Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1.0 Date: 30/11/2019 Author: ERC Page 541 of 610 Copyright by TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without our consent NA P0123-11: Throttle/Pedal Position Sensor/Switch "A" Circuit High Overview: DTC Description as per ISO standard Throttle/Pedal Position Sensor/Switch “A” Circuit High ECU Pin Number B59, B32, B15 Customer Symptom Engine Power Loss Fault Effects (On Vehicle) Reduced torque Mode is activated. Pedal reduction (P1121) is set EGR is disabled. Lower of the two accelerator pedal track inputs will be used by EMS for Engine control Lamp Status (If Any) CE Lamp is on Fault Detection Condition This DTC gets logged because of Track 1 counts read by the sensor is more than upper threshold. Normal Operating Condition Diagnostic tool display the value of accelerator pedal pressed in % at ignition ON condition Probable Trouble Area Accelerator Pedal sensor Related wiring Harness, connector or terminals ECU Healing Condition Rectify the error Clear through diagnostic tool Ignition OFF & ON Component Details: For safety reasons, the accelerator pedal sensor is equipped with 2 resistors (potentiometers) with varying operating ranges (0.75 – 4.45 V and 0.38 – 2.23 V) and separate circuits. A potentiometer informally a pot, is a three- terminal resistor with a sliding contact that forms an adjustable voltage divider. If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat. Based on the Accelerator pedal position, Engine will produce the driver demanded torque based on the accelerator pedal position. Preliminary Checks: Check whether the customer voice / view about the issue is matching with the fault effects mentioned above. If yes, go ahead with next steps. If not, check for other DTC’s presence. Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to earlier issue closure. Check for Reference voltage 2 fault if present; Follow Reference voltage2(sensor supply voltage2) check and rectification Procedure, to correct this fault before proceeding further Check the pedal connector connected to the pedal sensor/ module. Check sensor connections for rust dirt etc; clean the sensor connections and ensure proper fitment.
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