Possible fault causes

• Short circuit to B+ in control line for DME (DFI) control unit → Fuel pump control unit
• Short circuit to ground in control line for DME (DFI) control unit → Fuel pump control unit
• Fuel pump control unit faulty

• Fault in electric fuel pump area (See)
• Short circuit to ground in control line for DME (DFI) control unit → Fuel pump control unit
• Fuel pump control unit faulty

INFORMATION 

• If the fuel pump control unit detects an external or internal fault, it connects the control line to ground for a certain time.
• This short circuit to ground is recognized as the fault type >>Below limit value<<, just like an actual short circuit to ground in the control line.