Checking connectors and wires

Check the connector of the ABS control unit and the relevant wheel sensor for contact resistance and oxidation, as described in Contact resistance and oxidation .

Check cabling and joints for a short circuit to ground, as described in Short-circuit to ground, permanent faults .

Check connectors and wiring insulation for damage.

Check that the wheel sensor wires are not in close proximity to sources of interference such as electric motors, ignition wires, mobile telephone leads etc.

Do the necessary corrective action.

Additional information: 

• For disconnection of the control unit connector, see Replacing the control module for ABS and dynamic stability and traction control (DSTC) .
• For the location of the wheel sensor contact device, see Wheel sensor, front, replacing .
• To connect the test box, see Connecting the ABS/DSTC breakout box .

Fig 1: Breakout Box

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Is there a fault? 

• YES 

  Refer to Verification 

• NO 

  Refer to Checking wheel sensor and sensor wheel