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General >> Troubleshooting

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ScoobyRacing03
Hard-core CEG'er

Reged: 07/29/00
Posts: 3465
Loc: Montgomery, IL
got a CEL
#225 - 08/16/02 05:13 AM

P1506 Idle Air Control Over Speed Error.
I posted in this thread about it:
click here

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2003 Subaru WRX some mods

Even if you don't have the answer, you certainly have to admire the problem.

aka ZetecRacing

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GeoPappas
Veteran CEG'er

Reged: 12/13/01
Posts: 667
Loc: Northern VA
Re: got a CEL new
#1007 (Re: ScoobyRacing03) 08/16/02 10:58 PM

From the Ford TSP (Technical Service Publication):

In reply to:


Diagnostic Trouble Code (DTC) P1506 indicates Self-Test has detected an IAC overspeed error.

Possible causes:
-- IAC circuit short to GND.
-- IAC assembly stuck open.
-- Vacuum leak.
-- Damaged IAC assembly.
-- Damaged throttle body.
-- Damaged PCM.

* Key on, engine running.
* With the engine at idle, listen for vacuum leaks.
* Inspect the entire inlet air system from the Mass Air Flow (MAF) sensor to the intake manifold for damage or leaks such as:
* Cracked or punctured inlet air tube.
* Loose inlet air tube at the air cleaner housing or throttle body.
* IAC valve assembly or gasket seal.
* Intake manifold assembly or gasket seal.
* EGR valve gasket seal.
* Vacuum supply connectors and hose.
* PCV valve, connectors and hose.





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96 Contour SE
Duratec V6 24-valve 2.5L ATX
108,000 mi.
Replaced: crankshaft w/ DMD, EGR valve (clogged), EVR, DPFE, PCV valve, evap emissions hose & tube (cracked), window regulator (broken), LH & RH PCV tubes, UIM gasket (leak), ignition coil


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