Q501 4 Cylinder MT Application DTC Troubleshooting Data Version: 0.1 Date: 21-Sep-2018 Prepared By: Mithi Prasad, Sarang Kulkarni, Manish Gupta Checked By: Yogesh Jadhav Approved By: Satish Kumar P Page: 20 of 1052 Copyright © TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without the consent of author. P0122-11: internal fault path number: short circuit to GND of accelerator pedal signal 1 Overview: DTC Description as per ISO standard Internal fault path number: short circuit to GND of accelerator pedal signal 1- Signal Short to Ground. ECU Pin Number Accelerator pedal potentiometer pin K41,K25,K24,K07,K27,K26 Customer Symptom MIL Lamp ON Fault Effects (On Vehicle) Engine torque limitation Regeneration OFF Lamp Status (If Any) MIL On Fault Detection Condition (Root cause) At ignition On accelerator pedal pressed Normal Operating Condition No Fault Code Probable Trouble Area 1. Accelerator pedal position sensor 1 supply open circuit. 2. Accelerator pedal position sensor 1 signal short to ground. 3. Accelerator pedal position sensor 1 ground short to ground. 4. Accelerator pedal position sensor 1 ground open circuit 5. Accelerator pedal sensor. 6. EMS ECU Healing Condition 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 the pedal connector connected to the pedal sensor/ module. • Check sensor connections for rust dirt etc; clean the sensor connections and ensure proper fitment. • Check Intermediate connector; Remove Intermediate connector between EMS harness and vehicle wiring harness. Check for terminal back out. Do necessary repairs, then reconnect and check the fault. • Visually check sensor; Replace sensor if damaged.
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