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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 >> Throttle Switch B280F
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Throttle Switch B280F

  1. Connect ohmmeter leads between ground and control unit connector pin No. 7. Resistance should be 0 ohms. Slowly depress accelerator to open throttle switch and observe meter reading. Resistance should increase.
  2. If reading is incorrect, measure resistance at throttle switch to determine if wire is broken (open circuit), or if throttle switch is defective. Adjust or replace as necessary.