TIAGO AMT Gasoline DTC Troubleshooting Guide Version: 2.0 Date: 06-06-2016 Author: Sathi/Anupama Page: 291 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. 91. P184A- 01: Hydraulic Circuit Pump Timeout Overview: ISO Code P184A-01 Customer Symptom - Fault Effects (On Vehicle) May lead to delayed cranking Lamp Status (If Any) Transmission Fault Lamp ON Fault Detection Condition This fault gets detected after Ignition On when the time of pump actuation exceeds a threshold. Normal Operating Condition Pump actuation time is usually within limits Probable Trouble Area kit Healing Condition Next power ON of TCU 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 respectively, Are electrical connections OK? Go to Step 4 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 gears for 5 kms ,Recheck the above steps if fault recurring If No pump turn ON: Go to Step 6 If Pump turns ON but no pressure build up: Go to Step 6 5 Check the Electric motor (refer DTC P185C), are the connections and grounding proper? Replace the motor and recheck step 3, If problem persists Goto step 4 Rectify/Replace the motor
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