Mitsubishi 3000GT Service Manual page 261

MULTIPORT On-Vehicle Inspection of MFI
FUEL INJECTION - Components
(5) With the idle air control motor as shown in the illustration,
connect the negative (-) terminal of the power supply
to each clip as described in the following steps,
whether or not a vibrating feeling (a feeling of very slight
vibration of the stepper motor) is generated as a result
of the activation of the stepper motor.
1) Connect the negative (-) terminal of the power supply
to the red and black clip.
2) Connect the negative (-) terminal of the power supply
to the blue and black clip.
3) Connect the negative (-) terminal of the power supply
to the blue and yellow clip.
4) Connect the negative (-) terminal of the power supply
to the red and yellow clip.
5) Connect the negative (-) terminal of the power supply
to the red and black clip.
6) Repeat the tests in sequence from (5) to (1).
(6) If, as a result of these tests, vibration is detected, the
stepper motor can be considered to be normal.
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