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DTC P0505: IDLE AIR CONTROL (IAC) SYSTEM MALFUNCTION Suzuki Esteem I

Testing & Diagnostics ~174 words
  1. Check operation of IDLE AIR CONTROL VALVE. If not using scan tool, go to «IDLE CONTROL SYSTEM»(ref-91187-S03388783922002110600000) in SYSTEM & COMPONENT TESTING article. If using scan tool, go to next step.
  2. Turn ignition off. Connect scan tool to Data Link Connector (DLC). Start and warm engine to operating temperature. Select MISC TEST on scan tool and command RPM to increase and decrease. If IAC valve operates as specified, problem is intermittent or due to a faulty PCM. Go to INTERMITTENTS in «TROUBLE SHOOTING - NO CODES»(ref-91186) article. If IAC valve does not operate as specified, go to next step.
  3. Turn ignition off. Disconnect IAC valve harness connector and check for poor connection. Disconnect PCM 22-pin harness connector "C" and check connection at terminal No. 2. If connections are okay, check wires from IAC valve to PCM, main relay and ground for an open or short circuit. See «WIRING DIAGRAMS»(ref-5394) article. Repair as necessary and retest system. If wiring is okay, replace IAC valve and retest system.

More articles — Engine Controls - Self-Diagnostics