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: 242 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.

P0633-54: Immobilizer Key Not Programmed - ECM/PCM :MCU blank and free−starts exhausted

Overview:

DTC Description (User Friendly)

Immobilizer Key Not Programmed - ECM/PCM : MCU blank

and free−starts exhausted

ECU Pin Number

Customer Symptom

Vehicle cannot be started. MIL OFF, CEL OFF

Fault Effects (On Vehicle)

Vehicle cannot be started.

Lamp Status (If Any)

Immobilizer status lamp will come ON

Fault Detection Condition (Root cause)

This fault occurs when pairing process is not performed in

vehicle /EMS ECU is fresh & AES-key is not present in EMS.

MCU blank and free−starts exhausted

Normal Operating Condition

AES key is written successfully in EMS. Authentication

between EMS &Immo is successful

Probable Trouble Area

Immo pairing not done, EMS ECU.

Healing Condition

Perform Immo pairing, Turn Ignition Off and 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.

Trouble Shooting:

Step Checks

IF YES

IF NO

Perform immo pairing. Is immo pairing successful and

vehicle got cranked?

Confirm that fault is

rectified.

Call Hot line

DTC’s confirmation

(checks before handing over vehicle to customer)