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 Contents
For resistance values, see Component specifications
To connect the breakout box, see Connecting the breakout box
For information about signals on 5 cylinder engines, see Signal specification
For information about signals for 6 cylinder engines:
- For 6 cylinder engines -2001, see Signal specification
- For 6 cylinder engines 2002-, see Signal specification
- For 6 cylinder engines -2004, see Signal specification
- For 6 cylinder engines 2005-, 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 OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Leak Diagnostic Pump

Courtesy of VOLVO CARS OF NORTH AMERICA.