Checking components and wiring

Check the leak diagnostic unit connectors. Check for contact resistance and oxidation.

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 #B7 (#B17) and leak diagnostic pump terminal #1. Check for an open-circuit.

Check the power supply cable between system relay terminal #5 and leak diagnostic unit terminal #4. Check for an open-circuit.

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.