Kanger 2.0 iVBAC DTC Troubleshooting data Version: 1.0 Date: 31-March-22 Author: ERC, Chassis CoC This document must not be used in any way, such as copying and redistributing to third parties, without the consent of author. Copyright © TATA MOTORS Ltd. P a g e | 266 U1320-08 :- Lost Communication With VCU - Bus Signal / Message Failure Overview: ISO Code U1320-08 Customer Symptom Warning Light Displayed Fault Effects (On Vehicle) EBD– Available, ABS- Degraded Function ESC, HDC, AVH, HHC & APB – Not Available Lamp Status (If Any) ABS &BEBD – OFF ESC, HDC, AVH, HHC & APB – ON Fault Detection Condition VCU ECU CAN communication Normal Operating Condition VCU ECU communicates with TML diagnostics tool Probable Trouble Area VCU ECU communication with vehicle CAN network Healing Condition Fault rectification/ Short circuit removal Preliminary Check: 1. Check resistance in Diagnostic CAN pin no. 6 and 14. It should be 120 ohm. 2. Check CAN connection of VCU ECU with vehicle network, There should not be any short circuit conditions. 3. Check for short conditions at I VBAC ECU 46 pin connector between CAN_H (pin no. 4)-CAN_L (pin no. 5), CAN_H (pin no. 4)-GND (pin no. 14&46 ), CAN_L (pin no. 5)-GND (pin no.14 &46), CAN_H (pin no.4)-Vbatt (pin no.1) and CAN_L (pin no.5)-GND (pin no. 14 & 46). There should not be any short circuit conditions. 4. Check continuity between IPC CAN_H (pin no. 8) vehicle side connector to OBD connector CAN_H (pin no. 6) and CAN_L (pin no. 7) vehicle side connector to ODB connector (pin no.14) 5. Read IVN DTCs in I VBAC in IGN ON condition. Note: After rectification please give Ignition latch to heal the DTC.
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