Según el manual de diagnosis :
P0505 - Loss of idle speed control :
Loss of idle speed control will result if the idle RPM is +-200 from present idle speed and IAC motor is at zero or maximum for greater than 5 seconds.
- Loss of idle speed control doesn't necessarily mean that the IAC is bad. There are other causes such as intake leaks, misfiring cylinder.
- Leaking injectors can cause poor idle. To check for leaky injectors remove A/C. Then with throttle wide open, turn key to ON for 2 seconds and then off for 2 seconds five consecutive times. Replace injectors if there is any evidence of raw fuel in the bores.
- Vacuum leaks - check for leaks
- Contaminated fuel
- Excessive Oil in crankcase
- TP sensor reading greater than 1 % (cable misadjusted), battery less then 9 Volts, or vehicle speed sensor (VSS) greater than 0 will disable idle speed control.
- Loss of battery power to terminal 31 of ECM.
Osea :
Tienes una perdida de control en la velocidad del relantí, que se ha incrementado o disminuido en algun momento en 200 rpm más de lo establecido, puede ser por una de esas múltiples causas descritas



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