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Home >> Subaru >> 2001 >> Outback Base, Automatic >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics - 2.2L & 2.5L >> Diagnostic Tests >> DTC P0505: Idle Control System Low Input - IMPREZA 2.2L, Legacy & Outback 2.5L M/T & Outback Sport

DTC P0505: Idle Control System Low Input - IMPREZA 2.2L, Legacy & Outback 2.5L M/T & Outback Sport

  1. Perform basic diagnostic procedure. See BASIC DIAGNOSTIC PROCEDURE . Turn ignition on. Using DVOM connected to ground, backprobe ECM connector B134 (35-pin connector) terminal No. 5. See Figure. If voltage is more than 3 volts, repair poor terminal contact in ECM connector. If voltage is not more than 3 volts, go to next step.
  2. Turn ignition off. Disconnect IAC solenoid valve connector. Turn ignition on. Measure voltage between ground and IAC solenoid valve connector terminal No. 2. See Figure. If voltage is more than 10 volts, go to next step. If voltage is not more than 10 volts, locate and repair open circuit in wiring and check for poor terminal contact in connectors between IAC solenoid valve and main relay. See WIRING DIAGRAMS article.
  3. Turn ignition off. Disconnect ECM connector B134 (35-pin connector). Measure resistance between IAC solenoid connector terminal No. 1 and ECM connector B134 (35-pin connector) terminal No. 5. If resistance is less than one ohm, go to next step. If resistance is not less than one ohm, locate and repair open circuit in wiring and check for poor terminal contact in connectors between ECM and IAC solenoid valve.
  4. With ECM connector B134 (35-pin connector) disconnected, measure resistance between ground and ECM connector B134 (35-pin connector) terminal No. 5. If resistance is less than 10 ohms, locate and repair short to ground in wiring between ECM and IAC solenoid valve. If resistance is not less than 10 ohms, go to next step.
  5. Measure resistance between ground and IAC solenoid valve connector terminal No. 3. If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, locate and repair open circuit in wiring between ground and IAC solenoid valve.
  6. Check for poor contact in ECM and IAC solenoid valve connectors. Repair connectors as necessary. If connectors are okay, replace IAC solenoid valve. Clear memory and perform verification procedure. See CLEARING DIAGNOSTIC TROUBLE CODES  and VERIFICATION PROCEDURE  .
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