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 MANUALSVOLVO1993940 TURBO, 4D SEDAN, AW71REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTSCOMPUTERIZED ENGINE CONTROLSELECTRONIC CONTROL UNIT - IGNITIONPRELIMINARY CHECKS
1993 Volvo 940 Turbo, 4D Sedan, AW71
Preliminary Checks
1993 Volvo 940 Turbo, 4D Sedan, AW71SECTION Preliminary Checks
- Turn ignition off. Disconnect ignition ECU connector. 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 terminal identification numbers. Visually inspect all terminal connector sleeves to ensure all terminals are at same height.
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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.