ERC, Chassis Engineering Prepared by : Sagar K Approved by: Bhavesh Raut Page | 99 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. Nexon MCE ESP DTC Troubleshooting data Document no: X01ME111219 Date: 11-Dec-19 U0100-87:- Lost Communication With ECM/PCM -Bus Signal/Message Failure Overview: ISO Code U0100-87 Customer Symptom Warning Light Displayed Fault Effects (On Vehicle) ABS – Available, EBD – Available, ESP – Depends on fault type, HDC & HHC- Depends on the fault type Lamp Status (If Any) ABS – OFF, EBD – OFF, HHC, HDC & ESP – Depends on fault type Fault Detection Condition 1. ECM connector is not connected properly or disconnected from its location. 2. CAN wire from ECM connector side are disconnected 3. ECM IGN & Battery fuse blown. 4. CAN_H, CAN_L or both lines of ECM are open circuit Normal Operating Condition ECM ECU communicates properly with TML diagnostic Tool. Probable Trouble Area 1. ECM connector / ECM fuse. 2. CAN lines of ECM ECU Healing Condition 1. ECM ECU is connected and no wiring harness issues from ECM side 2. CAN_H, CAN_L or/ and both lines of ECM are connected properly Preliminary Check: 1. Check resistance in Diagnostic CAN pin no. 8 and 9. It should be 120 Ω. 2. Check for short conditions between CAN_H (pin no. 14)-CAN_L (pin no.2), CAN_H (pin no. 14)-GND (pin no. 13), CAN_L (pin no. 2)-GND (pin no. 13), CAN_H (pin no. 14)-Vbatt (pin no. 1) and CAN_L (pin no. 2)-GND (pin no.13). There should not be any short circuit conditions. 3. Check continuity between EMS CAN_H (pin no. 81 (diesel) & pin no. 32(petrol)) vehicle side connector to vehicle side connector ESP CAN_H (pin no. 14) and EMS CAN_L (pin no. 80(diesel) & pin no. 44(petrol)) vehicle side connector to ESP CAN_L (pin no.2) vehicle side connector. 4. Read IVN DTCs in ABS/ESP in IGN ON condition Note: After rectification please give Ignition latch to heal the DTC.
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