HARRIER BOOK 2

Q501 4 Cylinder MT Application

DTC Troubleshooting Data

Version: 0.1

Date: 21-Sep-2018

Prepared By: Mithi Prasad, Sarang Kulkarni, Manish Gupta

Checked By: Yogesh Jadhav

Approved By: Satish Kumar P

Page: 239 of 1052

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.

P0513-86: Incorrect Immobilizer Key: Bad ICU authentication

Overview:

DTC Description (User Friendly)

Incorrect Immobilizer Key: Bad ICU authentication

ECU Pin Number

Customer Symptom

Vehicle cannot be started.

Fault Effects (On Vehicle)

Vehicle cannot be started.

Lamp Status (If Any)

Immobilizer status lamp will come ON. MIL and CEL off.

Fault Detection Condition (Root cause)

Bad ICU authentication

This fault occurs when AES-Key is not programmed correctly

in either EMS or VICM ECU

Normal Operating Condition

Authentication between EMS &Immo is successful.

Probable Trouble Area

AES key not programmed correctly either in EMS / Immo,

ImmoUnit, EMS ECU.

Healing Condition

After Successful Immo Pairing, In the same Ignition cycle if

EMS / Immo hasn’t entered anti scanning mode.

After Successful Immo pairing, give a power latch of 20 secs

and turn the Ignition ON.

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 (ICU) 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.

Engine will allow the Vehicle cranking only if the authentication between EMS and IMMO is successful and Transponder /

Key used for cranking is paired to the Immobilizer unit.

Preliminary Checks:

1. Check whether the customer voice / view about the issue is matching with the fault effects mentioned in above

Table. If yes, go ahead with next steps. If not, check for other DTC’s presence.

2. Check whether other customers report similar complaints earlier. If yes, perform the preliminary checks with

respect to earlier issue closure.

3. Check whether the Immo telltale in the instrument cluster is turned ON. If not, confirm that vehicle starting issue is

not related to Immobilizer.

4. Check whether the ignition is turned On with correct transponder key.

5. Read Immo status from the diagnostic tool, Immo status shall be – ‘Authentication between EMS and IMMO failed

/ Bad authentication’ && Engine starting disabled by EMS. If Immo status is not as above, then vehicle not startingissue is

not related to Immobilizer.

Trouble Shooting: