Immobilizer –DTC Troubleshooting Data Version: 1.2 Date:03-June-2014 Prepared Author: Sarang K/Mithipati P Review & approved by: R A Rode (ERC-E&E) Page: 49 of 67 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. Inspection Method: - N.A U0028-88:- Vehicle Communication Bus A-Bus off Overview: ISO Code U0028-88 Customer Symptom All lamps of Instrument Cluster will be ON, Engine cranking will not happen. Fault Effects (On Vehicle) Engine cranking will not happen. 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. 2. In case of following open circuit failures: 1 CANH wire open(Vehicle connector pin 3) 2. CANL wire open(Vehicle connector pin 8) 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 Removal of the above mentioned shorts/open in the wiring harness or at ECU pin.
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