ERC, Chassis Engineering Prepared by : Sagar K Approved by: Bhavesh Raut P a g e | 97 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 U0046-88:- Vehicle Communication Bus A-Bus off Overview: ISO Code U0046-88 Customer Symptom All lamps of Instrument Cluster will be ON Fault Effects (On Vehicle) ABS – Available, EBD – Available, ESP – Not available, HDC– Not available, HHC– 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. 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 IPC CAN_H (pin no. 6) vehicle side connector to OBD connector CAN_H (pin no. 14) and CAN_L (pin no 5) vehicle side connector to ODB connector (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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