Checking The Component And Wiring

Check the resistance of the pump motor between the leak diagnostic unit connector terminals #1 and #4 (leak diagnostic pump side).

Check the signal cable between engine control module (ECM) terminal #B33 (#C33) and leak diagnostic unit terminal #1. Check for a short-circuit to ground.

Try a new leak diagnostic unit if no fault is found during the above fault-tracing.

Remedy as necessary.

Other information 

• see CONNECTING THE BREAKOUT BOX
• see SIGNAL SPECIFICATION
• see COMPONENT SPECIFICATIONS
• see LEAK DIAGNOSTIC PUMP
• see CHECKING WIRING AND TERMINALS

Fig 1: Identifying Leak Diagnostic Unit Connector Terminals

Courtesy of VOLVO CARS CORPORATION

Fig 2: Identifying Leak Diagnostic Pump

Courtesy of VOLVO CARS CORPORATION

• Continue 

  Refer to INFORMATION