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Using Lab Scope

NOTE: Manufacturer recommends connecting Test Connector (MB991709) to IAC motor during testing procedure.
  1. Connect lab scope pick-up at IAC motor connector or Engine Control Module/Powertrain Control Module (ECM/PCM) connector. If connecting lab scope pick-up at IAC motor connector, connect pick-up lead to IAC motor connector terminals No. 1, 3, 4 and 6 by backprobing. See Figure .
  2. If connecting lab scope pick-up at ECM (M/T) or PCM (A/T), connect pick-up lead to ECM connector C-111 or PCM connector C-112 terminals No. 14 (Green/Black wire), No. 15 (Green/White wire), No. 28 (Green/Red wire) and No. 29 (Black/Yellow wire) by backprobing. See Figure or Figure .
  3. Start engine and bring to operating temperature. Let engine idle and turn A/C switch on. Compare waveform to normal pattern. See Fig 1 . Waveform should be stable with engine idling. If point "A" is extremely small or does not appear, IAC motor is defective. If point "B" is extremely small or does not appear, IAC motor coil is shorted. In both cases, IAC motor will need to be replaced. See REMOVAL, OVERHAUL & INSTALLATION - CARS article. If waveform is extremely erratic, problems in circuits between IAC motor and ECM/PCM exist.
Fig 1: Identifying Normal IAC Motor Waveform
G00005852Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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