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Home >> International >> 1980 >> Scout II 2D Pickup, 5.7L Eng, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Ignition System >> PRESTOLITE Electronic BREAKERLESS Ignition >> Testing >> Electronic Control Unit Operation Check

Electronic Control Unit Operation Check

  1. Connect voltmeter positive lead to brown wire at coil negative terminal. Connect voltmeter negative lead to ground. See Fig 1.
    Fig 1: Checking Electronic Control Unit Operation
    G09336934Courtesy of NOT AVAILABLE
  2. Turn ignition switch "ON". Place the blade of a small screwdriver against face of sensor while observing voltmeter. Voltage should increase to 12-13 volts. When screwdriver is removed, voltage should drop to 5-8 volts.
  3. If voltage does not switch up and down when screwdriver is against sensor and then removed, electronic control unit is inoperative and must be replaced.
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