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make sure the air and vacuum pipe work is in good condition and fitted properly and not popping off, follow this link ,wait till near the end as the mechanic shows a pipe that has a history of being a problem with coming loose ,might just help you 2001 KIA RIO IAC Idle Air Control Valve Testing and Cleaning
Possible causes for P1505 & p1507
Faulty Idle Speed Control Actuator valve, harness is open or shorted, Idle Speed Control Actuator valve circuit poor electrical connection. No the codes are not related to the EGR. P0198 is related to the engine oil temperature sensor. By the way you should use a meter as supposed to a test light. The test light will not be able to measure 5 volts reference or voltage drops. However I would try replacing the affected parts based on the codes and the info you've provided. Good luck.
sorry but their are no diadnostic codes with this number in the manufacturers codes i have
P0505....Idle Control System
P0507....Idle Control System RPM Higher Than Expected
but i have found these generic codes for you if they help
P1505 - Idle-Speed Control Valve Closing Solenoid Control Circuit Electrical
P1507 - Idle-Speed Control Valve Opening Solenoid Control Circuit Signal Low
The knock sensor will cause the ignition timing to ******, which
will cause a lack of power, however, it's important that the engine camshaft/crankshaft timing was set properly when rebuilding the engine,
if this is off, the engine will have no power and you could set the
knock sensor code.
ZERO out your ECM (wipe out all 'adaptives'). disconnect both battery post connectors and tough them together for 30 seconds. Afterward, reconnect them to the battery... see what happens
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