TIGOR AMT

TIAGO/TIGOR AMT Gasoline

DTC Troubleshooting Guide

Version: 4.0

Date: 18-04-2017

Author: Sathi/Anupama

Page: 261 of 427

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.

82.

P2909-02: Gearbox System –Shift Locked

Overview:

ISO Code

P2909-02

Customer Symptom

No gearshifts,

Vehicle not picking up,

vehicle stuck in gear while driving

Fault Effects (On Vehicle)

No gearshifts,

Vehicle not picking up ,

vehicle stuck in gear while driving

Lamp Status (If Any)

Transmission Fault Lamp OFF

Fault Detection Condition

This fault gets detected after Ignition On during a gearshift

when TCU detects that the rank shifting failed to complete

within a timeout

Normal Operating Condition

TCU monitors rank engagement during a gearshift

Probable Trouble Area

Gear Electro valve / TCU / Gearbox

Healing Condition

Fault is cleared on next ignition Power ON

Component Details:

In an AMT system, the gear shifting is actuated through 3 electrovalves viz. 2 gear electrovalves for shifting between odd and

even gears and 1 shift electrovalves for shifting between ranks.

Preliminary Checks:

1) Loose/ Damaged Valve body and TCU mountings.

2) Check for damage or back out of pins at TCU connector.

3) Check visibly for kit Oil leakage and ensure with diagnostic tool that kit oil pressure is in range 38 - 51 bar

4) Check for mechanical damage to the Valve body (MGA), kit and gearbox mechanical fitments

5) Check correct fitment of ground cable connections on vehicle chassis.

Trouble Shooting:-

At first occurrence of this DTC, clear the DTC and drive the vehicle through all gears for ~5 kms, on repeat occurrence of this

DTC check the following.

Step Checks

IF YES

IF NO

Through the TML diagnostic tool, Read the

Parameters

1)“Sure Engage Threshold EV ON/OFF”

2)”Shift position Threshold”

Compare the values to the nominal values

and tolerances below:

:xx mm

:yy mm

Are the read values correct within tolerance

limits?

Go to Step 2

Perform a Grid learning

procedure through the

TML diagnostic tool, Rerun

the vehicle through the

drive test.

Check the kit & gearbox assembly for

mechanical damage, stuck gear actuator,

synchro ring damage, fork damage, gear

damage, lubrication etc?

Go to Step 3

Rectify/replace the

gearbox

Check gear electrovalves electrical

connections by following same procedure

as for DTC’s – P0750 & P0755, Are

electrical connections OK?

Go to Step 4

Establish continuity by

rectifying harness

connections as per the

circuit schematic