Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1.0 Date: 30/11/2019 Author: ERC Page 399 of 610 Copyright by TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without our consent Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to earlier issue closure. Check for pin back out at EMS ecu connector or EGR valve connector. Check the battery voltage with the ignition switch on as well as voltage drop during cranking. If the voltage is too low, then recharge the battery. Check main power hold relay is working properly. Check and ensure whether the battery terminals are connected properly and they are tight. Check the charging circuit; Rectify the charging circuit if faulty. Check ECU pin no B1, B2& B4 are getting ground connection and B3, B5, B6 are connected to battery positive – 12 V supply. Check ECU; Replace ECU if problem still persists. Trouble Shooting: Step Checks IF YES IF NO 1. Is there any rust/oxidization / Sulphation observed on Battery Terminals Clean the Rust or repair. Go to Step 2 2. Is there wiring harness electrical continuity between ECU pins B3, B5, B6 & main Relay supply. Go to Step 3 Establish continuity by rectifying harness connections as per the circuit schematic 3. Are there any pins damaged at EMS ECU Connector Replace the connector or wiring harness Go to step 4 4 Are there any pins backed out from the EMS ECU Connector Rectify/Replace Connectors Go to Step 5 5 Is Alternator mal-functioning Go to Step 6 Repair / Replace 6 Are EMS ECU pins B3/B5/B6 and B1/B2/B4 connected properly? Go to step 7 Repair the harness as per the schematic 7 Is Rectifiers in Alternator functioning properly? Repair / Replace Go to Step 8 8 Fault Still Persists? Call Hot line Follow the steps again for reconfirmation DTC’s confirmation (checks before handing over vehicle to customer): Confirmatory check after rectification - Check battery voltage in diagnostic tool at engine idle condition
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