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: 710 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. P0120-13: Throttle / Pedal Position Sensor / Switch “A” Circuit– Diagnostic fault check to detect unplugged error for accelerator pedal sensors Overview: DTC Description (User Friendly) Diagnostic fault check to detect unplugged error for accelerator pedal sensors ECU Pin Number K041, K025, K024, K07, K027, K026 Customer Symptom MIL ON, No Acc. Pedal Response Fault Effects (On Vehicle) No Pedal Response, Engine Idle RPM raise, Cruise Control Off Lamp Status (If Any) MIL ON, CEL OFF Fault Detection Condition (Root cause) Accelerator Pedal sensor dis-connection. Normal Operating Condition No Fault Code Probable Trouble Area Accelerator pedal Sensor Connector, Wh connections btw ACc Ped sensor and EMS ECU, Accelerator Pedal Sensor, EMS 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 (~2.23 – ~ 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: 1. 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. 2. Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to earlier issue closure. 3. Check for any other faults presence related to ECU Internal power supplies; Follow rectification process for those faults, before proceeding further. 4. Check whether the Accelerator pedal sensor connector is broken / dis-connected. 5. Check for Wiring Dis-continuity between Accelerator Pedal Sensor & EMS ECU. If found, fix them Trouble Shooting: Step Checks IF YES IF NO 1. Check for any other faults presence related to ECU Internal power supplies / Accelerator pedal sensor / Brake Pedal Sensor. Follow rectification process for the faults, before proceeding further Go to Step 2 2 Check for electrical continuity between ECU to Accelerator Pedal sensor connector as per the circuit schematic. Continuity exists? Go to Step 3 Establish continuity by rectifying harness
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