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.
Detroit DD16 EPA10 (2010-13) Fault Code: SPN 4335 FMI 4 (ACM) Diesel Exhaust Fluid Metering Unit Air Pressure Sensor Circuit Failed Low
Detroit DD16 EPA10 (2010-13) Fault Code: SPN 4335 FMI 3 (ACM) Diesel Exhaust Fluid Metering Unit Air Pressure Sensor Circuit Failed High
Detroit DD16 EPA10 (2010-13) Fault Code: SPN 4335 FMI 2 (ACM) Diesel Exhaust Fluid Air Pressure Sensor – Drift
Detroit DD16 EPA10 (2010-13) Fault Code: SPN 4335 FMI 1 (ACM) Diesel Exhaust Fluid Air Pressure Not Detected (from Vehicle Supply)
Detroit DD16 EPA10 (2010-13) Fault Code: SPN 4334 FMI 17 (ACM) Diesel Exhaust Fluid (DEF) Purge Pressure High
Detroit DD16 EPA10 (2010-13) Fault Code: SPN 4334 FMI 7 (ACM) DEF Pressure Low