X2 Eagle ESP DTC Troubleshooting Data Version: 1.0 Date: 23-Oct-15 Author: ERC, Chassis E&E CoC Page: 176 of 224 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. U0028-88:- Vehicle Communication Bus A-Bus off Overview: ISO Code U0028-88 Customer Symptom All lamps of Instrument Cluster will be ON Fault Effects (On Vehicle) ABS – Available(without Drag torque control), EBD – Available, ESP – Not available Lamp Status (If Any) All lamps of Instrument Cluster will be ON Fault Detection Condition 1. Short circuit between CAN_H -CAN_L, CAN_H -GND, CAN_L-Vbatt, CANL-GND, CANH-Vbatt. Normal Operating Condition ECU communicates properly with TML diagnostic Tool. Probable Trouble Area CAN_H and CAN_L wires Healing Condition Removal of the above mentioned short circuit faults in the wiring harness or at ECU pin. 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/ESP in IGN ON condition Note: After rectification please give Ignition latch to heal the DTC.
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