Symptom 4 (Medium Duty): Spn 3719 Or Spn 3936 And Other Active Fault Codes - Navistar MaxxForce DT Diagnostic Manual

DIAGNOSTIC MANUAL
3.5. SYMPTOM 4 (MEDIUM DUTY): SPN 3719 OR SPN 3936 AND OTHER ACTIVE
FAULT CODES
NOTE – Before beginning the following step-based diagnostics, perform all vehicle operational checks
page 5.
Step
1 Using Electronic Service Tool (EST) with ServiceMaxx™ software,
check Diagnostic Trouble Code (DTC) list for active fault code(s) other
than SPN 3719 (DPF soot load).
Are fault code(s) other than SPN 3719 or SPN 3936 active?
Step
2 Using Electronic Service Tool (EST) with ServiceMaxx™ software,
check Diagnostic Trouble Code (DTC) list to determine which of the
following fault codes is active: SPN 3719 FMI 0, 15, or 16.
Which fault code is active?
Step
3 Do three Onboard Filter Cleanliness Tests (OBFCT) to decrease
soot load of Diesel Particulate Filter (DPF). Using EST, go to Tests >
KOER Aftertreatment Tests > Onboard Filter Cleanliness Test. After
OBFCTs are complete, check DTC list to determine if SPN 3719 FMI
0 dropped one FMI level to SPN 3719 FMI 16.
Did SPN 3719 FMI 0 drop one FMI level to SPN 3719 FMI 16?
34
Action
Action
Action
https://www.truck-manuals.net/
Decision
Yes: Repair other active
fault code(s) (See Electronic
Control Systems Diagnostics
in Engine Diagnostic
Manual). After repairs
are complete, go to step 2.
No: Go to step 2
Decision
SPN 3719 or SPN 3936 FMI
0: Go to step 3
SPN 3719 or SPN 3936 FMI
16: Go to step 5
SPN 3719 or SPN 3936 FMI
15: Go to step 6
Decision
Yes: Go to step 5
No: Go to step 4