P0123 Throttle Position Sensor Circuit High Voltage Error? | FerrariChat
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P0123 Throttle Position Sensor Circuit High Voltage Error?

Discussion in '348/355' started by Hexus, May 15, 2017.

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  1. Hexus

    Hexus Karting

    May 24, 2008
    50
    Moscow, Russia
    #1 Hexus, May 15, 2017
    Last edited: May 15, 2017
    There is P0123 Throttle Position Sensor Circuit High Voltage Error occurs every drive on '97 5.2 Motronic Euro model F355. After all errors delete via OBD scanner P0123 appears on ingnition key pos. 2 first time and second time somewhere during 1-2 hour drive (there is also check engine light appears accordingly). No other errors in Motronic. Throttle potentiometer sensor was replaced with no result.

    Where else to look?

    Thank you!
     
  2. Qavion

    Qavion F1 World Champ
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    Feb 20, 2015
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    #2 Qavion, May 16, 2017
    There is really nothing in the circuit other than wiring and the Motronics ECU. Could there be an intermittent short in the wiring?

    Basic wiring
     
  3. markcF355

    markcF355 F1 Rookie

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    #3 markcF355, May 16, 2017
    It sounds like the ground is loose.
     
  4. Hexus

    Hexus Karting

    May 24, 2008
    50
    Moscow, Russia
    #4 Hexus, May 16, 2017
    Common ground?
     
  5. markcF355

    markcF355 F1 Rookie

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    #5 markcF355, May 16, 2017
    I don't know. The center wire on Qavion's diagram (BN wire) goes to ground to form a voltage divider. If the ground is loose, the full 5 volts goes back to the sensor input on the ECU.
     
  6. Qavion

    Qavion F1 World Champ
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    #6 Qavion, May 16, 2017
    It's a common ground, shared by the knock (both banks), inlet air temperature and coolant temperature sensors.
     
  7. taz355

    taz355 F1 Veteran
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    #7 taz355, May 16, 2017
    As I said in your other thread for bypass valve.

    Check continuity for pin 53 and 44 from the sensor back to the ecu. Then you know the wires are .good
     
  8. Hexus

    Hexus Karting

    May 24, 2008
    50
    Moscow, Russia
    #8 Hexus, May 30, 2017
    Problem solved. Cause and solution as described here:

    http://www.ferrarichat.com/forum/140019658-post13.html

    TPS and Knock Sensor connectors had been switched. Agrrr....

    FYI - TPS connector is black! KS connector is grey (it's seems not logical as receiver connector for it is grey but is it so, we have checked wiring to ecu).

    Thanks to everyone!
     
    360_Lawlie likes this.
  9. Qavion

    Qavion F1 World Champ
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    #9 Qavion, May 30, 2017
    Pozhaluista :D

    Thanks for the update.

    Cheers
     
  10. taz355

    taz355 F1 Veteran
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    #10 taz355, May 30, 2017
    Nice to know that switching the plugs does not hurt anything. Thanks for update.
     

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