Need help with wiring layout
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Junior User
Joined: Dec 2001
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From: Moscow PA
Need help with wiring layout
I Keep getting the trouble code P1506. According tto the OBDII list on this site, the IAC is bad or the IAC circuit is going to ground. Replaced the IAC and made no difference. Now need to know the pin numbers at the computer to check the wiring. It's a 1998 2 WD 2.5 cyl four banger with A/C. Any help would be greatly appreciated. Thank you.
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IAC Control
Ford Says;
P1506 - Idle Air Control (IAC) Overspeed Error
This DTC is set when the PCM detects engine idle speed that is greater than the desired rpm.
Possible troubles
IAC circuit short to GND
Damaged IAC valve
IAC valve stuck open
Vacuum leaks
Failed EVAP system
Damaged PCM
Test
Disconnect IAC valve and look for little or no change in engine rpm as an indication of a stuck or damaged valve.
PCM (2.5L) Pin 83 White/Light Blue
Other side of IAC goes to red +12vdc.
Dave
P1506 - Idle Air Control (IAC) Overspeed Error
This DTC is set when the PCM detects engine idle speed that is greater than the desired rpm.
Possible troubles
IAC circuit short to GND
Damaged IAC valve
IAC valve stuck open
Vacuum leaks
Failed EVAP system
Damaged PCM
Test
Disconnect IAC valve and look for little or no change in engine rpm as an indication of a stuck or damaged valve.
PCM (2.5L) Pin 83 White/Light Blue
Other side of IAC goes to red +12vdc.
Dave
Last edited by Dave257; Feb 8, 2004 at 05:30 PM.
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