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8.24.2 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 TATATIAGO1.05L CRAIL DIESEL engine EMS ECU’s
No.
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 8.20.10
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 Section 8.20.8
CAN communication
error (bus off/mute)
Abnormal
Immobilizer CAN
communication “OK”
-
-
Normal