The following components are connected to a common 12?V supply
R31: Aftertreatment Diesel Exhaust Fluid (DEF) Line Heater 1
R29: Aftertreatment Diesel Exhaust Fluid (DEF) Line Heater 3
A138: Aftertreatment Diesel Exhaust Fluid (DEF) Return Valve
A138: Aftertreatment Diesel Exhaust Fluid (DEF) Pump Motor
Y81: Aftertreatment Diesel Exhaust Fluid (DEF) Tank Heater Valve
If an abnormal voltage or current is detected on the common supply a DTC is set
Conditions for diagnostic trouble code (DTC):
1) The voltage at pin A137:44 is above normal value
Observable symptoms
1) None
Probable cause
1) Wiring harness
2) Connector
3) R31: Aftertreatment Diesel Exhaust Fluid (DEF) Line Heater 1
4) R29: Aftertreatment Diesel Exhaust Fluid (DEF) Line Heater 3
5) A138: Aftertreatment Diesel Exhaust Fluid (DEF) Return Valve
6) A138: Aftertreatment Diesel Exhaust Fluid (DEF) Pump Motor
7) Y81: Aftertreatment Diesel Exhaust Fluid (DEF) Tank Heater Valve
8) A137: Aftertreatment Control Module (ACM)
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