Checking components and wiring

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

Check the signal cable from engine control module (ECM) terminal #B40 (#B50) to leak diagnostic pump terminal #3. Check for a short-circuit to supply voltage.

Check the engine control module (ECM) and leak diagnostic pump connectors. Check for contact resistance and oxidation.

Remedy as necessary.

Other information: 

• To connect the breakout box, see Connecting the breakout box
• For information about signals, see Signal specification
• To access or replace the leak diagnostic unit, see Leak diagnostic unit, replacing
• To fault-trace the wiring and terminals, see Contents .

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.

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  Refer to Verification