TIAGO

TIAGO AMT Gasoline

DTC Troubleshooting Guide

Version: 2.0

Date: 06-06-2016

Author: Sathi/Anupama

Page: 327 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.

108.

P0701- 03: Electro valves Driver 1 Device closed

Overview:

ISO Code

P0701- 03

Customer Symptom

Transmission Fault Lamp ON,

No gearshifts ,

Vehicle not cranking,

Vehicle not picking up,

sudden shift to neutral while driving, engine stopping,

gear shift request by lever disabled

Fault Effects (On Vehicle)

No gearshifts ,

Vehicle not cranking,

Vehicle not picking up,

sudden shift to neutral while driving,engine stopping,

gear shift request by lever disabled

Lamp Status (If Any)

Transmission Fault Lamp ON

Fault Detection Condition

This fault gets detected after Ignition On if the TCU detects

that the requested clutch current is lesser than a threshold

and the feedback voltage from the clutch driver is greater than

a threshold.

Normal Operating Condition

Feedback voltage from the clutch driver is lesser than a

threshold if the clutch is not commanded.

Probable Trouble Area

TCU damage

Healing Condition

50 milliseconds after valid signal

Component Details:

The Problem may occur due to an internal damage to TCU.

Preliminary Checks:

1) Battery voltage

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

3) Check correct fitment of ground cable connections on vehicle chassis (tightness, corrosion of mounting bolts etc.)

Trouble Shooting:-

Step Checks

IF YES

IF NO

At the first instance of the fault, clear the

DTC and run the vehicle in all gears for

about 10 kms, does the fault recur?

Go to Step 2

Release the vehicle to the

customer after final drive

test

Check Battery and Ignition supplies at pins

1,3and 5 respectively. Both are correct?

Go to Step 3

rectify harness

connections as per the

circuit schematic

Is there any pin back

out/damage/rust/oxidation observed on

TCU Connector?

Clean or repair or replace

connector

Go to Step4

Fault Still Persists?

Replace TCU

Follow the steps again for

reconfirmation

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