Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1.0 Date: 30/11/2019 Author: ERC Page 409 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 the charging circuit; Rectify the charging circuit if faulty. Check ECU pin no B1, B2,& B4 are getting ground connection and B3, B5, B6 & B41 are connected to battery positive – 12 V supply. 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 functioning Go to Step 6 Repair / Replace 6 Are EMS ECU pins B3/B5/B6/B41 Short circuited to GND. Repair the harness as per the schematic Go to Step 7 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 Reading should be close to 12 V if alternator is not charging. Reading should be close to 14 V if alternator is charging Rectify the errors if any & confirm that no any error present in ECU before handed over vehicle to customer
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