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Improper Idle Speed When A/C Is Operating

WARNING: This page is about a different car, the 2002 Dodge Stratus and 2002 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure ignition is off. Check for poor connections or faulty terminals at Engine Control Module (ECM) connector C-109 (M/T) or Powertrain Control Module (PCM) connector C-114 (A/T). ECM/PCM is located on passenger's side of vehicle. See Figure . Repair faulty connections as necessary. Recheck for improper idle speed condition. If connections are okay, go to next step.
  2. Disconnect ECM connector C-109 or PCM connector C-114. See Figure or Figure . Start engine and allow to idle. Turn A/C switch on. Using DVOM, measure voltage between ground, and ECM connector C-109 terminal No. 24 (Blue/White wire) or PCM connector C-114 terminal No. 61 (Blue/White wire). If ambient (outside) temperature is less than 59°F (15°C), voltage should be one volt or less. If ambient temperature is greater than 65.4°F (18°C), battery voltage should be indicated. If voltage is as specified for current ambient temperature, replace ECM/PCM. See REMOVAL, OVERHAUL & INSTALLATION - SEBRING COUPE & STRATUS COUPE article. If voltage is not as specified for current ambient temperature, diagnose A/C system. See appropriate article in AIR CONDITIONING & HEATING.
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