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TIAGO/TIGOR AMT Gasoline
DTC Troubleshooting Guide
Version: 4.0
Date: 18-04-2017
Author: Sathi/Anupama
Page: 236 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.
75.
P2904-03: Clutch System – Overheat
Overview:
ISO Code
P2904-03
Customer Symptom
Buzzer ON,
Transmission Fault Lamp ON,
Earlier/late upshifts/downshifts,
Jerky / sluggish gear shifting.
Fault Effects (On Vehicle)
Earlier/late up shifts/downshifts,
Jerky / sluggish gear shifting.
Lamp Status (If Any)
Transmission Fault Lamp ON
Fault Detection Condition
This fault gets detected after Ignition On if clutch temperature
is found to be greater than a threshold.
Normal Operating Condition
TCU detects clutch temperature in a valid range
Probable Trouble Area
Wiring Harness Connections / Electro valve / TCU / Clutch
Healing Condition
500ms after fault is healed
Component Details:
In an AMT system, the clutch is electro-hydraulically controlled by the TCU. Clutch can become overheated if the vehicle is
creeping for very long or if held on up slope using only accelerator pedal and in other cases where there is prolonged clutch
slippage.
Preliminary Checks:
1) Loose/ Damaged Valve body and TCU mountings.
2) Check for damage or back out of pins at TCU connector.
3) Check visibly for kit Oil leakage and ensure with diagnostic tool that kit oil pressure is in range 38 - 51 bar
4) Check for mechanical damage to the clutch housing, clutch actuator mechanical fitments
5) Check correct fitment of ground cable connections on vehicle chassis.
Trouble Shooting:-
At first occurrence of this DTC, clear the DTC and drive the vehicle through creeping for 10 minutes, pickup and slow drive
~10 kph in 1
st
gear for 10 minutes and through all gears for 2-3 kms. At the repeat occurrence follow the below steps.
Step Checks
IF YES
IF NO
1.
Check the clutch assembly and AMT clutch
lever interface for mechanical damage,
stuck particle, lubrication loss etc?
Go to Step 2
Rectify/replace the clutch
2.
Check for worn out clutch and excessive
slippage. Using the diagnostic tool check
the clutch wear index. Is the clutch wear
high?
Replace the clutch and
initiate clutch learning
procedure(refer Secxx).
Drive the vehicle for yy kms
and release to customer
after final drive check.
Go to Step 3
3.
Check clutch electrovalve electrical
connections by following same procedure
as for DTC – P0900. Are electrical
connections OK?
Go to Step 4
Establish continuity by
rectifying harness
connections as per the
circuit schematic
4.
Check the Connections of the External
temperature Sensor (refer procedure for
DTC P0710 -04), are sensor connections
OK?
Go to step 5
Rectify the connections
ensure correct sensor
operation (refer DTC
P0710-04).
5.
Check the Connections of the Engine water
temperature Sensor (refer procedure for
Go to step 6
Rectify the connections
ensure correct sensor