Detroit DD13 EPA10 (2010-13) Fault Code: SPN 4335 FMI 7 (ACM) DEF Metering Unit Air Pressure – Low
DESCRIPTION:
Diesel exhaust fluid (DEF) metering unit air pressure low.
MONITORED PARAMETER:
Diesel exhaust fluid (DEF) metering unit air pressure.
TYPICAL ENABLING CONDITIONS:
1. Engine rpm greater than 500.
2. Dosing enabled.
MONITOR SEQUENCE:
None
EXECUTION FREQUENCY:
Continuous when enabling conditions met.
TYPICAL DURATION:
Six seconds
DASH LAMPS:
MIL
ENGINE REACTION:
Derate 25%
VERIFICATION:
SCR air pressure test (test duration is 60 seconds).
PROBABLE CAUSES:
1. Vehicle not reaching 100 PSI.
2. DEF metering unit air pressure sensor.
3. Pressure limiting valve.
4. Flush DEF system.
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