Detonation (or 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 the "OFF" position. Disconnect ignition ECU connector. Remove panel under left side of instrument panel to gain access to ECU. Push out catch and disconnect ECU connector.
- Remove cover from ECU connector to expose pin identification numbers. Using an ohmmeter, connect ohmmeter leads between ECU connector pin No. 12 (Black wire) and No. 13 (Gray wire), and then between pin No. 24 (Brown) and No. 25 (Green). 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.
Courtesy of VOLVO CARS OF NORTH AMERICA.