Test NTC-8A - Checking Idle Air Control Motor
WARNING: This page is about a different car, the 1994 Plymouth Sundance, 1994 Plymouth Acclaim, 1994 Dodge Spirit, 1994 Dodge Shadow, and 1994 Chrysler LeBaron. 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 DIRECTORY
. For wiring diagrams, see WIRING DIAGRAMS
.
- Using DRB, set engine speed to 1100 RPM. If engine speed sets at 1050-1150 RPM, Idle Air Control (IAC) motor is operating properly. Test is complete. If engine speed does not set at 1050-1150 RPM, return engine to normal idle speed. Disconnect IAC motor connector.
- Put DRB in voltmeter mode. Using DRB, 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-8B. If voltage is more than one volt, go to next step.
- Using DRB, 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-8B. If voltage is more than one volt, go to next step.
- Using DRB, 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-8B. If voltage is more than one volt, go to next step.
- Using DRB, 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-8B. If voltage is more than one volt, go to next step.
- Check engine for vacuum leaks. Repair as required. Perform TEST VER-2 . If no vacuum leaks are observed, remove IAC motor. Ensure IAC motor electrical connector is connected. Using DRB, actuate IAC motor. If IAC motor pintle does not extend and retract, replace IAC motor. Perform TEST VER-2. If IAC motor pintle extends and retracts, reinstall IAC motor. System is functioning okay. Test is complete.