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Home >> BMW >> 1989 >> 750iL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnosis 7-Series V12 >> Component Tests >> Fuel Injector Valves >> Check Pulse Duration

Check Pulse Duration

  1. Pulses can be tested with the multimeter at the injector valve connector. Note that only parallel injection is possible during diagnostic mode. Therefore, when pulse duration is measured with the multimeter (not in diagnostic mode), the pulse duration is doubled for semi-sequential injection.
  2. Test with oscilloscope and universal adapter. Connect terminal frequency OFF (+) to terminal No. 1 (Black) and apply frequency 70 Hz, connect terminal D+ (Blue) to pins No. 16 or 17. The injection signal should be displayed on the oscilloscope. In contrast to pulse duration measurement, injection fade-out when coasting is also displayed.
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