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F430 abs error C1206

Discussion in 'Technical Q&A' started by nbegg, Nov 23, 2023.

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  1. nbegg

    nbegg Rookie

    Feb 15, 2004
    10
    #1 nbegg, Nov 23, 2023
    Hi there I have had my 430 Spider on the lift in my garage for a few weeks now and no matter what I try I keep getting a C1206 error I have had the abs ecu tested I have disconnected the abs sensor and get a similar error with the word electric at the end and even connected a used hub with a sensor and get the same error.
    If I do live data I get a reading from the sensor when spinning the disc. Can’t think what else it could be?
     
  2. Qavion

    Qavion F1 World Champ
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    Feb 20, 2015
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    Sydney
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    Ian Riddell
    #2 Qavion, Nov 23, 2023
    The only difference between the two codes seems to be the duration of the fault

    C1206

    "Front LH Speed Sensor Error: Error detected when the speed signal from the left toothed wheel is unstable or not constant. If the signal is intermittent, the ECU switches on the fault lamp when a spee dof over 12kph is reached. Sensor is fault or is not correctly (sic)"

    "Check the connection between the sensor and the electrical wring. Check the connection between the sensor and the ECU on pins 6 and 7. If the connection is correct, replace the sensor."

    C1205

    "Front LH Speed Sensor: Electrical Error: Error detecte when there is no speed signal from the front left toothed wheel sensor. Caused by: fault in the sensor or open circuit on the connection between the ECU and the sensor. The error is memorised in the historical records when the conditions are restored"

    "Check the connection between the sensor and the electrical wring. Check the connection between the sensor and the ECU on pins 6 and 7. If the connection is correct, replace the sensor."

    Do you mean the "electric" code or the other one. The electric code is the latched fault type. Are you clearing the codes after replacing/refitting components?

    Because you substituted a sensor, all that remains is an intermittent ECU or wiring issue. How was the ECU checked? On the bench or by putting it on another car?

    All I can suggest is doing wiring continuity checks whilst shaking the ECU/sensor harness. Oddly, the pins described above, do not match the 430 wiring diagrams (at least not the Scud diagrams).

    The front left sensor is on pins 13 and 14 according to the diagrams. Maybe you could confirm this?


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  3. nbegg

    nbegg Rookie

    Feb 15, 2004
    10
    #3 nbegg, Nov 23, 2023
    Hi did a bit more fault finding when unlatched get the electric code tried a replacement sensor / hub on the right and worked fine and get the same error on the left even with replacement hub. Yes I am clearing all codes everytime. The ecu was bench tested and passed extended tests I was told. I will check the two wires back to the ecu and try to connect two new ones tomorrow. Can’t think of anything else to try
     
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  4. nbegg

    nbegg Rookie

    Feb 15, 2004
    10
    #4 nbegg, Nov 23, 2023
    When I took the ecu off to send for test I was suprised it wasn’t that but also I guess I would get more errors than just the one sensor. When in live mode it seems to read ok
     
  5. nbegg

    nbegg Rookie

    Feb 15, 2004
    10
    #5 nbegg, Nov 23, 2023
    I will try and follow the cables back and check what pins they are on
     
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  6. RayJohns

    RayJohns F1 Veteran
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    May 21, 2006
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    Ray
    #6 RayJohns, Nov 24, 2023
    Do you have any after market USB stuff plugged into and/or wired into the car? Any stuff like that? Sometimes those devices do not have great shielding and can cause very odd ball errors. Keep in mind that wires often like to act as antennas and devices from China often do not include the RF shielding needed in some cases. Same can be said of iPhones in some cases.

    Just a thought.

    Ray
     
  7. nbegg

    nbegg Rookie

    Feb 15, 2004
    10
    #7 nbegg, Nov 24, 2023
    Morning thanks for that there is an after market head unit but the fault occurred before that. I will re check around battery for anything else that may have been added and also disconnect the head unit later today will report back
     
  8. nbegg

    nbegg Rookie

    Feb 15, 2004
    10
    #8 nbegg, Nov 24, 2023
  9. RayJohns

    RayJohns F1 Veteran
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    #9 RayJohns, Nov 24, 2023
    Definitely check the connectors for corrosion. Sometimes electrical connections can perform correctly at low frequency, but break down at higher Hz. Just for kicks, you might try clipping some ferrite suppression cores around the wiring harness running from the sensor just to see if it is some sort of stray interference.

    Ray
     
  10. RayJohns

    RayJohns F1 Veteran
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    #10 RayJohns, Nov 24, 2023
    Even poorly made USB cables can cause problems in some cases. Anything bluetooth (e.g. OBDII dongles, etc.)

    Ray
     
  11. nbegg

    nbegg Rookie

    Feb 15, 2004
    10
    #11 nbegg, Nov 24, 2023
    Great thanks will order ferrite connectors today worth a try thanks for the tips
     
  12. nbegg

    nbegg Rookie

    Feb 15, 2004
    10
    #12 nbegg, Nov 28, 2023
    I am away for a few days so will update my findings early next week the new accelerator sensor has arrived fingers crossed clears one error
     
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  13. nbegg

    nbegg Rookie

    Feb 15, 2004
    10
    #13 nbegg, Dec 14, 2023
    Evening thanks for your suggestions in the end I created an extension lead connected the OS hub to the near side and wiring and the fault corrected turned out the new hub also had a faulty sensor. Ordered a new hub again and fixed it also cleared all other faults so back error free
     
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