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Home >> Volvo >> 1987 >> 780 AW71 >> Repair and Diagnosis >> Engine Performance >> System >> BOSCH LH-JETRONIC - Engine Control System >> Diagnosis & Testing >> Circuit Checks >> Knock Sensor B230F/FT
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Knock Sensor B230F/FT

  1. Disconnect wiring harness from knock sensor. Connect jumper wire between pins at rear of connector. Be careful not to damage pins.
  2. Measure resistance between control unit connector pins No. 12 and 13. Resistance should be zero ohms. If correct, remove jumper wire. Meter should indicate infinity. If neither reading is correct, check for shorted or broken wires.
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