Valve block, ABS function: Diagnostics

The control module performs a valve test each time the ignition is switched on. This test takes place at the same time as the pump-motor test and the valves are actuated for 20 ms.

A fault in the left-hand front inlet/outlet valves will set diagnostic trouble code C2450.

A fault in the right-hand front inlet/outlet valves will set diagnostic trouble code C2455.

A fault in the left-hand rear inlet/outlet valves will set diagnostic trouble code C2415.

A fault in the right-hand front inlet/outlet valves will set diagnostic trouble code C2485.

A fault in the left-hand front pressure increase valve will set diagnostic trouble code C0141.

A fault in the left-hand front pressure-reducing valve will set diagnostic trouble code C0146.

A fault in the right-hand front pressure increase valve will set diagnostic trouble code C0151.

A fault in the right-hand front pressure-reducing valve will set diagnostic trouble code C0156.

In all the above cases, the TCS and ABS functions will be disabled and the warning lamps for ABS, brakes and TCS OFF will light up as well as the central warning lamp.