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.
1989 Volvo 780 GLE, AW71FACTORY OEM SERVICE PROCEDURE
Fuel Injection System (Fuel Pump) Relay Test
With relay removed, apply battery voltage to terminal No. 85 and ground to terminal No. 86/2. See Figure . Continuity should be present between terminals No. 30 and 87/2. If not, replace fuel injection system relay.
Factory Service Tools
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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.