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 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