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P0505 - Idle Control System Malfunctionhttp://engine-codes.com/p0505.htmlForum CodePossible causes- IACV-AAC valve harness is open or shorted - IACV-AAC valve poor electrical connection - Faulty IACV-AAC valve
CODES PO505 IDLE AIR CONTROL MOTOR CIRCUIT. P2781 AND PO1757 DID NOT SEE THEM IN CODE MANUAL.CODE PO505 WHAT ITS TELLING YOU.THAT YOUR STEPPER MOTOR COIL CIRCUIT IS SHORTED TO SYSTEM POWER B+ OR STEPPER MOTOR COIL NUMBER 1 2 3 4 CIRCUIT OPEN OR SHORTED TO GROUND.
http://engine-codes.com/p0505.htmlForum CodePossible causes- IACV-AAC valve harness is open or shorted 
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