Checking Components And Wiring

Check the resistance of the valve between the leak diagnostic unit connector terminals #3 and #4 (leak diagnostic pump side).

Check the signal cable between control module terminal #B40 (#B50) and leak diagnostic unit terminal #3. Check for a short-circuit to supply voltage.

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

Remedy as necessary.

Other information:

see CHECKING WIRING AND TERMINALS
For resistance values, see COMPONENT SPECIFICATIONS
To connect the breakout box, see CONNECTING THE BREAKOUT BOX
For 5 cylinder turbocharged engines -2004, see SIGNAL DESCRIPTION
For 6 cylinder engines -2004, see SIGNAL SPECIFICATION
To access or replace the leak diagnostic unit, see LEAK DIAGNOSTIC PUMP, REPLACING .

Fig 1: Identifying Leak Diagnostic Unit Connector Terminals

Courtesy of VOLVO CARS CORPORATION

Fig 2: Identifying Ohm Meter

Courtesy of VOLVO CARS CORPORATION

Fig 3: Identifying Leak Diagnostic Pump

Courtesy of VOLVO CARS CORPORATION