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DTC P0505 - Idle Control System Malfunction

NOTE: For terminal identification, see TERMINAL IDENTIFICATION in SELF-DIAGNOSTICS section. For circuit and wire color identification, see WIRING DIAGRAMS - 2.0L - TURBO article.
  1. Ensure engine coolant temperature is less than 68°F (20°C). Using a stethoscope, listen for operating sound of Idle Air Control (IAC) motor when ignition switch is placed in ON position. If operating sound can be heard, go to next step. If no operating sound can be heard, go to step  4 .
  2. Disconnect IAC motor connector. Turn ignition on. Check voltage between ground and IAC motor connector terminal No. 2, and between ground and terminal No. 5. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between MFI relay and IAC motor connector. Repair as necessary.
  3. Disconnect PCM connector. Turn ignition on. Check voltage between ground and PCM terminals No. 4, 5, 17 and 18. If battery voltage exists, check PCM connector. If PCM connector is okay, replace PCM. If battery voltage does not exist, go to next step.
  4. Check IAC motor connector and wiring harness between PCM and IAC motor connector. If connector and wiring harness are okay, replace IAC motor.
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