Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1 Date: 23/11/2022 Author: ERC Page 69 of 834 Copyright by TATA MOTORS Ltd. This document must not be used in any w ay, such as copying and redistributing to third parties, w ithout our consent 1. Check Battery Voltage at key on (min 11.5 V) 2. Check the battery condition (Terminal damage/wear, Acid leak, low Specific gravity, low acid level) Trouble Shooting Steps: Sr. No. Steps Specifications Step 1 Check the Battery voltage with the ignition switch on. If the voltage is too low then recharge the battery to 12 V Nominal range: 11.5 ~ 12.8V Step 2 Check whether the battery terminals are connected properly and they are tight. If not proper, do the necessary repair - Step 3 Check ECU connection: 1] Key off 2] Remove the ECU 3] Connect ECU connector Properly 4] Key on and Read the faults - Step 4 Check the charging circuit – Alternator to battery connection & engine body ground. In case of any problems in charging circuit, do the necessary repair - Step 5 Check for any damage in alternator cut off circuit. If found, replace the alternator - Step 6 Check the starter motor for any damage or starter motor positive line short circuit to ground. If any such abnormality observed, correct it - Step 7 Check the Battery voltage through multimeter and if ECU reads higher value than the multimeter then replace the ECU. - Associated Parameters: Parameter Label Description DID Monitoring Battery voltage raw Current Battery voltage read by the ECU FE00 Nominal range - 11.5V to 12.8V Verification condition: Drive the vehicle in city and highway condition for 20 mins. Circuit Description: The battery supplies electricity to ECM even when the ignition switch is OFF. This electricity allows ECM to store data such as DTC history, freeze frame data, fuel trim values and other data. If the battery voltage falls out of range, ECM will conclude that there is a fault in the power supply circuit. Circuit Schematic Diagram:
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