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DESCRIPTION:
Diesel Exhaust Fluid (DEF) dosing valve circuit failed open.
MONITORED PARAMETER:
DEF dosing valve.
TYPICAL ENABLING CONDITIONS:
Always enabled
MONITOR SEQUENCE:
None
EXECUTION FREQUENCY:
Always enabled
TYPICAL DURATION:
2 seconds
DASH LAMPS:
1. MIL
2. CEL
ENGINE REACTION:
Derate 25%
VERIFICATION:
Engine Idle (1 minute).
PROBABLE CAUSES:
1. DEF doser valve harness connector.
2. DEF metering unit failure.
3. Wiring between DEF doser valve harness and the ECM.
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