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: 977 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. P2299-2A: Brake Pedal Position / Accelerator Pedal Position Incompatible – Brake and accelerator pedal coherence Overview: DTC Description (User Friendly) Brake and accelerator pedal coherence ECU Pin Number K041, K025, K024, K07, K027, K026, K035, K010 Customer Symptom Vehicle may accelerate even with Brake Press. Fault Effects (On Vehicle) Unintended Acceleration, Accelerator pedal / Brake pedal may not move freely. Lamp Status (If Any) MIL OFF, CEL OFF Fault Detection Condition (Root cause) When Brake is pressed (EMS ECU Brake switch input active) & Engine Speed > 520 RPM and Vehicle Speed > 10 KMPH then fault gets logged. Normal Operating Condition No Fault Code Probable Trouble Area Accelerator pedal stuck / Brake pedal stuck / EMS ECU Brake Switch input WH faulty, Accelerator Pedal sensor input to EMS ECU faulty / Accelerator Pedal Sensor / Brake Switches / 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. For safety reasons, Brake pedal is equipped with two Switches. These switches transition their states when the brake pedal is pressed. EMS ecu uses the brake press information in its control strategies like Torque demand calculation, Gear Shift indication, Accelerator pedal stuck detection, vehicle start function when clutch sensor fails etc., 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 with User whether he has a habit of driving vehicle with Accelerator Pedal and Brake Pedal simultaneous press. 4. Check for any other faults presence related to ECU Internal power supplies; Follow rectification process for those faults, before proceeding further. 5. Check whether the Accelerator and Brake Pedals are moving freely. Else look for Mechanical issues and correct them. 6. Check whether any other faults related to Accelerator pedal sensors / Brake switches are present. If yes, rectify them by following their rectification procedure. 7. Check for Wiring Dis-continuity between Accelerator Pedal Sensor & EMS ECU. If found, fix them
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