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: 741 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.

P0625-11: Alternator -Generator Field/F Terminal Circuit Low– Circuit Short to Ground

Overview:

ISO Code

P0625-11

Customer Symptom

Vehicle start and battery charging while driving may get

affected.No

Limphome-

switch ON the service lamp

Fault Effects (On Vehicle)

Vehicle start and battery Charging while driving may get affected

Lamp Status (If Any)

CE lamp ON after 3 drive cycle

Fault Detection Condition

This fault gets logged if the DF Signal EMS ECU pin is short circuited to ground

Normal Operating Condition

Plausible DF signal from Alternator / Healthy Wiring harness Connections

between EMS ECU and Alternator Terminal -

Probable Trouble Area

Alternator Faulty, Wiring Harness Connections

Healing Condition

At Engine Running and after 1 drive cycle of Fault rectification

Fault Permanent Deletion

1. Clear DTC Command form Scan tool

2. Stack Over Flow.

3. 40 warm up cycles.

4. ECU Flashing.

5. ECU Power-Fail

Component Details:

Alternator DF signal gives the Current Electrical loadon vehicle – information to EMS ECU. Based on which, EMS

ECU calculates, how much additional torque to be developed for Alternator to deliver the load.

Preliminary Checks:

1) Loose/ Damaged Connections between Alternator Terminal –

and EMS ECU.

2) Check for back out of pins at both Alternator Terminal –

and ECU connector.

3) Check for damage of pins at both Alternator Terminal -

and ECU connector.

4) Check the continuity from Alternator Terminal -

to the ECU pin.

5) Alternator Functional?