Checking the wiring

Check the signal cable. Check for a short-circuit to supply voltage.

Take readings between:

• Engine control module (ECM) #B34 (#C44) and leakage diagnostic unit #2.

Remedy as necessary.

Other information 

• See Connecting the breakout box
• For information about signals for 5 cylinder engines: Signal specification or Signal specification
• See Leak diagnostic pump, replacing
• See Contents

Fig 1: Identifying Leak Diagnostic Unit Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Leak Diagnostic Pump

Courtesy of VOLVO CARS OF NORTH AMERICA.

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  Refer to Information