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:
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