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Home >> Mitsubishi >> 1990 >> Montero LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> Ignition Coil & Power Transistor >> Inspection Using Oscilloscope

Inspection Using Oscilloscope

  1. Primary Signal Of Ignition Coil -  Run engine at idle speed. Connect the probe to oscilloscope pick-up point No. 1 as shown in circuit diagram. See Figure . Primary signal should be as illustrated. See Fig 1 .
    Fig 1: Primary Signal Waveform
    G00358367Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  2. Control Signal Of Power Transistor -  Connect the probe to oscilloscope pick-up point No. 2 as shown in circuit diagram. See Figure . Power transistor control signal should be as illustrated. See Fig 2 .
    Fig 2: Power Transistor Control Signal Waveform
    G00358368Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.