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 MANUALSVOLVO1987240 GL, 4D SEDAN, AUTOMATIC, AW70REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISBOSCH LH-JETRONIC - ENGINE CONTROL SYSTEMDIAGNOSIS & TESTINGCIRCUIT CHECKSKNOCK SENSOR B230F/FT
1987 Volvo 240 GL, 4D Sedan, Automatic, AW70
Knock Sensor B230F/FT
1987 Volvo 240 GL, 4D Sedan, Automatic, AW70SECTION Knock Sensor B230F/FT
- Disconnect wiring harness from knock sensor. Connect jumper wire between pins at rear of connector. Be careful not to damage pins.
- Measure resistance between control unit connector pins No. 12 and 13. Resistance should be zero ohms. If correct, remove jumper wire. Meter should indicate infinity. If neither reading is correct, check for shorted or broken wires.
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.