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1999 Volkswagen Passat 99 Passat

Tiny
LUCI080391
  • MEMBER
  • 1999 VOLKSWAGEN PASSAT
  • 153,000 MILES
Code reading p112 short circuit low input already replaced iat sensor temp reading high of 286 no visible signs of a short circuit. Anything I should look at specifically? Iat intake air temp reading too high and when I go to reset the code it still detects high temp. Enging light comes bk on within 10 minutes. This is driving me nuts reaaly need the help. Thanx
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Wednesday, July 17th, 2013 AT 7:34 AM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,752 POSTS
A sensor can't cause that code unless you physically do something to short it between the two terminals. The only thing that can cause this is the signal wire to the sensor is grounded. You can verify that by unplugging it and measuring the resistance to ground on the signal wire.

The ground wire may read very low resistance or it may not, depending on how the Engine Computer works, but the signal wire must read a very high resistance or an open circuit. If you find low resistance, follow the wire harness to where it may have rubbed on a sharp metal bracket or it has been sliding back and forth on the body, and things like that.
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Wednesday, July 17th, 2013 AT 10:30 AM

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