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 DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSIDLE CONTROL SYSTEMIDLE AIR CONTROL VALVE
1991 Volvo 940 Turbo, 4D Sedan, AW71
Idle Air Control Valve
1991 Volvo 940 Turbo, 4D Sedan, AW71SECTION Idle Air Control Valve
- Turn ignition switch to OFF position. Disconnect ECU connector. Remove cover from ECU connector to expose pin identification numbers. On 240, 740 and 940 Series with 2.4 Jetronic fuel system, connect an ohmmeter between fuel injection ECU pins No. 9 and 33.
- Ohmmeter should read 8 ohms. On 740 Series with Regina fuel injection system, connect ohmmeter between fuel injection ECU pins No. 9 and 33. Ohmmeter should read 4 ohms.
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.