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.
1990 Volvo 760 GLE, AW71FACTORY OEM SERVICE PROCEDURE
Detonation (Knock) Sensor (760 GLE)
- Disconnect fuel distribution pipe connector. Connect a jumper wire across terminals No. 1 and No. 2 on both knock sensors. See Fig 1 .
- Turn ignition switch to OFF position. Disconnect ignition ECU connector. Remove panel under left side of instrument panel to gain access to ECU. Push out clip and disconnect ECU connector.
- Remove cover from ECU connector to expose pin identification numbers. Connect ohmmeter leads between ECU connector pins No. 12 (Black wire) and No. 13 (Gray wire), and then between pins No. 24 (Brown wire) and No. 25 (Green wire). See Figure . Ohmmeter should indicate continuity.
- 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.
Factory Service Tools
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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.
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