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 - TESTS W/CODESSELF-DIAGNOSTICS - IGNITION SYSTEMFAULT CODE TESTINGCODE 2-3-4 (THROTTLE SWITCH SIGNAL)
1991 Volvo 940 Turbo, 4D Sedan, AW71
Code 2-3-4 (Throttle Switch Signal)
1991 Volvo 940 Turbo, 4D Sedan, AW71SECTION Code 2-3-4 (Throttle Switch Signal)
- Turn ignition off. Connect an ohmmeter between terminal No. 7 (Yellow/White wire on 240 Series; Orange wire on all others) of ignition system ECU connector. Reading should be zero ohms.
- Press accelerator pedal slightly to open throttle switch. Reading should be infinite. If resistance is not as specified, check resistance at throttle switch. For throttle switch testing and adjustment, see SYSTEM/COMPONENT TESTS article in the ENGINE PERFORMANCE Section.
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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.