Check the wiring harness around the injection pump for chafing or broken wires.
Fault 17969 VW engine control unit - Status B
Precondition
The controller detects that there is an excessive control deviation in the quantity adjuster OB3 (N146). The quality adjuster (OB3) is inside of the injection pump.
Status B means that the fault is present intermittently.
Effect on the truck
1. Preheating signal lamp flashes
2. Inadequate handling
3. Engine stalls
Possible causes
1. Connections between quantity adjuster OB3 (N146) and VW engine control unit (N1:99, N1:106, N1:108, N1:116, N1:121) shorted or faulty.
2. Check piston displacement sensor OB3 and quantity adjuster OB3.
3. Injection pump defective.
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