Checking the function of the pump motor

Fig 1: Engine Start Verification

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Start the engine.

  Check if the pump motor in the unit for four wheel drive (Active on Demand Coupling) starts and runs normally.

  HINT: The motor must hum and vibrate slightly. Listen using a stethoscope or a screwdriver pressed to your ear 

  Fig 2: Locating Active On Demand Coupling Pump Motor

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Is the oil pump motor working? 

• YES 

  FAULT NOT FOUND:  Troubleshooting has been completed.

• NO 

  Refer to Checking the power supply