P2122 MERCEDES-BENZ – Throttle/Pedal Position Sensor/Switch ‘D’ Circuit Low

 

P2122: DIY Repairing Video Tutorial

https://youtu.be/9BX5PHm89ho

Check out nonda Auto DIY Center for more engine error code repairing videos.
https://www.youtube.com/playlist?list=PL-Lyko0O0oxHe1AGvzwAz-wokJPXAtW97

 

P2122 MERCEDES-BENZ Possible Symptoms

  Engine Light ON (or Service Engine Soon Warning Light)  

P2122 MERCEDES-BENZ Possible Causes

  Faulty Accelerator Pedal Position Sensor,Accelerator Pedal Position Sensor harness is open or shorted,Accelerator Pedal Position Sensor circuit poor electrical connection  

P2122 MERCEDES-BENZ Description

  This fault code is stored in the Engine Control Module (ECM) when a fault is detected with the circuit monitoring throttle and accelerator pedal position. Both circuits are closely monitored for plausibility checks. The ECM can easily identify erroneous data by monitoring both circuits for an inconsistency between the throttle position sensor voltage and the accelerator pedal position sensor voltage. Normally potentiometers are used for both sensor circuits, however some manufacturers may use a hall effect sensor with a varying frequency depending on position. Another feature of modern vehicles is using multiple sensors for redundancy and fault analysis. This is where a technician would see data for accelerator pedal position sensor 1 and 2 or throttle position sensor 1 and 2. The voltages from these components can be inversely proportional or a stepped waveform with only output half the output of the other.