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Home >> Jeep >> 1996 >> Grand Cherokee Limited, 5.2 Y >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Controls - Tests W/Codes - 3.5L) >> Self-Diagnostic Tests >> Test NTC-8A - Checking Idle Air Control Motor

Test NTC-8A - Checking Idle Air Control Motor

WARNING: This page is about a different car, the 1994 Eagle Vision, 1994 Dodge Intrepid, 1994 Chrysler New Yorker, 1994 Chrysler LHS, and 1994 Chrysler Concorde. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION DIRECTORY TABLE  . For wiring diagram, see WIRING DIAGRAMS  section. After each repair, perform TEST VER-2  .
  1. Using DRB, 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 does not set at 1050-1150 RPM, go to next step.
  2. Return engine to normal idle speed. Disconnect Idle Air Control (IAC) motor connector. Using DRB in voltmeter mode, check voltage on IAC motor connector terminal No. 1 (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.
  3. Using DRB, check voltage on IAC motor connector terminal No. 2 (Yellow/Black wire). If voltage is less than one volt, go to TEST NTC-8B  . If voltage is more than one volt, go to next step.
  4. Using DRB, check voltage on IAC motor connector terminal No. 3 (Brown/White wire). If voltage is less than one volt, go to TEST NTC-8B  . If voltage is more than one volt, go to next step.
  5. Using DRB, check voltage on IAC motor connector terminal No. 4 (Violet/Black wire). If voltage is less than one volt, go to TEST NTC-8B  . If voltage is more than one volt, go to next step.
  6. Check engine for vacuum leaks. Repair as required. If no vacuum leaks are observed, remove IAC motor. Using DRB, actuate IAC motor. If IAC motor tip does not extend and retract, replace IAC motor. If IAC motor tip extends and retracts, test is complete.
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