The following components are connected to a common 12V supply
1) A138: DEF Direction valve
2) A138: Aftertreatment Diesel Exhaust Fluid (DEF) Pump Motor
3) 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
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[03.2024] Volvo Techtool PTT 2.8.241+ACPI 0.7.1.0 High Level+Devtool
Conditions for diagnostic trouble code (DTC):
1) Open circuit
Observable symptoms
1) None
Probable cause
1) Wiring harness
2) Connector
3)A138: DEF Direction valve
4) A138: Aftertreatment Diesel Exhaust Fluid(DEF) Pump Motor
5) Y81: Aftertreatment Diesel Exhaust Fluid(DEF) Tank Heater Valve
6)A137: Aftertreatment Control Module (ACM)
