Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1.0 Date: 30/11/2019 Author: ERC Page 402 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 ECU Pin Number B3, B5, B6, B41, B43 & B64 Customer Symptom Engine may not start. AC off. Reduced torque mode active. Battery Charge Indication in Cluster will be ON. Fault Effects (On Vehicle) Reduced torque mode active Disables wiring harness resistance Pulse corrections for all injectors. Disabled RVD for all Injectors Disable EGR IMV operates without any trim correction. High pressure leak detection test is prevented. Rail Pressure demand value is limited to 800 bar. Lamp Status (If Any) CE lamp is on. Fault Detection Condition This DTC gets logged if the Battery voltage read by the ECU is less than lower threshold. Normal Operating Condition Diagnostic tool display the value of battery voltage greater than 6 volts at ignition ON condition Probable Trouble Area Battery, Alternator, ECU, Grounding points, Wiring harness. Healing Condition Clear the errors, Ignition OFF to ON Battery voltage > 6 V and engine running / Engine not running Component Details: Lead Acid Battery provides supply voltage to all vehicle electrical and electro mechanical components Preliminary Checks Check whether the customer voice / view about the issue is matching with the fault effects mentioned above. If yes, go ahead with next steps. If not, check for other DTC’s presence. 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 & B41 are connected to battery positive – 12 V supply.
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