DTC P1507: Idle Air Control (IAC) UNDERSPEED Error

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P1507 - IDLE AIR CONTROL (IAC) UNDERSPEED ERROR

Description:	This DTC is set when the powertrain control module (PCM) detects an engine idle speed that is less than the desired RPM.
Possible Causes:	IAC circuit open Air inlet is plugged Damaged or incorrect IAC valve IAC valve stuck closed VPWR to IAC solenoid open IAC circuit short to voltage
Diagnostic Aids:	Disconnect the IAC valve and look for little or no change in engine RPM as an indication of a stuck or damaged valve.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	GO to Pinpoint Test KE .