VOLVOUU All Engines (2010 Emissions) Fault Code: SPN 3597 FMI 4 PID: PSID 119 ECU Power Output Supply Voltage #1ECU Power Output Supply Voltage #1

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 current at pin A137:44 is above normal value
2) The voltage at pin A137:44 is below normal value

Observable symptoms
1) Selective catalytic reduction (SCR) system does not function
2) Possible engine de-rate

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)