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: 32 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. U3006 - 16:- Control Module Input Power "A"- circuit voltage below threshold Overview: ISO Code U3006 - 16 Customer Symptom None Fault Effects (On Vehicle) No VICM Functionality Lamp Status (If Any) None Fault Detection Condition If Battery(supply) voltage goes below 11.5V If Alternator is not charging the battery and alternator voltage is less than 13.5V or 0V. 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 Low voltage from fuse box, high resistance within supply line 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: 6. Voltage at the battery terminals should be greater than 11.5V. 7. VICM power supply connector should have greater than 11.5V for full assistance. 8. Check battery cable and VICM connector terminals for damage. 9. Check VICM ECU for pin bend/damage. 10. Alternator output voltage should be between 13.5 V to 14.5 V in engine running condition.
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