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DTC 138 - Target Idle Not Reached

NOTE: For component terminal identification, see TERMINAL IDENTIFICATION  in this article. For wiring diagrams, see WIRING DIAGRAMS  section.
  1. Using scan tool, perform SENSOR READ TEST No. 12 (idle air control position). If Idle Air Control (IAC) motor step value increases when A/C switch is turned on, perform throttle body minimum airflow check and go to step 3). If IAC motor step value does not increase, go to next step.
  2. Disconnect IAC motor connector. Check resistance between IAC motor terminals No. 1 and 4 and between No. 2 and 3. If resistance is not 38-52 ohms at 68°F (20°C), replace IAC motor. If resistance is as specified, check IAC motor control circuit. See DTC 25 - IDLE AIR CONTROL (IAC) MOTOR CIRCUIT  .
  3. Start and warm engine until engine coolant temperature is 176°F (80°C) or more. Turn engine off. Disconnect PCV valve hose from intake manifold. Connect Air Metering Fitting (MB995050) to intake manifold. Disconnect 3/16" idle purge line from throttle body. Cap throttle body nipple.
  4. Start engine and idle for at least 60 seconds with all accessories off. Using scan tool, access SENSOR READ TEST "MINIMUM AIRFLOW IDLE SPEED" screen. After test selection, IAC motor will close, idle air spark advance will be fixed and scan tool will display engine speed. Idle speed should be 600-1200 RPM.
  5. If idle speed is above specification, check IAC motor operation with scan tool. If IAC motor is okay, replace throttle body. If idle speed is below specification, remove and clean throttle body. Reinstall throttle body and repeat minimum airflow check.
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