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1999 Ford Escort Idle Air Control Valve

Tiny
IRISH75
  • MEMBER
  • 1999 FORD ESCORT
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 153,000 MILES
I used a diagnostic tool to find out why the service engine soon light was on. It gave me P1506, which says it's a IAC system over speed error. What does this mean? Do I need to adjust the idle or do I need to replace the IAC valve altogether?
Friday, March 6th, 2009 AT 12:45 PM

1 Reply

Tiny
DAVE H
  • MECHANIC
  • 13,383 POSTS
20) DTC P1506

This DTC indicates IAC system has reached over speed malfunction. Possible causes are:
IAC circuit short to ground.
IAC assembly stuck open.
Air intake leaks or restrictions.
Damaged throttle body.
Contaminated or damaged IAC valve assembly.
Faulty Powertrain Control Module (PCM).
Start engine and allow to idle. Inspect air inlet system any of the following possible faults:
Cracked or punctured air inlet tube.
Loose inlet air tube or air cleaner housing.
Loose or damaged throttle body.
Contaminated or damaged IAC valve assembly.
Faulty EGR valve or gasket.
Faulty PCV valve or hose.
Check entire intake air system for vacuum leaks. Repair as necessary.


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Friday, March 6th, 2009 AT 12:54 PM

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