Download Vehicle Application: 2000 Mercedes-Benz ML320 3.2L 2001 Mercedes-Benz E320 3.2L 2001 Mercedes-Benz C240 2.6L 2001 Mercedes-Benz E320 4Matic 3.2L 2001 Mercedes-Benz C320 3.2L 2002 Mercedes-Benz ML320 3.2L Customer Concern: Engine light is on with no acceleration. Fault code is P0120. Tests/Procedures: 1. Connect scan tool and monitor voltages of pedal sensor B37. Signal 1 (Accelerator pedal position: Idle speed):[0.2...0.5] V Signal 2 (Accelerator pedal position: Idle speed):[0.1...0.5] V Signal 1 (Accelerator pedal position:Kickdown):[4.3...4.8] V Signal 2 (Accelerator pedal position:Kickdown):[2.1...2.5] V 2. If voltages are out of specification verify correct reference voltage to sensor by measuring between pins 6 (Black/White wire) and pin 1 (Blue/Grey wire) on pedal sensor connector. Voltage needs to be between 4.75 and 5.25 volts. 3. Test throttle body voltages with scan tool. Potentiometer #2 signal voltage ignition on, accelerator pedal position CTP 0.3-0.9 VDC, WOT > CTP value Potentiometer #1 signal voltage Ignition on, accelerator pedal position CTP 4.0-4.6 VDC, WOT < CTP value. 4. Test mass air flow sensor voltage. Sensor signal voltage must start KOEO around 1 volt and go up as engine RPMs increase. This can also be seen under air sensor volume output, output value must go up not down. Potential Causes: Pedal Sensor Throttle Body Wiring Tech Tips: With new sensor the throttle stops must be relearned. Use compatible scan tool and perform adaptations. ALWAYS verify charging system voltage is correct. Diagnostic Codes: P0120, P203b Author: Brian Franta Average Reported Mileage: 87893 Confirmed Fix Summary Confirmed Fix 1 – Accelerator Pedal Position Sensor B37, Throttle Body, Throttle Body Relearn 1 – Accelerator Pedal Position Sensor B37 1 – Pedal Value Sensor 1 – Throttle Body. Confirmed Fix Details Tech Reported Fix Details Confirmed Fix Alan Takeshita January 04, 2010 2001 Mercedes-Benz C320, 3.2L * Replaced Accelerator Pedal Position Sensor B37 42,939 miles Accelerator Pedal Position Sensor B37 Chris Meyers August 21, 2009 2000 Mercedes-Benz ML320, 3.2L * Replaced Accelerator Pedal Position Sensor B37 Replaced Throttle Body Performed Throttle Body Relearn — Had to send to dealer to perform relearn. Fault code did not go away with new parts installed until the relearn was performed.
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