ERC, Chassis Engineering Prepared by : Sagar K Approved by: Bhavesh Raut P a g e | 102 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 U0140 - 87:- Lost Communication With Body Control Module-Bus signal/Message Failure Overview: ISO Code U0140-87 Customer Symptom None Fault Effects (On Vehicle) ABS, EBD & ESP – Available, HDC – Not Available, HHC – Not available Lamp Status (If Any) ABS – OFF, EBD – OFF, ESP – OFF, HDC- ON, HHC-ON Fault Detection Condition 1. BCM connector is not connected properly or disconnected from its location. 2. CAN wire from BCM connector side are disconnected 3. BCM IGN & Battery fuse blown. 4. CAN_H, CAN_L or both lines of BCM are open circuit Normal Operating Condition BCM ECU communicates properly with TML diagnostic Tool. Probable Trouble Area 1. BCM connector / BCM fuse. 2. CAN lines of BCM ECU Healing Condition 1. BCM ECU is connected and no wiring harness issues from TCM side 2. CAN_H, CAN_L or/ and both lines of BCM 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 BCM CAN_H (pin no. 48) vehicle side connector to ESP CAN_H (pin no. 14) vehicle side connector and BCM CAN_L (pin no. 49) vehicle side connector to ESP CAN_L vehicle side connector (pin no.2) 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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