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Home >> Volvo >> 2004 >> V40 Base >> Repair and Diagnosis >> Brakes >> Traction Control >> Brake Control System - Design And Function >> Diagnostic Functions (2000-2004) >> Reading off the Volvo on-board diagnostic (OBD) system >> Activating components/functions

Activating components/functions

NOTE: Activation can only be carried out if the vehicle speed is 0 km/h. The activation will be cancelled at higher speeds.
No.  Component/function  Remarks 
1 PUMP MOTOR Activating the hydraulic modulator pump motor. Clearly audible noise from the ABS hydraulic modulator. Vibrations in the brake pedal when it is depressed.
2 OUTLET VALVE LF Activating the outlet valve for the left front wheel. "Clicking sound" in the ABS hydraulic modulator. The valve opens the connection between the brake caliper and the low-pressure side of the pump.
3 INLET VALVE LF Activating the inlet valve for the left front wheel. "Clicking sound" in the ABS hydraulic modulator. The valve closes the connection to the brake circuit.
4 OUTLET VALVE RF Activating the outlet valve for the right front wheel. "Clicking sound" in the ABS hydraulic modulator. The valve opens the connection between the brake caliper and the low-pressure side of the pump.
5 INLET VALVE RF Activating the inlet valve for the right front wheel. "Clicking sound" in the ABS hydraulic modulator. The valve closes the connection to the brake circuit.
6 OUTLET VALVE LR Activating the outlet valve for the left rear wheel. "Clicking sound" in the ABS hydraulic modulator. The valve opens the connection between the brake caliper and the low-pressure side of the pump.
7 INLET VALVE LR Activating the inlet valve for the left rear wheel. "Clicking sound" in the ABS hydraulic modulator. The valve closes the connection to the brake circuit.
8 OUTLET VALVE RR Activating the outlet valve for the right rear wheel. "Clicking sound" in the ABS hydraulic modulator. The valve opens the connection between the brake caliper and the low-pressure side of the pump.
9 INLET VALVE RR Activating the inlet valve for the right rear wheel. "Clicking sound" in the ABS hydraulic modulator. The valve closes the connection to the brake circuit.