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. PSCM DTC Troubleshooting Guide for Mando EPAS Version: 1.1 Date: 14/01/2019 Author: E&E Chassis - ERC Page53 U0028-88: CANBusOff Error Detected ISO Code U0028-88 Customer Symptom No warning lamp, No heavy steering Fault Effects (On Vehicle) Partial control at 80KPH Lamp Status (If Any) Warning lamp action dependent on IPC node ; G/Driver ON ; Motor ON Fault Detection Condition 1. Short circuit between following connections CAN_H -CAN_L, CAN_H -GND, CAN_L-Vbatt, CANL-GND, CANH-Vbatt 2. Open circuit failures as below, CAN_H or CAN_L connection open, CAN_H & CAN_L both open Normal Operating Condition ECU communicates properly with TML diagnostic Tool. Probable Trouble Area CAN_H and CAN_L wires Healing Condition 1. enableRxAndTx ($00) or enableTxAndDisableRx ($02) of CommunicationControl ($28) 2. Removal of the above-mentioned shorts/open in the wiring harness or at ECU pin. Component Details: NA Preliminary Checks: NA Trouble Shooting:
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