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.
Code 2-1-4 (Impulse Sensor Signal)
1991 Volvo 940 Turbo, 4D Sedan, AW71SECTION Code 2-1-4 (Impulse Sensor Signal)
- Turn ignition off. Connect an ohmmeter between terminals No. 10 (Blue/Yellow wire on 240 Series; Red or Blue wire on all others) and No. 23 (Yellow/Red wire on 240 Series; Red or Blue wire on all others).
- Resistance should be 215-265 ohms. If engine is hot, resistance could reach 280-300 ohms. If resistance is not as specified, check wiring. If wiring is okay, check sensor. See CONTROL FUNCTION NO. 2 under SELF-DIAGNOSTICS - IGNITION SYSTEM .
RENDER: 1.0x
NO RELATED
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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.