: Go to
Symptom 3
(Medium Duty):
SPN 3719 or
SPN 3936 Active
Only or Frequent
Regens page 24.
No: Go to
Symptom 4
(Medium Duty):
SPN 3719 or
SPN 3936 and
Other Active Fault
Codes page 34.
7
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