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TIAGO/TIGOR AMT Gasoline
DTC Troubleshooting Guide
Version: 4.0
Date: 18-04-2017
Author: Sathi/Anupama
Page: 140 of 427
Copyright ©
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
1.
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
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
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.
4
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
DTC’s confirmation:-
After rectification, clear all DTC’s and ensure 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: