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P1506 Diagnostic Trouble Code Discussion for March 2011

Idle Air Control System RPM Higher Than Expected

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Trouble Ticket Help Requests for DTC P1506
Help Request Posted
1997 Mazda 626 DX 2.0L Surge, MIL Lamp on VIN: 1YVGE22C8V
P1506: Idle Air Control System RPM Higher Than Expected. Idle is too high & surges after warm up & idle control seems ineffective or shut down during warm up with P-1506 MIL, which returns almost immediately after being cleared. In park, no accessories on the idle will change consistently but randomly from 9...
March 02, 2011
1997 Ford Explorer XLT 4.0L Poor Idle Quality, Surge, MIL Lamp on VIN: 1FMDU32E0V
P1506: Idle Air Control overspeed error. Engine idles at ~1400 RPM. Desired RPM is ~665. Commanded IAC to 0% - ~50 RPM change IAC command stays at 28.13% at idle - won't go lower TPS 1.15 volts - can not find spec in Mitchell I found a TPS chart: 0 degree .65 volts 10 degrees .97 volts and so on.. O...
March 19, 2011