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 MANUALSVOLVO1993960 4D WAGON, AW30-43REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODESFAULT CODE TESTINGCODE 3-2-2 (AIRFLOW METER HOT WIRE)
1993 Volvo 960 4D Wagon, AW30-43
Code 3-2-2 (Airflow Meter Hot Wire)
1993 Volvo 960 4D Wagon, AW30-43SECTION Code 3-2-2 (Airflow Meter Hot Wire)
- Approximately 4 volts is routed to platinum wire in airflow meter from ECU terminal No. 5. Ground is supplied from ECU terminal No. 7. Fault code is set if voltage between ground and terminal No. 7 does not exceed 2.5 volts.
- Turn ignition off. Connect Measuring Unit (999-3070 ) to ECU. See CONNECTING MEASURING UNIT TO ECU . To ensure airflow meter is grounded, connect ohmmeter between measuring unit terminals No. 19 and 26. Zero ohms should be present. Connect ohmmeter between airflow meter connector terminal No. 1 (Brown wire) and ground. Reading should be about zero ohms.
- Connect ohmmeter between measuring unit terminals No. 7 and 26. Reading should be about 2.5-4.0 ohms. If resistance is not to specification, measure resistance between airflow meter terminals No. 2 (Brown/White wire) and No. 3 (Green/Yellow wire).
- Turn ignition on. Connect voltmeter between measuring unit terminals No. 7 and 19. About 1.4 volts should be present. Start engine. Voltage should increase to 2.3-2.6 volts when idling. Voltage should be 2.3 volts with engine hot.
- If voltage reading is too low, connect voltmeter between measuring unit terminals No. 25 and 19. Increase speed to 1800 RPM, and stop engine. Voltage should be about 4 volts. On A/T models, check test mode No. 1 if load signal fault code is displayed. See TEST MODE NO. 1 under RETRIEVING CODES.
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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.