TIAGO/TIGOR AMT Gasoline DTC Troubleshooting Guide Version: 4.0 Date: 18-04-2017 Author: Sathi/Anupama Page: 274 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. 86. P0942- 01: Hydraulic Circuit – Pressure Low Overview: ISO Code P0942-01 Customer Symptom No gearshifts Fault Effects (On Vehicle) No gearshifts Lamp Status (If Any) Transmission Fault Lamp ON Fault Detection Condition This fault gets detected after Ignition On during pump commanded ON if hydraulic pressure read by sensor is found to be below a threshold. Normal Operating Condition Hydraulic pressure during normal hydraulic system operation is between 38-51 bar 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) 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. 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 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 Go to step 4 Rectify/Replace the motor 4 Replace parts in following order and reverify: If the pump failed to turn ON: 1> Replace the Pump relay 2> Replace the TCU 3> Replace the Kit Recheck the above steps
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