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 DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTSCOMPUTERIZED ENGINE CONTROLSELECTRONIC CONTROL UNIT (IGNITION)PRELIMINARY CHECKS
1991 Volvo 940 Turbo, 4D Sedan, AW71
Preliminary Checks
1991 Volvo 940 Turbo, 4D Sedan, AW71SECTION Preliminary Checks
- Turn ignition off. Disconnect ignition ECU connector. On 240 Series, ECU is located behind panel below glove box. On 740 and 940 Series, ECU is located behind panel on right side of accelerator pedal.
- On all models, push out clip and disconnect ECU connector. Remove cover from ECU connector exposing pin identification numbers. Visually inspect all pin connector sleeves to ensure all pins are at same height.
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.