TIAGO

TIAGO AMT Gasoline

DTC Troubleshooting Guide

Version: 2.0

Date: 06-06-2016

Author: Sathi/Anupama

Page: 152 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.

47.

P0710 -03: External Temperature Signal not valid

Overview:

ISO Code

P0710-03

Customer Symptom

jerky/sluggish gear shifting

Fault Effects (On Vehicle)

jerky/sluggish gear shifting

Lamp Status (If Any)

Transmission Fault Lamp OFF

Fault Detection Condition

This fault gets detected after Ignition On if Instrument cluster

signals the TCU that external temperature information on

CAN is invalid.

Normal Operating Condition

Instrument cluster signals the TCU that external temperature

information on CAN is valid.

Probable Trouble Area

Wiring Harness Connections / Instrument Cluster/ TCU

Healing Condition

2000 milliseconds after valid sensor signal

Component Details:

External temperature Sensor is used to measure ambient air temperature, it is connected to Instrument cluster and

temperature value is transmitted via CAN bus to the TCU.

Preliminary Checks:

1) Loose/ Damaged External temperature sensor Connections.

2) Check for damage or back out of pins at Instrument cluster 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 Instrument

cluster or TCU or external temperature Sensor

connectors?

Clean the Rust or repair

or replace

Go to Step 2

Is there any deposit/coating on the external

temperature sensor (mud /sludge etc.)?

Clean the deposits or

repair or replace

Go to Step 3

Diagnose the external temperature sensor input to

Instrument cluster (Refer Instrument cluster

service manual), is there a problem with external

temperature sensor or sensor to Instrument

cluster connection?

Ensure correct

connection of external

temperature sensor input

to instrument cluster as

per instrument cluster

service manual.

Go to step 4

Is TCU power connections on TCU connector pins

5, 1, 3? Specifically check Ignition supply toggling

with key on/off.

Go to Step 5

Check and rectify

harness power

connections.

Fault Still Persists?

Recheck the above steps Follow the steps again

for reconfirmation

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 external temperature and confirm that it

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: