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 MANUALSVOLVO1991940 TURBO, 4D SEDAN, AW71REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSFUEL SYSTEMFUEL CONTROLFUEL INJECTORS (NON-TURBO)
1991 Volvo 940 Turbo, 4D Sedan, AW71
Fuel Injectors (Non-Turbo)
1991 Volvo 940 Turbo, 4D Sedan, AW71SECTION Fuel Injectors (Non-Turbo)
- Remove auxiliary relay, located on left front fender panel. Jumper relay terminals No. 2 and 3. Connect ohmmeter between fuel injection ECU terminals No. 9 and 18. Resistance should be 4 ohms. If resistance is 5.3 ohms, one injector or wire is faulty.
- If resistance is 8.0 ohms, 2 injectors or wires are faulty. If resistance is 16 ohms, 3 injectors or wires are faulty. To check injectors individually, disconnect injector wires and place ohmmeter across suspected injector. Resistance should be 16 ohms. Replace as necessary.
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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.