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Home >> Jeep >> 1997 >> Cherokee Country, 4WD, Part Time >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 4.0L >> No Trouble Code Tests >> Test NTC-9A - Checking Idle Air Control Motor

Test NTC-9A - Checking Idle Air Control Motor

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.
  1. Start engine and allow it to reach normal operating temperature. Using scan tool, set engine speed to 1400 RPM. If engine speed sets at 1300-1500 RPM, return engine to normal idle. Idle speed motor is operating properly. Test passed. If engine speed does not set as specified, use scan tool to return engine to normal idle and go to next step.
  2. Inspect engine for vacuum leaks. Repair vacuum leaks as necessary and perform TEST VER-2A. If no vacuum leaks exist, go to next step.
  3. Turn engine off. Disconnect Idle Air Control (IAC) motor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
  4. Using an external ohmmeter, check resistance between ground and IAC motor connector, driver No. 1 circuit (Violet/Black wire). If resistance is less than 5 ohms, repair driver circuit for short to ground and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
  5. Check resistance between ground and IAC motor connector, driver No. 2 circuit (Brown/White wire). If resistance is less than 5 ohms, repair driver circuit for short to ground and perform TEST VER-2A. If resistance is 5 ohms or, go to next step.
  6. Check resistance between ground and IAC motor connector, driver No. 3 circuit (Yellow/Black wire). If resistance is less than 5 ohms, repair driver circuit for short to ground and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
  7. Check resistance between ground and IAC motor connector, driver No. 4 circuit (Gray/Red wire). If resistance is less than 5 ohms, repair driver circuit for short to ground and perform TEST VER-2A. If resistance is 5 ohms or more go to next step.
    NOTE: Voltage may switch or remain constant in following tests.
  8. Turn ignition on. Using scan tool, select actuator tests. Select stepper motor. Go to next step.
  9. Using scan tool in voltmeter mode, check voltage on IAC motor connector, driver No. 1 circuit (Violet/Black wire). If voltage is more than 10 volts at any time, perform TEST NTC-25B. If voltage is not more than 10 volts at any time, go to next step.
  10. Check voltage on IAC motor connector, driver No. 2 circuit (Brown/White wire). If voltage is more than 10 volts at any time, perform TEST NTC-25C. If voltage is not more than 10 volts at any time, go to next step.
  11. Check voltage on IAC motor connector, driver No. 3 circuit (Yellow/Black wire). If voltage is more than 10 volts at any time, perform TEST NTC-25D. If voltage is not more than 10 volts at any time, go to next step.
  12. Check voltage on IAC motor connector, driver No. 4 circuit (Gray/Red wire). If voltage is more than 10 volts at any time, perform TEST NTC-25E. If voltage is not more than 10 volts at any time, Perform TEST TC-9B.
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