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Detroit DD16 EPA10 (2010-13) Fault Code: SPN 4334 FMI 17 (ACM) Diesel Exhaust Fluid (DEF) Purge Pressure High

DESCRIPTION:
Diesel exhaust fluid (DEF) purge pressure high.

MONITORED PARAMETER:
Diesel exhaust fluid (DEF) purge pressure.

TYPICAL ENABLING CONDITIONS:
1. Engine idle 1 minute.
2. Engine off.

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Continuous when enabling conditions met.

TYPICAL DURATION:
30 counts

DASH LAMPS:
MIL

VERIFICATION:
SCR quantity test.

NOTE: After repair is complete, fault must be cleared using the diagnostic service tool.

PROBABLE CAUSES:
1. DEF pressure sensor failure.
2. DEF pressure sensor connector/harness.
3. Check air line routing for the Pressure Limiting Valve (PLV), DEF pump, and metering unit for kinks/blockage.
4. DEF return line blocked/kinked.
5. DEF nozzle failure.
6. DEF nozzle supply line blocked/kinked.

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