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.
1993 Volvo 850 AutomaticFACTORY OEM SERVICE PROCEDURE
Fuel Injectors
- Remove fuel injector cover. Connect an ohmmeter between injector terminals. Injector resistance should be 15.6-16.2 ohms. If not, replace injector. If resistance is okay, disconnect injector connector. Connect voltmeter between connector terminals. Operate starter motor. Voltmeter should indicate 300-700 millivolts, depending on engine temperature.
- If voltage is not to specification, connect voltmeter between injector connector terminal No. 1 (Green wire) and ground. If battery voltage is present, see ELECTRONIC CONTROL UNIT - FUEL INJECTION under COMPUTERIZED ENGINE CONTROLS.
- If battery voltage is not present, remove main relay from engine compartment relay base. Connect voltmeter between ground and relay connector terminal No. 4, then between ground and relay connector terminal No. 2. If battery voltage is present in both instances, go to next step. If battery voltage is not present, check relay voltage supply from battery.
- Turn ignition on. Reinstall relay in base. Relay should click. If relay does not click, see ELECTRONIC CONTROL UNIT - FUEL INJECTION under COMPUTERIZED ENGINE CONTROLS.
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.
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