X2 Eagle ABS DTC Troubleshooting Data Version: 1.0 Date: 03-Dec-15 Author: ERC, Chassis E&E CoC Page: 129 of 154 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. U0028-13:- Vehicle Communication Bus A-open circuit Overview: ISO Code U0028-13 Customer Symptom NA Fault Effects (On Vehicle) ABS – Available(without Drag torque control), EBD – Available Lamp Status (If Any) ABS – OFF, EBD – OFF Fault Detection Condition This DTC will appear in case of following open circuit failures: 1 CANH wire open (pin 26) 2. CANL wire open(pin 14) 3. Both CANH,CANL open Normal Operating Condition ECU communicates properly with TML diagnostic Tool. Probable Trouble Area CAN_H and CAN_L wires Healing Condition Reconnection of the CAN_H (connector pin 26) and CAN_L(connector pin14)with the main CAN bus Preliminary Check: 1. Check resistance in Diagnostic CAN pin no. 6 and 14. It should be 120 Ω. 2. Check for short conditions between CAN_H (pin no. 26)-CAN_L (pin no. 14), CAN_H (pin no. 26)-GND (pin no. 13), CAN_L (pin no. 14)-GND (pin no. 13), CAN_H (pin no. 26)-Vbatt (pin no. 1) and CAN_L (pin no. 14)-GND (pin no. 13). There should not be any short circuit conditions. 3. 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). 4. Read IVN DTCs in ABS in IGN ON condition Note: After rectification please give Ignition latch to heal the DTC.
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