TIAGO AMT Gasoline DTC Troubleshooting Guide Version: 2.0 Date: 06-06-2016 Author: Sathi/Anupama Page: 271 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. 85. P190D-01: Gearbox System Clutch over speed Overview: ISO Code P190D-01 Customer Symptom Transmission Fault Lamp OFF sudden shift to neutral while driving Fault Effects (On Vehicle) sudden shift to neutral while driving Lamp Status (If Any) Transmission Fault Lamp ON Fault Detection Condition This fault gets detected after Ignition On during vehicle running if the clutch speed crosses a threshold Normal Operating Condition TCU monitors that the clutch speed is within operable safe limits Probable Trouble Area Gear Electro valve / TCU / Gearbox Healing Condition Fault is cleared on next ignition Power ON Component Details: In an AMT system, the gear shifting is actuated through 3 electrovalves viz. 2 gear electrovalves for shifting between odd and even gears and 1 shift electrovalves for shifting between ranks. 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 Valve body (MGA), kit and gearbox mechanical fitments 5) Check correct fitment of ground cable connections on vehicle chassis. Trouble Shooting:- At first occurrence of this DTC, clear the DTC and drive the vehicle through all gears for ~5 kms, on repeat occurrence of this DTC check the following. Step Checks IF YES IF NO 1 Check the kit & gearbox assembly for mechanical damage, stuck gear actuator, synchro ring damage, fork damage, gear damage, lubrication etc? Go to Step 2 Rectify/replace the gearbox 2 Check gear electrovalves electrical connections by following same procedure P0750 & P0755, 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 a grid learning procedure Are gears engaging and disengaging freely and grid learning is successfully executed? Recheck the above steps Replace parts in following order and re-verify: 1>Valve body (MGA) 2>Gearbox 3>Entire Transmission - 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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