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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 24 (Engine Controls - Tests W/Codes - 2.5L) >> Self-Diagnostic Tests >> Test NTC-9A - Checking Idle Air Control Motor

Test NTC-9A - Checking Idle Air Control Motor

WARNING: This page is about a different car, the 1995 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagrams, see WIRING DIAGRAM  section.
  1. Using scan tool, set engine speed to 1100 RPM. If engine speed sets at 1050-1150 RPM, idle speed motor is operating properly. Test is complete. If engine speed does not set at 1050-1150 RPM, return engine to normal idle speed. Disconnect Idle Air Control (IAC) motor connector.
  2. Put scan tool in voltmeter mode. Using scan tool, check voltage on IAC motor connector Brown/White wire while momentarily opening and closing throttle. If voltage is less than one volt, go to TEST NTC-9B. If voltage is more than one volt, go to next step.
  3. Using scan tool, check voltage on IAC motor connector Yellow/Black wire while momentarily opening and closing throttle. If voltage is less than one volt, go to TEST NTC-9B. If voltage is more than one volt, go to next step.
  4. Using scan tool, check voltage on IAC motor connector Gray/Red wire while momentarily opening and closing throttle. If voltage is less than one volt, go to TEST NTC-9B. If voltage is more than one volt, go to next step.
  5. Using scan tool, check voltage on IAC motor connector Violet/Black wire while momentarily opening and closing throttle. If voltage is less than one volt, go to TEST NTC-9B. If voltage is more than one volt, go to next step.
  6. Check engine for vacuum leaks. Repair as required. Perform TEST VER-2. If no vacuum leaks are observed, replace IAC motor. Perform TEST VER-2.
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