TIAGO AMT Gasoline DTC Troubleshooting Guide Version: 2.0 Date: 06-06-2016 Author: Sathi/Anupama Page: 119 of 424 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. 36. P2903 -02: Accelerator Pedal Position Signal not valid Overview: ISO Code P2903-02 Customer Symptom Automatic gear shift disabled, no gearshift. Fault Effects (On Vehicle) Automatic gear shift disabled, (creep will active) No gearshift. Lamp Status (If Any) Transmission Fault Lamp OFF Fault Detection Condition This fault gets detected after Ignition On if EMS signals the TCU that accelerator pedal information on CAN is invalid. Normal Operating Condition EMS signals the TCU that accelerator pedal information on CAN is valid Probable Trouble Area Wiring Harness Connections / EMS / TCU Healing Condition 200 milliseconds after valid sensor signal Component Details: Accelerator pedal position signal is transmitted via CAN bus to the TCU. Preliminary Checks: 1) Loose/ Damaged Accelerator pedal sensor Connections. 2) Check for damage or back out of pins at EMS connector and TCU connector. 3) Check correct fitment of ground cable connections on vehicle chassis. Trouble Shooting:- Step Checks IF YES IF NO 1. Is there any rust/oxidation observed on EMS or TCU connectors? Clean the Rust or repair or replace Go to Step 2 2 Diagnose the Accelerator pedal input to EMS (Refer EMS service manual), is there a problem with accelerator pedal sensor or sensor to EMS connection? Ensure correct connection of accelerator pedal sensor input to EMS as per EMS service manual. Go to step 3 3 Is TCU power connections on TCU connector pins 5, 1, 3? Specifically check Ignition supply toggling with key on/off. Go to Step 4 Check and rectify harness power connections. 4 Connect the EMS diagnostic tool and check the value of accelerator pedal position with pressed and unpressed pedal, are correct values observed? Replace the TCU Go to Step 5 5 Fault Still Persists? Recheck the above steps Follow the steps again for reconfirmation - the following points by referring TCU parameters using TML diagnostic tool before handing over to customer. After key and engine ON with TML TCU diagnostic tool connected, monitor the accelerator pedal and confirm that it changes from about 0% un-pressed to about 100% when pressed fully. Drive the vehicle through all gears in both Automatic and Manual modes and
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