NEXON NEW MCE-2 DCT BS VI DTC Troubleshooting Guide Version: 1.0 Date: 16-06-2023 Author: Akash/Rahul Page:406 of 645 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. 116. P3012-46 TCU Memory / mismatch: ROM Calibration data checksum (Internal memory failure) Overview: ISO Code P3012-46 Customer Symptom • Critical malfunction. Powertrain is opened. Power loss immediately triggered- Gearshift is disabled • Transmission fault lamp ON • Creep function is disabled Fault Effects (On Vehicle) • Critical malfunction. Powertrain is opened. Power loss immediately triggered- Gearshift is disabled • Transmission fault lamp ON • Creep function is disabled Lamp Status (If Any) Transmission fault lamp ON (Service indication 0x1) Fault Detection Condition Internal TCU failure Normal Operating Condition ROM /RAM/Flash memory checksum integrity is valid Probable Trouble Area 1. TCU. Healing Condition The reaction is cleared at SW restart 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 Check with different TCU if the problem persists (flash the adaption data from the original TCU). If NOK, replace TCU, Clear the DTC and check if the DTC does not come back. If the fault is not reported in the replacement TCU, replace the original TCU on the car. DTC’s confirmation:- After rectification, clear all DTC’s and ensure 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. Circuit Schematic Diagram:- Component Location & Image:-
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