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 - SYSTEM/COMPONENT TESTSIGNITION SYSTEMTIMING CONTROL SYSTEMSDETONATION (KNOCK) SENSORS (960)
1992 Volvo 240 Base, 4D Sedan, Automatic, AW70L
Detonation (Knock) Sensors (960)
1992 Volvo 240 Base, 4D Sedan, Automatic, AW70LSECTION Detonation (Knock) Sensors (960)
- Turn ignition off and remove fuse No. 24. Connect Measuring Unit (999 3070) between ECU and ECU connector. See Figure . Turn ignition on.
- Depending upon which knock sensor is being checked, disconnect front or rear knock sensor connector and connect a jumper wire between knock sensor connector terminals.
- Connect an ohmmeter between measuring unit terminals No. 2 and terminal No. 11 or 29 (depending on which sensor is being checked). Reading should be zero ohms. If reading is correct, replace knock sensor. Tighten knock sensor to 15 ft. lbs. (20 N.m).
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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.