TIAGO

TIAGO AMT Gasoline

DTC Troubleshooting Guide

Version: 2.0

Date: 06-06-2016

Author: Sathi/Anupama

Page: 47 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.

14.

P0805-01: Clutch Position Sensor Circuit Fixed Signal low Level

Overview:

ISO Code

P0805-01

Customer Symptom

Transmission Fault Lamp ON,

Loss of power while driving.

Engine not cranking

Engine stalling at low vehicle speeds

No gearshift

Fault Effects (On Vehicle)

Transmission going automatically to neutral while driving.

Engine not cranking

Engine stalling at low vehicle speeds

No gearshift

No EOL self-tuning.

Lamp Status (If Any)

Transmission Fault Lamp ON

Fault Detection Condition

This fault gets detected after Ignition On when the Engine is not cranking and

Sensor & battery Supply voltage is in proper range and a low value (no edges)

of the signal is detected for a timeout.

Normal Operating

Condition

Clutch Position signal will be in a valid range corresponding to the total travel of

the Clutch actuator between fully open and closed positions. Signal has valid

period and duty cycle.

Probable Trouble Area

Harness or connector damage/short, Sensor loose/damage/short, TCU internal

damage

Healing Condition

50 milliseconds after valid sensor signal

Component Details:

The Clutch Position sensor is PWM type sensor which outputs a signal duty cycle in proportion to the Clutch actuator position.

Preliminary Checks:

1) If this DTC occurs in combination with DTC P1852, refer remedy for P1852.

2) Loose/ Damaged TCU system connector (12 pin).

3) Check for any visible damage to TCU pins, clutch sensor and its pins.

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

Trouble Shooting:-

On first occurrence, clear the DTC and drive the vehicle for 2-3 kms, read the DTC again. On fault confirmed again, follow

below steps.

Step Checks

IF YES

IF NO

Is there any rust/oxidation/pin back out

observed on 12 pin system connector pins 1, 8

&12.

Clean the Rust or repair

or replace

Go to Step 2

Is there wiring harness electrical continuity

between 12 pin system connector pins 1,8

&12.to

Sensor connector pins 2,1 &3?

Go to Step 3

Establish continuity by

rectifying harness

connections as per the

circuit schematic

3. Are there any pins damaged at Sensor

Connector?

Replace the system

wiring harness.

Go to step 4

Are any Sensor Signal Pins Short circuited to

GND/Battery?

Repair the harness as per

the schematic

Go to Step 5

Fault Still Persists?

Replace Sensor, if fault

persists ReplaceTCU

Follow the steps again for

reconfirmation