TIAGO

TIAGO AMT Gasoline

DTC Troubleshooting Guide

Version: 2.0

Date: 06-06-2016

Author: Sathi/Anupama

Page: 134 of 424

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.

41.

P2907 -02: Engine Maximum Torque Signal not valid

Overview:

ISO Code

P2907-02

Customer Symptom

Jerky or sluggish gearshifts

Fault Effects (On Vehicle)

Jerky or sluggish gearshifts

Lamp Status (If Any)

Transmission Fault Lamp OFF

Fault Detection Condition

This fault gets detected after Ignition On if EMS signals the

TCU that generated torque information on CAN is invalid.

Normal Operating Condition

EMS signals the TCU that generated torque information on

CAN is valid

Probable Trouble Area

Wiring Harness Connections / EMS / TCU

Healing Condition

200 milliseconds after valid sensor signal

Component Details:

Maximum engine torque signal is transmitted via CAN bus to the TCU. In case of this particular DTC being set, it is expected

that an EMS component is at fault.

Preliminary Checks:

1) Loose/ Damaged EMS sensor/actuator 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

Is there any rust/oxidation observed on

EMS or TCU connectors?

Clean the Rust or repair or

replace

Go to Step 2

2 Check with the EMS diagnostic tool, are

EMS (Refer EMS service

manual)

Go to step 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.

Fault Still Persists?

Recheck the above steps

Follow the steps again for

reconfirmation

After rectification, clear all D

the following points by referring TCU parameters using TML diagnostic tool

before handing over to customer.

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:-