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Idle Speed Control (ISC) Motor Operation Test: Diamante

  1. Remove throttle body. See N - REMOVE/INSTALL/OHAUL article. Remove stepper motor from throttle body. Connect Test Harness (MD998463 ) to stepper harness.
  2. Hold stepper motor in hand and place thumb on top of plunger. Connect positive side of 6 volt power source to White and Green clips of test harness. One by one, connect negative side of power source to Red and Black clips, Blue and Black clips, Blue and Yellow clips, Red and Yellow clips, and Red and Black clips again.
  3. Reverse connection sequence, starting with the last Red and Black clips. Stepper motor should vibrate with each connection. Replace stepper motor if vibration is not felt with each connection.
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