TIAGO AMT Gasoline DTC Troubleshooting Guide Version: 2.0 Date: 06-06-2016 Author: Sathi/Anupama Page: 337 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. 113. P0881- 03: TCU 12V Internal Supply Device closed* *This particular fault may not be detectable with the diagnostic tool as TCU will fail to run. Overview: ISO Code P0881- 03 Customer Symptom No gearshifts , Vehicle not cranking, Vehicle not picking up, vehicle stuck in gear while driving , gear shift request by lever disabled Fault Effects (On Vehicle) No gearshifts , Vehicle not cranking, Vehicle not picking up, vehicle stuck in gear while driving , gear shift request by lever disabled Lamp Status (If Any) Transmission Fault Lamp OFF Fault Detection Condition This fault gets detected after Ignition On if the TCU detects that the +12V internal supply of the TCU is above a threshold. Normal Operating Condition +12V supply of the TCU is in a proper range Probable Trouble Area TCU damage Healing Condition 50 milliseconds after valid signal Component Details: The Problem may occur due to an internal damage to TCU. Preliminary Checks: 1) Battery voltage 2) Check for damage or back out of pins at TCU connectors. 3) Check correct fitment of ground cable connections on vehicle chassis (tightness, corrosion of mounting bolts etc.) . Trouble Shooting:- Step Checks IF YES IF NO 1 At the first instance of the fault, clear the DTC and run the vehicle in all gears for about 10 kms, does the fault recur? Go to Step 2 Release the vehicle to the customer after final drive test 2 Check Battery and Ignition supplies at pins 1,3and 5 respectively. Both are correct? Go to Step 3 rectify harness connections as per the circuit schematic 3 Is there any pin back out/damage/rust/oxidation observed on TCU Connector? Clean or repair or replace connector Go to Step4 4 Fault Still Persists? Replace TCU Follow the steps again for reconfirmation - the following points by referring TCU parameters using TML diagnostic tool before handing over to customer. Drive the vehicle through all gears in both Automatic and Manual modes Ensure no DTC is active and Transmission Fault Lamp is OFF.
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