Checking the wiring and sensor

Check the wiring between pre-pressure valve connection:

• #3 and control unit #1 (#A1)
• #4 and control unit #17 (#A17)

for an open circuit as described in Open-circuit, permanent faults , a short circuit to ground as described in Short-circuit to ground, permanent faults , and a short circuit to voltage supply as described in Short-circuit to supply voltage. Permanent faults .

HINT: Check the pressure build-up valve with the ignition off, the Anti-lock brake system module (ABS) disconnected and the breakout box connected. Measure the resistance between terminals #1 and #17 on the breakout box. The resistance should be approximately 3 Ω. 

Do the necessary corrective action.

Additional information: 

• To connect the test box, see Connecting the ABS/DSTC breakout box .
• To replace the pre-pressure valve (brake booster) see Power brake booster (DSTC), replacing ; for right-hand drive cars see Replacing the power brake booster (DSTC) .
• For information on signals, see Signal specification, ABS / DSTC (dynamic stability and traction control) control module .

Fig 1: Identifying Active Yaw Control Sensor Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Was a fault detected? 

• YES 

  Refer to Verification 

• NO 

  FAULT NOT FOUND:  Troubleshooting has been completed.