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Idle Speed Stabilization (Automatic Transmission)

  1. Set parking brake. Run engine at idle and warm up to operating temperature. Engine should idle between 570-670 RPM. If okay, test is finished. If not okay, go to step 2).
  2. Using volt/ohmmeter, test input at ECU (terminal No. 16 to battery positive). Place shift lever in position "P" or "N", reading should be approximately 12 volts. With shift lever in "D", voltage should drop. If no on either test, repair short in circuit. If okay, test is finished.
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