Fault-tracing information

Condition 

Fig 1: Identifying Active On Demand Pump Motor

Courtesy of VOLVO CARS OF NORTH AMERICA.

No diagnostic trouble codes (DTCs) stored in the control module for four wheel drive (Active on Demand Coupling).

Possible Source 

• Faulty power supply
• Defective pump motor.

Fault symptom[s] 

• No four wheel drive.