Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLVO1996850 BASE, 4D WAGON, STANDARD, M59REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTING - TURBOFUEL SYSTEMFUEL PUMP
1996 Volvo 850 Base, 4D Wagon, Standard, M59
Fuel Pump
1996 Volvo 850 Base, 4D Wagon, Standard, M59SECTION Fuel Pump
- If fuel pump does not operate with ignition on, remove fuel pump relay. Connect jumper wire between fuel pump relay terminals No. 1 and 3. See Figure . 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 Figure . 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 Figure . 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 fuel pump relay terminal No. 3. See Figure . 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 Figure . 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. If wiring is okay, replace ECM.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.