ERC, Chassis Engineering Prepared by : Sagar K Approved by: Bhavesh Raut P a g e | 108 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 U1306 - 87:- Lost Communication With Steering Angle Sensor Module (MTO) Overview: ISO Code U1306 – 87 Customer Symptom Warning Light Displayed Fault Effects (On Vehicle) ABS, HHC & EBD – Available, ESP & HDC – Not available Lamp Status (If Any) ABS – OFF, EBD – OFF, ESP – ON, HDC- ON, HHC-OFF Fault Detection Condition 1. SAS connector is not connected properly or disconnected from its location. 2. CAN wire from SAS connector side are disconnected 3. SAS VCC line fuse blown/disconnected. 4. CAN_H, CAN_L or both lines of SAS are open circuit Normal Operating Condition SAS communicates properly with TML diagnostic Tool. Probable Trouble Area 1. SAS connector / SAS fuse. 2. CAN lines of SAS Healing Condition 1. SAS is connected and no wiring harness issues from SAS side 2. CAN_H, CAN_L or both lines of SAS 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 SAS CAN_H (pin no 2) vehicle side connector to ESP vehicle side connector CAN_H (pin no 14) and SAS CAN_L (pin no1) 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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