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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSVOLVO1993940 TURBO, 4D SEDAN, AW71REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSIGNITION SYSTEMTIMING CONTROL SYSTEMSDETONATION (KNOCK) SENSOR
1993 Volvo 940 Turbo, 4D Sedan, AW71
Detonation (Knock) Sensor
1993 Volvo 940 Turbo, 4D Sedan, AW71SECTION Detonation (Knock) Sensor
- Disconnect knock sensor connector. Connect jumper wire between knock sensor terminals No. 1 and 2. See Fig 1 . Turn ignition off. Disconnect ignition ECU connector.
- Remove cover from ECU connector to expose terminal identification numbers. Connect ohmmeter leads between terminals No. 12 and 13 of ignition ECU connector. See Figure . Ohmmeter should indicate zero ohms.
- If ohmmeter resistance is high (infinity), one or both wires may be shorted. Remove jumper wire, and take reading with ohmmeter on each wire. Replace damaged wires as required. If wires are not damaged, replace knock sensor.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.