Navistar MaxxForce DT Diagnostic Manual page 80

DIAGNOSTIC MANUAL
3471 1
3471 7
3471 10
3479 3
3479 4
3480 3
3480 4
3482 3
3482 4
3512 14
3556 0
3556 1
3719 0
3719 15
76
Fuel Pressure 1 below desired (Low
system pressure)
AFT Fuel Doser Valve not responding
as expected
AFT Fuel Doser Valve abnormal rate
of change
AFT Fuel Doser Valve short to PWR
AFT Fuel Doser Valve short to GND
AFTFP1 signal Out of Range HIGH
AFTFP1 signal Out of Range LOW
AFT Fuel Shutoff Valve short to PWR •
AFT Fuel Shutoff Valve short to GND •
ACM VREF 1 and 2 voltage deviation •
AFTFP2 excessively high (Restricted
injection)
AFT Fuel Pressure 2 below desired
(Possible system leak)
DPF Soot Load – Highest (level 3/3)
DPF Soot Load – Lowest (level 1/3)
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• Lower fuel delivery pressure
• Restricted fuel filter
• AFT Fuel Shutoff Valve failure
• Biased AFT Fuel Pressure 1 sensor or
circuit
• Lower fuel delivery pressure
• Restricted fuel filter
• AFT Fuel Shutoff Valve failure
• Biased AFT Fuel Pressure 1 sensor or
circuit
• AFT Fuel Doser failure
• AFTFD circuit short to PWR
• Failed AFTFD
• AFTFD circuit OPEN or short to GND
• Failed AFTFD
• AFTFP1 signal circuit OPEN or short to
PWR
• Failed AFTFIS
• AFTFP1 signal circuit short to GND
• Failed AFTFIS
AFTFSV circuit OPEN or short to PWR
• Failed AFTFSV
AFTFSV circuit short to GND
• Failed AFTFSV
ACM VREF circuit short to PWR
• ACM VREF circuit short to GND
• • Failed sensor causing short to GND on
VREF circuit
• Hydrocarbon Injector assembly failure
(Plugged)
• Biased AFT Fuel Pressure 2 sensor or
circuit
• Fuel leak from metering unit
• Biased AFT Fuel Pressure 2 sensor or
circuit
• Level 3 DPF plugged
• Level 1 DPF Regen required