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TIAGO AMT Gasoline
DTC Troubleshooting Guide
Version: 2.0
Date: 06-06-2016
Author: Sathi/Anupama Page: 143 of 424
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.
44. P0716 -02: Vehicle speed input Signal not valid
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 2 nd 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 2 nd 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:
1) Loose/ Damaged vehicle speed sensor Connections.
2) Check for damage or back out of pins at Instrument cluster and vehicle sensor 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 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.