4859 / 4910
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: 16 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.
B1639-06: Vehicle immobilizer control Module EMS-Immo handshake failed
Overview:
ISO Code
B1639-06
DTC simple description
EMS-Immobilizer communication failure
Customer Symptom
Vehicle cannot be started.
Fault Effects (On Vehicle)
Vehicle cannot be started.
Lamp Status (If Any)
Immo status lamp On
Fault Detection Condition
At ignition On
Normal Operating Condition
Authentication between EMS & Immo is successful
Probable Trouble Area
EMS ECU, Immobilizer
Healing Condition
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.
Pairing of EMS & immobilizer.
Trouble Shooting:-
Step Checks
IF YES
IF NO
1
EMS & Immobilizer connection
Go to next step
Connect it properly
2
Replace the EMS ECU
Go to next step 3
3
Pair EMS ECU & immo with TML tool.
Check the vehicle starting after pairing
Stop
Go to step 4
4
Replace the immobilizer
Go to step 3
DTC’s confirmation:-
Check the status of immobilizer in EMS ECU.
Start the EMS ECU diagnostic tool
Go to Engine parameter
Select the electronic key
The Status of immobilizer should be as follows:
Immo code programmed in EMS
Engine starting enable
Valid keys detected & Authentication successful
CAN communication Ok