NEXON DIAGNOSTIC MANUAL

Nexon Gasoline – EMS ECU Bosch

DTC Troubleshooting Manual

Version: 0.1

Date: 26-08-2017

Prepared By: Sunu S Babu/Yogesh Jadhav

Checked By: Yeshwant Jadhav

Approved By: Satish Kumar

Document Part No: 2921 02 224 A1736

Page: 777 of 1203

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.

P0633-04: Immobilizer Key Not Programmed – ECM/PCM– System Internal Failures

Overview:

ISO Code

P0633-04

Customer Symptom

Vehicle will not start, starter will not engage.

Fault Effects (On Vehicle)

Vehicle will not start, starter will not engage.

Lamp Status (If Any)

Immo Lamp ON

Fault Detection Condition

Fault gets logged if the AES key is not written into EMS ecu.

Incase EMS ecu is replaced & no pairing operation is carried out, then this

DTC will log in.

Normal Operating Condition

Same AES key & VIN will be written into both EMS and Immo.

Probable Trouble Area

EMS ecu

Healing Condition

After 1 drive cycle of fault rectification

Fault Permanent deletion

Stack Over flow

After 40 drive cycles of fault rectification.

Diagnostic command to clear DTC’s

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 (VICM) 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

immobilizer (VICM) when the key is turned to the "Ignition ON" position.

Immobilizer comes with two Electronic keys (E-key)

Preliminary Checks:

Check whether VIN is written into EMS ecu and it is matching with VIN of Immo..