Fuel Pump Relay
- Remove fuel pump relay from fuse/relay box. On C70, S70 and V70, fuel pump relay is located in electrical distribution box in engine compartment. On S90 and V90, fuel pump relay is located in electrical distribution box on left side of instrument panel. Connect jumper wire between fuel pump relay terminals No. 1 and 3. See Fig 1. Turn ignition on. If fuel pump does not start, go to next step. If fuel pump starts, replace fuel pump relay.
- Turn ignition off. To check relay ground, connect ohmmeter between ground and fuel pump relay terminal No. 2. See Fig 1. Ohmmeter should indicate about zero ohms. If ohmmeter does not indicate about zero ohms, check wiring between fuel pump relay and ground.
- To check fuel pump relay voltage supply, connect voltmeter between ground and fuel pump relay terminal No. 1. See Fig 1. Turn ignition on. Battery voltage should be present. If battery voltage is not present, check wiring between fuel pump relay and fuse No. 2.
- Turn ignition off. Connect ohmmeter between ground and relay terminal No. 3. See Fig 1. About 1.5 ohms should be present. If about 1.5 ohms are not present, check resistance at fuel pump connector to determine whether fault is in pump or wiring.
- To check fuel injection control signal to fuel pump relay, connect voltmeter between ground and fuel pump relay terminal No. 4. See Fig 1. Operate starter motor. If voltmeter indicates about 3 volts, replace relay. If voltage is not to specification, check wiring between fuel pump relay and ECM.
Courtesy of VOLVO CARS OF NORTH AMERICA.