Fuel Pump Circuit

If fuel pumps do not operate with ignition on, connect Measuring Unit (999-3070 ) to ECU. See Fig 1 . Connect voltmeter between terminals No. 3 and 19. Voltmeter should indicate battery voltage. If battery voltage is not present, check wiring and voltage supply to pump relay. If voltage is present, check wiring and voltage supply to fuel pump.

Fig 1: Connecting Measuring Unit To ECU

Courtesy of VOLVO CARS OF NORTH AMERICA.