ERC, Chassis Engineering Prepared by : Sagar K Approved by: Bhavesh Raut Page | 111 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 U1313-87:- Lost communication with Transmission Control Unit- Bus signal/Message Failure Overview: ISO Code U1313-87 Customer Symptom Warning Light Displayed Fault Effects (On Vehicle) ABS, EBD – Available, ESP – Not Available, HHC&HDCDepends on fault type Lamp Status (If Any) ABS – OFF, EBD – OFF, ESP – OFF, HHC & HDC(Depends on fault type) Fault Detection Condition 1. TCU connector is not connected properly or disconnected from its location. 2. CAN wire from TCU connector side are disconnected 3. TCU line fuse blown/disconnected. 4. CAN_H, CAN_L or both lines of TCU are open circuit Normal Operating Condition TCU communicates properly with TML diagnostic Tool. Probable Trouble Area 1. TCU connector / TCU fuse. 2. CAN lines of TCU Healing Condition 1. TCU is connected and no wiring harness issues from TCU side 2. CAN_H, CAN_L or both lines of TCU 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 TCU CAN_H (pin no. 25) vehicle side connector to ESP vehicle side connector CAN_H (pin no 14) and TCU CAN_L (pin no. 28) vehicle side connector to ESP vehicle side connector CAN_L(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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