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: 22 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. U3000 - 08:- Control Module - Bus Signal / Message Failures Overview: ISO Code U3000 - 08 Customer Symptom Unknown Fault Effects (On Vehicle) No effect Lamp Status (If Any) None Fault Detection Condition VICM monitors if VICM transmits all CAN frames correctly Normal Operating Condition Normal operating range: ECU will be awake from 6V to 16 V. Full assistance is b/w 11.5 to 16 volts. Reduced assistance is b/w 9 to 11.5 V Probable Trouble Area Internal Software lock. CAN transceiver fault Healing Condition N/A Component Details: Immobilizer system is designed to prevent vehicle theft by electronically disabling the engine starting system. The engine can be started only with vehicle’s original immobilizer ignition key, which has an electronic identification programmed code. Immobilizer unit is an add-on part on the ignition switch, fitted on the steering column. The engine can be started only with the vehicle’s original immobilizer ignition key. The electronic key communicates the identification code to ICU when the key is turned to the "Ignition ON" position. Preliminary Checks: 1. Voltage at the battery terminals should be greater than 11.5V. 2. VICM power supply connector should have greater than 11.5V for full assistance. 3. Check battery cable and VICM connector terminals for damage. 4. Check VICM ECU for pin bend/damage. 5. Alternator output voltage should be between 13.5 V to 14.5 V in engine running condition.
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