TIAGO AMT Gasoline DTC Troubleshooting Guide Version: 2.0 Date: 06-06-2016 Author: Sathi/Anupama Page: 288 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. 90. P0780- 07: Hydraulic Circuit System Misuse Overview: ISO Code P0780-07 Customer Symptom Malfunction in manual upshift/downshift, earlier/late upshifts/downshifts, jerky/sluggish gear shifting, sudden shift to neutral while driving, No gearshifts Fault Effects (On Vehicle) Malfunction in manual upshift/downshift, earlier/late upshifts/downshifts, jerky/sluggish gear shifting, sudden shift to neutral while driving, No gearshifts Lamp Status (If Any) Transmission Fault Lamp ON if level 2 or 3 error(higher in severity) Fault Detection Condition This fault gets detected after Ignition On when gear shifts are not in progress but TCU detects that: a> Pump Temperature exceeds a threshold AND b> In manual mode, Driver is requesting more number of gearshifts within a time window than a threshold OR c> In Auto mode, driver is continuously pressing/releasing throttle Normal Operating Condition Pump temperature is below a threshold and Driver shift requests do not exceed a threshold in a time span window. Probable Trouble Area Improper Driving habits /TCU/kit Healing Condition 10 milliseconds after valid sensor signal 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. In case the driver requests gearshifts too frequently than normal driving conditions, the pump has to activate more frequently and may lead to overheating. 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 - P0820/821/822/823/825, P0945, P0942 or P2712? 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 Step 3 Release vehicle to the customer after final drive test 3 Check Hydraulic pressure sensor and relay electrical connections by following same P0932 & P185C Go to Step 4 Establish continuity by rectifying harness
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