TIAGO

TIAGO AMT Gasoline

DTC Troubleshooting Guide

Version: 2.0

Date: 06-06-2016

Author: Sathi/Anupama

Page: 333 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.

111.

P184D- 01: Electro valves Driver 2 Thermal warning

Overview:

ISO Code

P184D- 01

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 Electro valve

drivers report a thermal warning to the TCU.

Normal Operating Condition

Electro valve drivers report a normal functioning to the TCU.

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

After re

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.