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TIAGO/TIGOR AMT Gasoline
DTC Troubleshooting Guide
Version: 4.0
Date: 18-04-2017
Author: Sathi/Anupama
Page: 56 of 427
Copyright ©
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.
17.
P0805-04: Clutch Position Sensor Circuit– PWM Duty low
Overview:
ISO Code
P0805-04
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 the signal duty cycle is
found to be lower than acceptable threshold.
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
Sensor damage (internal)/ 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
1.
Replace the clutch position sensor (refer fig
below). Is the problem rectified?
Check for confirmation
steps
Replace the TCU
DTC’s confirmation:-
After rectification, clear all DTC’s and ensure 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.
Circuit Schematic Diagram: