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 MANUALSVOLVO1991740 BASE, 4D WAGON, AUTOMATIC, AW70LREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTSCOMPUTERIZED ENGINE CONTROLSELECTRONIC CONTROL UNIT (IGNITION)GROUND CIRCUIT CHECKS
1991 Volvo 740 Base, 4D Wagon, Automatic, AW70L
Ground Circuit Checks
1991 Volvo 740 Base, 4D Wagon, Automatic, AW70LSECTION Ground Circuit Checks
Turn ignition switch to OFF position. Connect ohmmeter between ignition control unit terminals No. 20 and 14, and ground. See Fig 1 . Resistance should be zero ohms.
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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.