Pre-Filling The Fuel System

NOTE: Voltage drop

Irreparable damage to control unit
Damage to control unit
Fault entries in the control unit
Control unit programming/coding is aborted
Malfunctions in the control unit, even during programming/coding
→ Switch off ignition before disconnecting the control unit.

→ Make sure that the power supply is not interrupted during programming/coding.

→ Connect the battery charger with at least > current 90 A to the vehicle battery.

Pre-fill the fuel system.
1. 1.1 > 9900 - PIWIS Tester 3 must now be connected.
2. 1.2 Switch on ignition and start the PIWIS Tester.
3. 1.3 Select Auxiliary heating control unit in the overview.
4. 1.4 Maintenance/repairs must then be selected.
5. 1.5 Pre-filling of the fuel line after components are replaced must now be selected. Then press Next.
6. 1.6 Select the relevant option:
  Auxiliary heating or control unit was replaced
  
  or
  
  Work was carried out on the fuel-carrying lines
  
  Press Next.
7. 1.7 Press F8 to start.