TIAGO AMT Gasoline DTC Troubleshooting Guide Version: 2.0 Date: 06-06-2016 Author: Sathi/Anupama Page: 282 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. 88. P2712- 07: Hydraulic Circuit Leakage too high Overview: ISO Code P2712-07 Customer Symptom Malfunction in manual upshift/downshift, earlier/late upshifts/downshifts, jerky/sluggish gearshifting, sudden shift to neutral while driving, No gearshifts Fault Effects (On Vehicle) Malfunction in manual upshift/downshift, earlier/late upshifts/downshifts, jerky/sluggish gearshifting. 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 a leakage of hydraulic oil greater than a threshold Normal Operating Condition Hydraulic oil leakage with electro valves commanded OFF is within acceptable limits 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. 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. Check Hydraulic pressure sensor and relay electrical connections by following same P0932 & P185C respectively, Are electrical connections OK? Go to Step 2 Establish continuity by rectifying harness connections as per the circuit schematic 2 Using TCU diagnostic tool, initiate a hydraulic pump activation routine and monitor the hydraulic pressure, does the pump turn ON audibly and hydraulic pressure is 38-51 bar? Clear the DTC and drive the vehicle through all gears for 5 kms ,Recheck the above steps if fault recurring If No pump turn ON: Go to Step 3 If Pump turns ON but no pressure build up: Go to Step 4 3 Check the Electric motor (refer DTC P185C), are the connections and grounding proper? Replace the motor and recheck step 2, If problem persists Goto step 4 Rectify/Replace the motor
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