Diagnostic help

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.

Fig 1: Valve Block Function Flow Diagram

Courtesy of SAAB-SCANIA OF AMERICA, INC.

1. Front left pressure increase valve
2. Front right pressure increase valve
3. Pressure relief valve, front left
4. Front right pressure relief valve
5. Return pump
6. Brake caliper, front left
7. Brake caliper, front right
8. Brake caliper, rear left
9. Brake caliper, rear right
10. Front left inlet valve
11. Front right inlet valve
12. Rear left inlet valve
13. Rear right inlet valve
14. Front left outlet valve
15. Front right outlet valve
16. Rear left outlet valve
17. Rear right outlet valve
18. Accumulator chamber
19. Brake pressure sensor
20. Check valve
21. Check valve