TIAGO/TIGOR AMT Gasoline DTC Troubleshooting Guide Version: 4.0 Date: 18-04-2017 Author: Sathi/Anupama Page: 149 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. 46. P0716 -01: Vehicle speed input – Signal Wrong Overview: ISO Code P0716-02 Customer Symptom 1. While running, if VSS fault comes, vehicle will remain in same gear and will retain that gear till it comes to halt. 2. If vehicle launch in the same ignition cycle, then launch will be allowed in the same gear (in which fault has come). This is applicable to up to 2nd gear. If fault has comes in/above 3rd gear then launch will not be allowed. 3. After power latch, in next ignition cycle, user can crank the vehicle and transmission will try 5thgear first and then subsequent gears (4-3-2-1).With sustainable speed, clutch closed and error gets confirmed and vehicle will retain that gear. 4. Reverse gear is not allowed Fault Effects (On Vehicle) 1. While running, if VSS fault comes, vehicle will remain in same gear and will retain that gear till it comes to halt. 2. If vehicle launch in the same ignition cycle, then launch will be allowed in the same gear (in which fault has come). This is applicable to up to 2nd gear. If fault has comes in/above 3rd gear then launch will not be allowed. 3. After power latch, in next ignition cycle, user can crank the vehicle and transmission will try 5thgear first and then subsequent gears (4-3-2-1).With sustainable speed, clutch closed and error gets confirmed and vehicle will retain that gear. 4. Reverse gear is not allowed Lamp Status (If Any) Transmission Fault Lamp ON Fault Detection Condition This fault gets detected if (Instrument cluster sends signals to TCU) Vehicle speed information on CAN is invalid. Normal Operating Condition Instrument cluster sends signals to TCU that vehicle speed information on CAN is valid. Probable Trouble Area Wiring Harness Connections / Instrument Cluster/ TCU Healing Condition 2000 milliseconds after valid sensor signal Component Details: Vehicle speed sensor is connected to the Instrument cluster and calculated vehicle speed values are transmitted via CAN bus to the TCU. Preliminary Checks: 7) Loose/ Damaged vehicle speed sensor Connections. 8) Check for damage or back out of pins at Instrument cluster and vehicle sensor connector. 9) 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 sensor connectors? Clean the Rust or repair or replace Go to Step 2 2. Diagnose the vehicle speed sensor connection inputs to IC (Refer Instrument cluster service manual), is there a problem with any vehicle sensor connection? Ensure correct connection of vehicle speed sensor inputs to Instrument cluster 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.
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