HEXA

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ELECTRICAL
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8.14.2 IMMOBILIZER SYSTEM STATUS IN EMS ECU:
The information given in table below is the status of Immobilizer system in EMS & it can be accessed by
steps given below.
Steps
1. Connect the EMS ECU diagnostic tester to the Diagnostic connector in the vehicle
2. Start the communication
3. Go to “Engine parameter”
4. Select “Electronic key” and press “Start”
5. . The diagnostic tester will show the following
(A) This is valid for TATA Engine EMS ECU’s
Text indicted Condition Description Normal/ Abnormal
1
Immobilizer programmed in
EMS
-
EMS ECU software is
Immobilizer enabled
Normal
Virgin ECU - - Abnormal
2
Engine starting enabled
by EMS
Original E-Key in SCL Vehicle Ready to start Normal
Engine starting disabled
by EMS
No/wrong E-Key in SCL Vehicle will not start Abnormal
3
Immobilizer code
programmed in EMS but
not locked
Pairing operation not
done properly
AES key is written in to
EMS but not locked
Abnormal (displayed
only if exists)
4
Immobilizer code
programmed in EMS and
locked
Pairing operation OK
AES key is written in to
EMS and locked.
Normal
5 Fast restart inactive - - -
6
Key code OK /
Authentication OK
Successful authentication
& AES key is OK
AES key for EMS ECU &
Immobilizer are same
Normal
No Valid key detected/ bad
Authentication
Check the DTC code in
section
Vehicle will not start Abnormal
7 Free start inactive -
After pairing of EMS ECU
& Immobilizer, the free
starts are inactive
Normal
8
Immobilizer CAN
communication CAN
OFF/BUS OFF
Refer Immo CAN Section
CAN communication
error (bus off/mute)
Abnormal
Immobilizer CAN
communication OK
- - Normal