MAN TG3 Fuel Prefilter Heating Wiring Diagram – TGX/TGS Euro 6d (Q4 2020)

This official wiring schematic covers the Fuel Prefilter Heating System (Kraftstoffvorfilterheizung – PTC) in MAN TG3 TGX/TGS Euro 6d trucks. Released by MAN Truck & Bus SE (Werk München), Q4 2020, the schematic outlines the connection between the preheater control unit, fuse, relay, CAN bus, and diagnostic interfaces.

🧊 System coverage includes:

• AP008 (A1188.1) & A1108 (A1188.2) – Fuel Prefilter Heaters (PTC)

• Relay K299 (K177.1) – Fuel heating control relay

• Fuse F197 (F1547.1) – Preheater fuse

• RIO Module (AP020 / A1358.1) – CAN communication & feedback paths

• CAN High/Low: A/62 & A/63

• Diagnostic and supply terminals:

  • A/1: Terminal 30

  • A/2: Terminal 31

  • A/3: Diagnostic Line

  • A/17: Heater feedback

📎 Additional details:

• Located in the frame harness left/right (X6616.1A1 / X6616.2A1)

• Heater variants from Hengst, Separ, and UFI

• MAN harness part numbers: 81.25435-6167, 81.25432-6220

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