ABS Modulator IV-Valve Short Circuit to UB Detection / Power Driver Break Down Detection (FA right)
- Check wiring of the relevant ABS-valve (short to UB ?) - Check relevant actuator (internal short circuit ?). - Replace the ABS-ECU module, if the wiring and the relevant ABS-valve is faultless
What you'll see
No driver-visible symptom recorded.
System reaction
ABS function at all wheels is switched off ATC brake control is switched off ATC engine control is still available HSA is deactivated EBL is deactivated Drag Torque Control is deactivated
Diagnostic depth
Two failure causes possible: 1) A short circuit to UB of the inlet valve line on the right front ABS Modulator was detected. 2) Internal failure detection: A 'break down' on one of the two right front ABS Modulator Power Drivers (EV or AV) was detected.
- wiring of the relevant ABS-valve is shorted to UB - relevant actuator has internal short circuit. - ABS-ECU defective