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OBD2 scan code P1504 idle speed control inputs

Tiny
KATBILLCO
  • MEMBER
  • 2002 MERCURY SABLE
  • 125,000 MILES
The scanner showed p1504 when testing, reading man. Cont. Spd. Idle speed control auxilary inputs. Replaced the isc but still reads the same. How does a person check the inputs? Need help figuring this out. Hope you can help. Bill
Wednesday, June 12th, 2013 AT 9:53 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check your air duct for holes as well as all grommets on engine, air leaks can cause this. The duct work is between the maf and throttle body for holes. Also check if It 's installed correctly.
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Wednesday, June 12th, 2013 AT 11:03 AM
Tiny
KATBILLCO
  • MEMBER
  • 2 POSTS
I checked the area described with a fine tooth comb, and can not find a hole or crack. I sprayed carb cleaner around the area with motor running to see if it would affect the idle, and it did not. The funny thing about this is the motor runs great and idles very good, with just a very slight change while idling about 7 seconds apart sometimes. Very slight. Would not know there was a problem if the check engine light did not com on. I also changed the tps sensor when I changed the isc. Don't think its drawing air there but can't say for sure. No variance. In idle when spraying the carb cleaner around it. Thanks, Bill
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Thursday, June 13th, 2013 AT 3:40 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check your grommets on valve covers as well and then you'll have to have a pro check it with their scanner
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Thursday, June 13th, 2013 AT 3:42 PM

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