Checking The Component

Fig 1: Checking Traffic Load On CAN Cables

Courtesy of VOLVO CARS CORPORATION

• Ignition off.
• Check the connectors of the brake control module (BCM) and the pressure build-up valve/pedal pressure sensor for contact resistance and oxidation.
• Reinstall the connectors, components etc.
• Ignition on.
• Activate the pressure build-up valve.

  A mechanical noise should be heard from the engine compartment and the brake pedal should move slightly.

  Is the function incorrect, check cables for open circuit, short-circuiting to ground as well as short-circuiting to voltage.

  Take readings between:

  • Brake control module (BCM) #31 (#A31) and pre-pressure valve #3.
  • Brake control module (BCM) #17 (#A17) and pre-pressure valve #4.

  HINT: Check the pressure build-up valve by (ignition off and pressure build-up valve/pedal pressure sensor's connector disconnected) measuring the resistance between the pressure build-up valve connector terminals #3 and #4. Resistance shall be approx. 3-5 Ω. 

  Other information 

  • see CHECKING WIRING AND TERMINALS
  Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

  Courtesy of VOLVO CARS CORPORATION

Was a fault detected? 

• YES 

  Refer to VERIFICATION 

• NO 

  Refer to REPLACING A COMPONENT