NEXON NEW MCE-2 DCT BS VI DTC Troubleshooting Guide Version: 1.0 Date: 16-06-2023 Author: Akash/Rahul Page:519 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. 146. P3128-00 Clutch pressure mismatch Overview: ISO Code P3128-00 Customer Symptom • Critical malfunction. Powertrain is opened. Power loss immediately triggered • Transmission Fault Lamp ON • Gearshift and creep function is disabled Fault Effects (On Vehicle) • Critical malfunction. Powertrain is opened. Power loss immediately triggered • Transmission Fault Lamp ON • Gearshift and creep function is disabled Lamp Status (If Any) Transmission Fault Lamp ON (Service indication 0x1) Fault Detection Condition triggered when safety software detects wrong clutch actuated, compared to target Normal Operating Condition TCU does not detected any fault. Probable Trouble Area 1. HCU. 2. TCU. 3. Transmission. Healing Condition The reaction is cleared at SW restart and driing if the detection is FALSE for more than 0 ms Component Details: The Problem may occur due to an internal damage to TCU and DT1 transmission. Preliminary Checks: 1) Loose/ Damaged Connections between Electro valve and TCU. 2) Loose/ Damaged mechanical fitments of TCU (TCU to valve body mounting). 3) Check correct fitment of ground cable connections on vehicle chassis. Trouble Shooting:- Step Checks IF YES IF NO 1. perform CPC adaption Clear the DTC and check if the DTC does not come back. Go to step 2 2. if fault persists, replace HCU, and perform necessary adaptions Clear the DTC and check if the DTC does not come back. Go to step 3 3. If fault persists replace TCU, and flash/perform necessary adaptions Clear the DTC and check if the DTC does not come back. Go to step 4 4 If fault persists replace transmission Clear the DTC and check if the DTC does not come back 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:-
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