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 TESTSRELAYSFUEL INJECTION MAIN RELAY
1991 Volvo 940 Turbo, 4D Sedan, AW71
Fuel Injection Main Relay
1991 Volvo 940 Turbo, 4D Sedan, AW71SECTION Fuel Injection Main Relay
Connect voltmeter between fuel injection ECU terminal No. 9 and ground. Connect a jumper wire between fuel injection ECU terminal No. 21 and ground. Relay should close and voltmeter should indicate battery voltage. Replace as necessary.
RENDER: 1.0x
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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.