Aftertreatment System Fault Codes; Maxxforce ® Dt, 9 And 10 (Epa 10) - Navistar MaxxForce DT Diagnostic Manual

AFTERTREATMENT SYSTEM FAULT CODES

7.1. MAXXFORCE ® DT, 9 AND 10 (EPA 10)
FMI
SPN
3242 2
3242 3
3242 4
3246 2
3246 3
3246 4
3246 7
3246 20
3251 2
3251 3
3251 4
3251 10
Condition
DPFIT signal does not agree with
other exhaust sensors
DPFIT signal Out of Range HIGH
DPFIT signal Out of Range LOW
DPFOT signal does not agree with
other exhaust sensors
DPFOT signal Out of Range HIGH
DPFOT signal Out of Range LOW
DPFOT not warming along with
engine
DPF over temperature - possible
filter damage
DPFDP above or below desired level •
DPFDP signal Out of Range HIGH
DPFDP signal Out of Range LOW
DPFDP signal abnormal rate of
change
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DIAGNOSTIC MANUAL
Possible Causes
• Biased DPFIT circuit or sensor
• DPFIT signal OPEN or short to PWR
• SIG GND circuit OPEN
• Failed DPFIT sensor
• DPFIT signal circuit short to GND
• Failed DPFIT sensor
• Biased DPFOT sensor or circuit
• DPFOT signal circuit OPEN or short to
PWR
• SIG GND circuit OPEN
• Failed DPFOT sensor
• DPFOT signal circuit short to GND
• Failed DPFOT sensor
• Biased DPFOT circuit or sensor
• Restricted DPF
• DOC Failure
• Engine over fueling
• Downstream Injection over fueling
• Biased DPFOT sensor or circuit
Biased DPFDP sensor or circuit
• Restricted or plugged DPF
• Reversed DPF sensor hoses
• DPFDP signal circuit short to PWR
• SIG GND circuit OPEN
• Failed DPFDP sensor
• Reversed DPFDP sensor hoses
• DPFDP signal circuit OPEN or short to
GND
• Failed DPFDP sensor
• DPFDP sensor tubes restricted or open
• Biased DPFDP circuit or sensor
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