Test NTC-9A - Checking Idle Air Control Motor
WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. 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 DIAGRAMS
section at the end of this article.
- Using scan tool, set engine speed to 1100 RPM. If engine speed set at 1050-1150 RPM, idle speed motor is operating properly. Test is complete. If engine speed did not set at 1050-1150 RPM, return engine to normal idle speed. Disconnect idle air control motor connector.
- Using scan tool in voltmeter mode, check voltage on idle air control motor connector, driver No. 1 circuit (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.
- Using scan tool, check voltage on idle air control motor connector, driver No. 2 circuit (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.
- Using scan tool, check voltage on idle air control motor connector, driver No. 3 circuit (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.
- Using scan tool, check voltage on idle air control motor connector, driver No. 4 circuit (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.
- Check engine for vacuum leaks. Repair as required. Perform TEST VER-2. If no vacuum leaks are observed, replace idle air control motor. Perform TEST VER-2.