1992 Jeep Cherokee LimitedFACTORY OEM SERVICE PROCEDURE

Automatic Idle Speed (AIS) Motor

  1. Set parking brake and block drive wheels. Route all Exerciser Tester (7558) cables away from cooling fans, drive belt, pulleys, and exhaust components. Adjust engine idle speed to normal before disconnecting exerciser.
  2. With ignition off, disconnect AIS motor connector at throttle body. Plug in exerciser tester harness connector into AIS motor. Connect Red clip of exerciser to battery positive terminal.
  3. Connect Black clip to battery negative terminal. Red light on exerciser will flash if exerciser is properly connected. Start engine. Move exerciser switch to HIGH position. Engine speed should increase. Move switch to LOW position. Engine speed should decrease.
  4. If engine idle speed changes while using exerciser, AIS motor is working properly. Return engine speed to normal idle and disconnect exerciser from idle speed stepper motor.
  5. If engine idle did not change, turn ignition off. DO NOT  disconnect exerciser from stepper motor. Remove AIS motor from throttle body. With ignition off, cycle the exerciser switch between HIGH and LOW positions. Pintle should move in and out of motor.
    CAUTION: When checking AIS motor operation with motor removed from throttle body, DO NOT  extend pintle more than 1/4" (6.35 mm), as pintle may separate from motor. The AIS motor must be replaced if pintle separates from motor.
  6. If pintle still does not move, replace AIS motor. Start engine and test replacement motor. If pintle now operates properly, check AIS motor bore in throttle body and clean if necessary. Reinstall AIS motor and retest.
  7. If throttle body is clear of obstructions, use Chrysler's Diagnostic Readout Box II (DRB-II) tester and appropriate AIS (idle speed stepper) motor tests in the TESTS W/CODES article.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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