DESCRIPTION:
Diesel exhaust fluid (DEF) unit – unable to clear restriction.
MONITORED PARAMETER:
1. DEF pressure.
2. DEF air pressure.
TYPICAL ENABLING CONDITIONS:
Dosing enabled
MONITOR SEQUENCE:
SPN 4335/14 and 31 active.
EXECUTION FREQUENCY:
Continuous when enabling conditions met.
DASH LAMPS:
1. MIL
2. CEL
ENGINE REACTION:
Derate 25%
VERIFICATION:
Selective catalyst reduction (SCR) quantity test.
PROBABLE CAUSES:
1. Failed DEF pressure sensor.
2. DEF metering unit air inlet restricted.
3. Flush the DEF system.
4. Failed diffuser heater.
5. Failed DEF nozzle.
6. Failed supply hose for DEF.
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