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TIAGO/TIGOR AMT Gasoline
DTC Troubleshooting Guide
Version: 4.0
Date: 18-04-2017
Author: Sathi/Anupama
Page: 104 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.
31.
P2900 -01: Sport Switch input circuit – Switch Stuck
Overview:
ISO Code
P2900-01
Customer Symptom
Vehicle not shifting in sport mode or economy mode
Fault Effects (On Vehicle)
Vehicle not shifting in sport mode or economy mode
Lamp Status (If Any)
Transmission Fault Lamp OFF
Fault Detection Condition
This fault gets detected after Ignition On if TCU detects that
the Sport switch input is always in “pressed” state for a
timeout.
Normal Operating Condition
It is expected that the Sport switch input will not always be in
“pressed” condition.
Probable Trouble Area
Wiring Harness Connections / Gear Lever/TCU
Healing Condition
1000 milliseconds after valid sensor signal
Component Details:
Sport switch is a digital input from the Gear lever to the TCU. If the input is active, TCU changes the gear shift points to
introduce more sportiness in the drive.
Preliminary Checks:
1) Loose/ Damaged Gear Lever Connections.
2) Check for damage or back out of pins at TCU connector.
3) Check correct fitment of ground cable connections on vehicle chassis.
Trouble Shooting:-
Step Checks
IF YES
IF NO
1.
Is there any Pin backout/rust/oxidation
observed on TCU connectors?
Clean the Rust or repair or
replace
Go to Step 2
2
Check for correct mechanical operation of
the sport switch, ensure it properly returns
to its original position after being pressed
and released. Is it getting stuck sometimes?
Repair/Replace the Gear
lever
Go to Step 3
3
Check for continuity from TCU pin 7(28 pin
vehicle connector) to Gear lever pin 5, is
continuity OK?
Go to step 4
Ensure correct connection
as per schematic
4
Check for proper ground connection on
Gear lever Pin 4, is ground OK?
Go to step 5
Check and rectify
5
Check for any short circuit to ground/battery
with switch unpressed on Gear lever Pin 5,
is there any short?
Check and rectify/Replace
the lever if internal short
Go to step 6
6
Check for any short circuit to ground/battery
with switch unpressed on TCU Pin 7, is
there any short?
Check and rectify the
harness
Go to step 7
7
Is TCU power proper on TCU connector
pins 5, 1 and 3? Specifically check Ignition
supply toggling with key on/off.
Go to Step 8
Check and rectify harness
power connections.
8
With the lever connected and TCU
connector disconnected, check continuity of
TCU pin 77 with ground toggling with switch
press/release. Is continuity observed when
switch is pressed and not continuous when
released?
Replace the TCU
Replace the gear lever
DTC’s confirmation:-