TIAGO

TIAGO AMT Gasoline

DTC Troubleshooting Guide

Version: 2.0

Date: 06-06-2016

Author: Sathi/Anupama

Page: 140 of 424

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.

43.

P0710 -02: Engine Water Temperature Signal not valid

Overview:

ISO Code

P0710-02

Customer Symptom

Limp Home mode is active, Gear shift allowed upto 2nd gear.

jerky/sluggish gear shifting

Fault Effects (On Vehicle)

Limp Home mode is active, Gear shift allowed upto 2nd gear.

jerky/sluggish gear shifting

Lamp Status (If Any)

Transmission Fault Lamp OFF

Fault Detection Condition

This fault gets detected after Ignition On if EMS signals the

TCU that Engine coolant information on CAN is invalid.

Normal Operating Condition

EMS signals the TCU that engine coolant information on

CAN is valid

Probable Trouble Area

Wiring Harness Connections / EMS / TCU

Healing Condition

2000 milliseconds after valid sensor signal

Component Details:

Engine water temperature signal is transmitted via CAN bus to the TCU.

Preliminary Checks:

1) Loose/ Damaged Engine coolant sensor Connections.

2) Check for damage or back out of pins at EMS connector and TCU connector.

3) Check correct fitment of ground cable connections on vehicle chassis.

Trouble Shooting:-

Step Checks

IF YES

IF NO

Is there any rust/oxidation observed on EMS

or TCU or Engine coolant Sensor

connectors?

Clean the Rust or repair or

replace

Go to Step 2

Diagnose the engine coolant sensor input to

EMS (Refer EMS service manual), is there a

problem with Engine coolant sensor or

sensor to EMS connection?

Ensure correct connection of

Engine coolant sensor input

to EMS as per EMS service

manual.

Go to step 3

Is TCU power connections on TCU

connector pins 5, 1, 3? Specifically check

Ignition supply toggling with key on/off.

Go to Step 4

Check and rectify

harness power

connections.

Connect the EMS diagnostic tool and check

the value of Engine coolant temperature with

engine OFF and then running, are correct

values observed?

Follow the steps again for

reconfirmation

Recheck the above

steps

the following points by referring TCU parameters using TML diagnostic tool

before handing over to customer.

After key ON with TML TCU diagnostic tool connected, monitor the engine water temperature and confirm that it

changes when Engine OFF to Engine running condition and represents plausible values.

Drive the vehicle through all gears in both Automatic and Manual modes

Ensure no DTC is active and Transmission Fault Lamp is OFF.

Circuit Schematic Diagram: