TIAGO/TIGOR AMT Gasoline DTC Troubleshooting Guide Version: 4.0 Date: 18-04-2017 Author: Sathi/Anupama Page: 152 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. 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 1. 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 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 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 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. 5 Fault Still Persists? Recheck the above steps Follow the steps again for reconfirmation 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 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:
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