TIAGO/TIGOR AMT Gasoline DTC Troubleshooting Guide Version: 4.0 Date: 18-04-2017 Author: Sathi/Anupama Page: 278 of 427 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. 87. P0942- 07: Hydraulic Circuit – Pump Overheating Overview: ISO Code P0942-07 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 if estimated Pump temperature by TCU exceeds a Threshold. Normal Operating Condition Estimated pump temperature by TCU is within normal operating limits. Probable Trouble Area Wiring Harness Connections / TCU / Kit Healing Condition 2000 milliseconds after valid detection of healed condition 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) If this DTC occurs together with P0932 & P185C, it must be rectified last. 2) Loose/ Damaged Connections of Electric Motor and TCU 3) Check for damage or back out of pins at TCU connector, electric motor connector. 4) Check visibly for kit Oil leakage and oil level. 5) Check Battery voltage and state of charge. 6) Check for mechanical damage to the gearbox – loose or damaged valve body/TCU mountings, Hydraulic tank/accumulator, Connecting pipes mechanical fitments 7) 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 the DTC’s- P185C, P0942-01, P0932 or P2712? Rectify the other DTC’s first 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, does the DTC recur? Go to Step3 Release vehicle to the customer after final drive test 3. Check Hydraulic pressure sensor and relay electrical connections by following same procedure as for DTC’s – P0932 & P185C respectively, Are electrical connections OK? Go to Step 5 Establish continuity by rectifying harness connections as per the circuit schematic 4 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 If No pump turn ON: Go to Step 5 If Pump turns ON but no pressure build up: Go to Step 6
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