Aftertreatment System Fault Codes; Maxxforce 11, 13 And - Navistar MaxxForce DT Diagnostic Manual

AFTERTREATMENT SYSTEM FAULT CODES

13.1. MAXXFORCE ®
FMI
SPN
3251 0
3251 14
3251 21
3471 1
3471 7
3480 0
11, 13 AND 15
Condition
DPFDP excessively HIGH (Plugged
filter)
DPFDP sensor pressure hoses
reversed
DPFDP excessively LOW
(Sensor/circuit fault or missing
DPF)
Fuel Pressure 1 below desired (Low
system pressure)
Fuel Doser Valve not responding as
expected
AFTFP1 too high while dosing
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DIAGNOSTIC MANUAL
Possible Causes
• Restricted Diesel Particulate Filter (DPF)
• Low Fuel Delivery Pressure
• Restricted Aftertreatment Fuel Injector
(AFI) unit
• Parked Regen Inhibited
• Exhaust leak(s)
• Biased Diesel Particulate Filter
Differential Pressure (DPFDP) sensor
• Biased IMP sensor
• Low boost pressure
• DPFDP sensor pressure hoses reversed
• DPFDP sensor hose (before filter)
restricted
• Biased DPFDP sensor or circuit
• Cracked DPF
• DPFDP sensor pressure hoses reversed
• DPFDP sensor hose (before filter) leaking
or disconnected
• Aftertreatment Fuel Doser (AFTFD)
failure. Blocked, stuck open, or closed
• Leak in AFTFD fuel supply line
• Failed Aftertreatment Fuel Pressure 1
(AFTFP1) sensor
• Aftertreatment Fuel Shutoff Valve
(AFTFSV) stuck closed, or blocked
• AFTFD failure. Blocked, stuck open, or
closed.
• Stuck AFI or AFTFSV
• Biased AFT Fuel Pressure 2 signal
• Fuel Delivery Pressure (FDP) above
maximum
• Restricted fuel return line between filter
housing and fuel tank
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