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TIAGO/TIGOR AMT Gasoline
DTC Troubleshooting Guide
Version: 4.0
Date: 18-04-2017
Author: Sathi/Anupama
Page: 233 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.
74.
P2904-02: Clutch System – Closing during Engage
Overview:
ISO Code
P2904-02
Customer Symptom
No gearshifts,
Sudden shift to neutral while driving
Fault Effects (On Vehicle)
No gearshifts,
Sudden shift to neutral while driving
Lamp Status (If Any)
Transmission Fault Lamp OFF
Fault Detection Condition
This fault gets detected after Ignition On during a gearshift
when clutch is found to be closing without commanded close.
Normal Operating Condition
TCU detects correct clutch response during clutch opening for
gearshift
Probable Trouble Area
Clutch Electro valve / TCU / Clutch
Healing Condition
Fault is cleared on next successful gear shift
Component Details:
In an AMT system, the clutch is electro-hydraulically controlled by the TCU.
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:-
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
component
2.
Check clutch electrovalve electrical
connections by following same procedure
as for DTC – P0900. Are electrical
connections OK?
Go to Step 3
Establish continuity by
rectifying harness
connections as per the
circuit schematic
3.
Using TCU diagnostic tool, initiate clutch
actuation routine.Monitor “clutch position
Actuator” Variable and confirm that it
changes from engaged (~xxx mm) to
disengaged (yyy mm) position.
(Alternately visibly check the clutch lever
movement with actuation command.)
Is the clutch engaging and disengaging
freely?
Recheck the above steps
Replace the valve body
(Mechatronic gear
Actuator),
if fault persists then
Replace Kit
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: