TIAGO AMT Gasoline DTC Troubleshooting Guide Version: 2.0 Date: 06-06-2016 Author: Sathi/Anupama Page: 233 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. 74. P2904-02: Clutch System Closing during Engage Overview: ISO Code P2904-02 Customer Symptom No gearshifts, Sudden shift to neutral while driving Fault Effects (On Vehicle) No gearshifts, Sudden shift to neutral while driving Lamp Status (If Any) Transmission Fault Lamp OFF Fault Detection Condition This fault gets detected after Ignition On during a gearshift when clutch is found to be closing without commanded close. Normal Operating Condition TCU detects correct clutch response during clutch opening for gearshift Probable Trouble Area Clutch Electro valve / TCU / Clutch Healing Condition Fault is cleared on next successful gear shift Component Details: In an AMT system, the clutch is electro-hydraulically controlled by the TCU. Preliminary Checks: 1) Loose/ Damaged Valve body and TCU mountings. 2) Check for damage or back out of pins at TCU connector. 3) Check visibly for kit Oil leakage and ensure with diagnostic tool that kit oil pressure is in range 38 - 51 bar 4) Check for mechanical damage to the clutch housing, clutch actuator mechanical fitments 5) Check correct fitment of ground cable connections on vehicle chassis. Trouble Shooting:- Step Checks IF YES IF NO 1. Check the clutch assembly and AMT clutch lever interface for mechanical damage, stuck particle, lubrication loss etc? Go to Step 2 Rectify/replace the component 2. Check clutch electrovalve electrical connections by following same procedure as for DTC P0900. Are electrical connections OK? Go to Step 3 Establish continuity by rectifying harness connections as per the circuit schematic 3. Using TCU diagnostic tool, initiate clutch actuation routine.Moni Variable and confirm that it changes from engaged (~xxx mm) to disengaged (yyy mm) position. (Alternately visibly check the clutch lever movement with actuation command.) Is the clutch engaging and disengaging freely? Recheck the above steps Replace the valve body (Mechatronic gear Actuator), if fault persists then Replace Kit - the following points by referring TCU parameters using TML diagnostic tool before handing over to customer. Drive the vehicle through all gears in both Automatic and Manual modes Ensure no DTC is active and Transmission Fault Lamp is OFF. Circuit Schematic Diagram:
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