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 MANUALSVOLVO1992240 BASE, 4D SEDAN, AUTOMATIC, AW70LREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODESSELF-DIAGNOSTICS - TURBO SYSTEMFAULT CODE TESTINGCODE 3-4-2 (A/C BLOCKING RELAY)
1992 Volvo 240 Base, 4D Sedan, Automatic, AW70L
Code 3-4-2 (A/C Blocking Relay)
1992 Volvo 240 Base, 4D Sedan, Automatic, AW70LSECTION Code 3-4-2 (A/C Blocking Relay)
- Remove turbo control unit connector. Turn ignition on. Connect voltmeter between turbo control unit terminal No. 6 and ground. Reading should be 12 volts. Turn ignition off. Install control unit connector.
- Start engine, and turn A/C on. After A/C compressor has engaged, quickly press accelerator pedal to floor. Compressor should disengage when throttle is fully opened. Turn ignition off.
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.