TIAGO

TIAGO AMT Gasoline

DTC Troubleshooting Guide

Version: 2.0

Date: 06-06-2016

Author: Sathi/Anupama

Page: 86 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.

26.

P0825 -02: Gear Lever Sensor Circuit Signal Not valid

Overview:

ISO Code

P0825-02

Customer Symptom

Transmission Fault Lamp ON,

Creeping inactive,

Transmission going automatically to neutral from gear when

coming to halt after drive.

Vehicle not cranking

Fault Effects (On Vehicle)

Creeping inactive,

Transmission going automatically to neutral from gear when

coming to halt after drive.

Vehicle not cranking

Lamp Status (If Any)

Transmission Fault Lamp ON

Fault Detection Condition

This fault gets detected after Ignition On if the decoded

position of the lever from the 4 GSL signals is not a valid

combination.

Normal Operating Condition

The decoded positions form a valid combination.

Probable Trouble Area

Wiring Harness Connections / Sensor / TCU

Healing Condition

1500 milliseconds after valid sensor signal

Component Details:

The Gear Lever outputs four hall sensor signals which encode the position of the Gear lever.

Preliminary Checks:

1) Loose/ Damaged Connections between Sensors and TCU.

2) Check for damage or back out of pins at Gear lever connector and TCU connector.

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

4) Check mechanical operation of gear shift lever (latching at each position R/N/A/M), specifically check for play or

looseness in lever operation.

Trouble Shooting:-

Step Checks

IF YES

IF NO

Is there any rust/oxidation observed on

Sensor Terminals (GSL connector)

Clean the Rust or repair or

replace

Go to Step 2

Is there wiring harness electrical continuity

between TCU pins to GSL Lever connector

pins.

Go to Step 3

Establish continuity by

rectifying harness

connections as per the

circuit schematic

3. Are there any pins damaged at GSL lever

connector or TCU Connector

Replace the connector or

wiring harness.

Go to step 4

Are there any pins backed out from the GSL

lever or TCU Connector

Rectify/Replace Connectors Go to Step 5

Are any GSL Sensor Signal Pins Short

circuited to GND/Battery? Check for inter-

short among themselves also. (check pins 17,

15, 13 and 11 at TCU 28 pin connector)

Repair the harness as per

the schematic

Go to Step6

Check Ignition and ground connections on

Lever connector (pin 3 and pin 1 respectively

on lever 6pin connector), are they OK?

Go to Step 7

Repair the harness as

per the schematic

Fault Still Persists?

Replace GSL lever, if fault

persists Replace TCU

Follow the steps again

for reconfirmation