TIAGO

TIAGO AMT Gasoline

DTC Troubleshooting Guide

Version: 2.0

Date: 06-06-2016

Author: Sathi/Anupama

Page: 358 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.

123.

P185B -07: Clutch Stroke Selftuning Error

Overview:

ISO Code

P185B-07

Customer Symptom

Transmission Fault Lamp ON,

No gearshifts ,

Vehicle not picking up

Fault Effects (On Vehicle)

No gearshifts ,

Vehicle not picking up

Lamp Status (If Any)

Transmission Fault Lamp ON

Fault Detection Condition

This fault gets detected after Ignition On during a Grid

selftuning procedure or during normal operation if TCU

detects that the Clutch stroke service procedure is not done

or not successfully completed

Normal Operating Condition

Clutch Stroke selftuning Procedure is successfully completed

at End of line or after service part replacements(refer service

manual) that require such procedure.

Probable Trouble Area

Clutch assembly

Healing Condition

Immediately after detection of valid Selftuning procedure

completion.

Component Details:

Clutch Stroke selftuning procedure is automatically performed by TCU when Grid selftuning procedure is requested through a

diagnostic or End of line tool, it is required by the TCU to learn the total range of travel of the clutch between its end positions.

Preliminary Checks:

1) Before proceeding with rectification, ensure no other DTC in TCU except from a set of P1844, P080A, and P185B. If

2) Before re-initiating the procedure check the following conditions:

a> Ignition key is ON

b> Transmission in neutral

c> Healthy battery

d> Engine speed is 0

e> Vehicle speed is 0

f> Check correct hydraulic pressure with diagnostic tool (38-51 bar)

g> Brake is not pressed

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

4) Visibly check for damage/mis-assembly of clutch actuator/components

5) Visibly check for any damage to kit/oil leakage/other kit components.

6) Check for loose fitting TCU/EMS/ and clutch position sensor connectors

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

Trouble Shooting:-

Step Checks

IF YES

IF NO

Connect the TCU diagnostic tool and

the current one?

procedure again.

Recheck from step 1

Go to Step 2

Initiate the Grid selftuning procedure with

the diagnostic tool, wait for ~ 2 minutes

and ask for routine result.

Is grid selftuning procedure successfully

executed?

Go to Step 3

If Grid selflearning

failed with error code

Go to Step 4

If other error codes

refer DTC P1844