DESCRIPTION:
Selective Catalyst Reduction (SCR) outlet temperature sensor circuit failed low.
MONITORED PARAMETER:
SCR outlet temperature sensor.
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).
NOTE: If code 3246-15 active, fix that first.
PROBABLE CAUSES:
1. Inspect all connectors and wiring upstream of the ACM (SCR inlet temp, ATD harness 10-pin connector, VIH 47-pin connector, and ECM 120-pin connector).
2. SCR outlet temperature sensor.
3. SCR outlet temperature sensor connector/harness.
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