TIAGO AMT Gasoline DTC Troubleshooting Guide Version: 2.0 Date: 06-06-2016 Author: Sathi/Anupama Page: 285 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. 89. P2901- 01: Hydraulic Circuit Accumulator discharged Overview: ISO Code P2901-01 Customer Symptom Vehicle cranking after some attempts Fault Effects (On Vehicle) Vehicle cranking after some attempts Lamp Status (If Any) Transmission Fault Lamp OFF Fault Detection Condition This fault gets detected after Ignition On when gear shifts are not in progress but TCU detects that the charging rate of the hydraulic accumulator is greater than a threshold. Normal Operating Condition Charging rate of the accumulator is below a threshold if it is not fully discharged. Probable Trouble Area Wiring Harness Connections / TCU / Kit Healing Condition Fault is cleared on next ignition Power ON Component Details: In an AMT system, the hydraulic pump is driven by the TCU whenever the hydraulic pressure read by sensor drops below a threshold. The pump charges an accumulator which stores pressurized hydraulic fluid to be used by shift, engage and clutch actuators. Preliminary Checks: 1) Loose/ Damaged Connections of Electric Motor and TCU 2) Check for damage or back out of pins at TCU connector, electric motor connector. 3) Check visibly for kit Oil leakage and oil level. 4) Check Battery voltage and state of charge. 5) Check for mechanical damage to the gearbox loose or damaged valve body/TCU mountings, Hydraulic tank/accumulator, Connecting pipes mechanical fitments 6) Check correct fitment of ground cable connections on vehicle chassis. Trouble Shooting:- Step Checks IF YES IF NO 1 Is the DTC occurring in combination with any of - P185C, P0942-01, P0932 or P2712? Rectify the other Go to Step 2 2 At first occurrence of the problem, clear the DTC and drive the vehicle in all gears for about 10 km simulating /in real dense traffic condition requiring frequent gearshifts , does the DTC recur? Go to Step3 Release vehicle to the customer after final drive test 3 Check the kit assembly for mechanical damage, sealing, lubrication etc?Is it OK? Go to Step 4 Rectify/replace the kit 4 Check Hydraulic pressure sensor electrical connections by following same procedure as for DTC P0932, Are electrical connections OK? Replace the kit Establish continuity by rectifying harness connections as per the circuit schematic & Release vehicle to the customer after final drive test - 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.
RkJQdWJsaXNoZXIy MTIwNTUz