NEXON NEW MCE-2 DCT BS VI DTC Troubleshooting Guide Version: 1.0 Date: 16-06-2023 Author: Akash/Rahul Page:241 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. 69. P0885-49 Battery sensor supply: circuit defect Overview: ISO Code P0885-49 Customer Symptom • Transmission fault lamp ON • Warning message after 100km Fault Effects (On Vehicle) • Transmission fault lamp ON • Warning message after 100km Lamp Status (If Any) Transmission fault lamp ON Service indication 0x2 Fault Detection Condition Battery Sensor supply <0,5V when enabled OR Battery Sensor supply >5V when disabled(FFT = 50ms) Normal Operating Condition TCU does not detect any fault Probable Trouble Area 1. Transmission and vehicle wiring loom for connections to ground. 2. TCU. Healing Condition The reaction is cleared at SW restart and driving if the detection is FALSE for more than 100 ms Component Details: There are 2 TCU power supplies – 1 Ignition and 1 battery power for driving valves and the hydraulic pump. The Problem may occur due to an electrical problem or internal damage to TCU. Preliminary Checks: 1) Blown out TCU power fuses (2 X 30 Amp) 2) Battery voltage and state of charge. 3) Loose Fitting TCU connectors. 4) Check for damage or back out of pins at TCU pin connector. 5) Check correct fitment of ground cable connections on vehicle chassis. Trouble Shooting:- Step Checks IF YES IF NO 1. Check the transmission and vehicle wiring loom for connections to ground. Is there any rust/oxidation/pin back out observed on TCU all PIN in vehicle side TCU 28 pole connector? Clear the DTC and check if the DTC does not come back. Go to step 2 2. IF DTC persists, Check with different TCU if the problem persists (flash the adaption data from the original TCU). If DTC stays away with different TCU; replace TCU, 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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