1990 Volvo 760 GLE, AW71LFACTORY OEM SERVICE PROCEDURE

Detonation (Knock) Sensor (All Models Except 760 GLE)

  1. Disconnect knock sensor connector. Connect jumper wire across knock sensor terminals. Turn ignition off. Disconnect ignition ECU connector.
  2. On all models except 240 and 240 DL, remove panel under left side of instrument panel. On 240 and 240 DL, ignition ECU is located under panel below glove box.
  3. On all models, push out clip and disconnect ECU connector. Remove cover from ECU connector to expose pin identification numbers. Connect ohmmeter leads between pins No. 12 and No. 13 of ignition ECU connector. See Figure . Ohmmeter should indicate continuity.
  4. 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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