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  1. #1
    Active Member Two Rings
    Join Date
    Sep 22 2016
    AZ Member #
    381503
    My Garage
    1984 f-250 inline 6
    Location
    Washington

    Need help with CTS? Both fans run while car on.

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    I have a very difficult problem to figure out. Just got the obdeleven so now i can see what the real problem is. I have changed the CTS recently to try and fix this. (3rd one since 75K miles)

    What happen: At about 90K had a CEL for the CTS. Went to change it, the sensor plastic plug crumbled in my hand and left me with 2 wires. I rigged it as best i could with new wire taping it blah blah.
    So it worked for a while then (because of the place with the heat coming from the CC) the tape fails and the CEL tripped it again.

    This time when i replaced it only this time, the gauge shows fine but both fans turn on when car starts and turn off 5 secs after car is off. AC on or off does not make a difference. I also noticed a small leak and figured it was time to take it in.

    New flange and sensor (plus other heater core piping) replaced to fix the leak, the shop fixed up the wires for me a little better with heat shrink etc.

    Today i scanned it with the OBDeleven and what it shows is interesting. i do get a

    p0118 circuit high
    lower limit not reached
    1622 U/min
    49%
    40 km/h
    -40c
    31c
    1010 mbar
    13.462 V
    1.0 *v.OT

    This is with a brand new sensor.
    The one i replaced had same readout.

    Thanks!
    Last edited by StanShepel; 09-30-2016 at 12:11 AM.

  2. #2
    Active Member Two Rings
    Join Date
    Sep 22 2016
    AZ Member #
    381503
    My Garage
    1984 f-250 inline 6
    Location
    Washington

    Could it be that the wires are plugged into the wrong pin? I thought it would not matter, but would that be a worthwhile check?

  3. #3
    Active Member Two Rings
    Join Date
    Sep 22 2016
    AZ Member #
    381503
    My Garage
    1984 f-250 inline 6
    Location
    Washington

    Turned out to be a frayed wire running behind the engine that would arc out only the ECU send. Replaced the wiring to the sensor.

  4. #4
    Veteran Member Four Rings aluthman's Avatar
    Join Date
    Mar 24 2013
    AZ Member #
    111961
    Location
    Oakdale, CT

    Glad you found the problem. Thanks for updating the thread for people in the future.
    -Adam

    '07 DTM A4 2.0T|6MT|EFR 7163 Twin Scroll|DoTuning|Built Motor|Meth and other go fast stuff…
    '06 A4 2.0T Quattro - RIP (Best ¼ mile pass 13.634 @ 103.30)

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