Checking Components And Wiring

Check the fuse for the circuit.

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

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

Check the signal cable between engine control module (ECM) terminal #B46 (#C46) and leak diagnostic pump terminal #3. 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 CONNECTING THE BREAKOUT BOX
• see SIGNAL SPECIFICATION
• see COMPONENT SPECIFICATIONS
• see LEAK DIAGNOSTIC PUMP
• see CONTENTS

Fig 1: Identifying Leak Diagnostic Unit Connector Terminals

Courtesy of VOLVO CARS CORPORATION

Fig 2: Identifying Volvo Leak Detection Pump (Leak Diagnostic Unit)

Courtesy of VOLVO CARS CORPORATION

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  Refer to VERIFICATION