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 MANUALSVOLVO1991240 BASE, 4D WAGON, AUTOMATIC, AW70LREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTSCOMPUTERIZED ENGINE CONTROLSELECTRONIC CONTROL UNIT (FUEL INJECTION)PRELIMINARY CHECKS
1991 Volvo 240 Base, 4D Wagon, Automatic, AW70L
Preliminary Checks
1991 Volvo 240 Base, 4D Wagon, Automatic, AW70LSECTION Preliminary Checks
- Turn ignition switch to OFF position. Disconnect fuel injection ECU connector. Fuel injection ECU is located on right side of instrument panel, under kick panel. Push out clip and disconnect ECU connector.
- Remove cover from ECU connector to expose pin identification numbers. Visually inspect all pin connector sleeves to ensure all pins 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.