TIAGO

TIAGO AMT Gasoline

DTC Troubleshooting Guide

Version: 2.0

Date: 06-06-2016

Author: Sathi/Anupama

Page: 312 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.

99.

P0604- 08: TCU ROM Checksum Error *

*This particular fault may not be detectable with the diagnostic tool as TCU will fail to run.

Overview:

ISO Code

P0604- 08

Customer Symptom

No gearshifts ,

Vehicle not cranking,

Fault Effects (On Vehicle)

No gearshifts ,

Vehicle not cranking,

Lamp Status (If Any)

Transmission Fault Lamp ON (may not be possible to

observe)

Fault Detection Condition

This fault gets detected during TCU power OFF, if a ROM

checksum error is detected by TCU

Normal Operating Condition

ROM /RAM/Flash memory checksum integrity is valid during

Power OFF

Probable Trouble Area

TCU damage

Healing Condition

Immediately after detection of valid ROM checksum integrity

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

Connect the diagnostic tool and check

connection status to TCU. Is the TCU

responding?

Clear the DTC and do Ignition

key ON/OFF with full power

latch (20 sec). Repeat for 5

times.

Repeat step 1,

If TCU communicates, clear

the fault, test drive the vehicle

through all gears and release

to customer after final drive

test.

Go to Step 2

Check Battery and Ignition supplies at pins

1,3and 5 respectively. Both are correct?

Go to Step 4

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 Step 4

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

Ensure no DTC is active and Transmission Fault Lamp is OFF.