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Home >> Volvo >> 1993 >> 240 4D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Ignition System >> Timing Control Systems >> Detonation (Knock) Sensor

Detonation (Knock) Sensor

  1. 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.
  2. 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.
  3. 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.
Fig 1: Knock Sensor Connector Terminal ID
G121550Courtesy of VOLVO CARS OF NORTH AMERICA.
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