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: 46 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. U0028-13:- Vehicle Communication Bus A-open circuit Overview: ISO Code U0028-13 Customer Symptom Engine cranking will not happen. Fault Effects (On Vehicle) Engine cranking will not happen. Lamp Status (If Any) N.A Fault Detection Condition This DTC will appear in case of following open circuit failures: 1 CANH wire open 2. CANL wire open 3. Both CANH,CANL open 4. Short circuit between 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 Reconnection of the CAN_H (connector pin 3) and CAN_L(connector pin 8)with the main CAN bus Trouble Shooting:-
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