P0505 is an idling control problem and the most ikely fault is a bad IAC. However it should be noted that a shorted IAC can result in the PCM being damaged as well.
DTC P0505- IDLE CONTROL SYSTEM MALFUNCTION
1. Start engine and run at 3000 RPM with no loads and transmission in Park or Neutral until radiator fan comes on. Allow engine to idle. On Canadian models, set parking brake and ensure headlights are off. Using OBD-II scan tool, check engine speed with no loads (headlights, blower motor, rear defogger, radiator cooling fan and A/C off). If engine speed is not within specification, go to next step. If engine speed is within specification, problem is intermittent. System is okay at this time.
2. If engine speed is 550 RPM or less, go to next step. If engine speed is not 550 RPM or less, disconnect IAC valve connector. On A/T equipped vehicles and D16Y7 engine, if engine speed does not increase, replace IAC valve. On A/T equipped vehicles and D16Y7 engine, if engine speed increases, adjust base idle speed to specification. On D16Y5 and D16Y8 engines with M/T, if engine speed does not decrease or engine does not stall, replace IAC valve. On D16Y5 and D16Y8 engines with M/T, if engine speed decreases or engine stalls, adjust base
idle speed to specification. On all models, if idle speed will not adjust to specification, clean throttle body ports. If idle speed still will not adjust, replace IAC valve.
3. Remove air intake duct from throttle body. Place a finger on upper port in throttle body. If engine speed does not decrease, check for vacuum leaks and ensure throttle valve is completely closed. Repair as necessary. If idle speed decreases, adjust base idle speed to specification. If idle speed will not adjust to specification, replace IAC valve. I
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Monday, August 22nd, 2011 AT 8:07 PM
