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TIAGO/TIGOR AMT Gasoline
DTC Troubleshooting Guide
Version: 4.0
Date: 18-04-2017
Author: Sathi/Anupama
Page: 119 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.
36.
P2903 -02: Accelerator Pedal Position– Signal not valid
Overview:
ISO Code
P2903-02
Customer Symptom
Automatic gear shift disabled, no gearshift.
Fault Effects (On Vehicle)
Automatic gear shift disabled, (creep will active)
No gearshift.
Lamp Status (If Any)
Transmission Fault Lamp OFF
Fault Detection Condition
This fault gets detected after Ignition On if EMS signals the
TCU that accelerator pedal information on CAN is invalid.
Normal Operating Condition
EMS signals the TCU that accelerator pedal information on
CAN is valid
Probable Trouble Area
Wiring Harness Connections / EMS / TCU
Healing Condition
200 milliseconds after valid sensor signal
Component Details:
Accelerator pedal position signal is transmitted via CAN bus to the TCU.
Preliminary Checks:
1) Loose/ Damaged Accelerator pedal sensor Connections.
2) Check for damage or back out of pins at EMS connector and 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 rust/oxidation observed on EMS
or TCU connectors?
Clean the Rust or repair or
replace
Go to Step 2
2
Diagnose the Accelerator pedal input to EMS
(Refer EMS service manual), is there a
problem with accelerator pedal sensor or
sensor to EMS connection?
Ensure correct connection
of accelerator pedal sensor
input to EMS as per EMS
service manual.
Go to step 3
3
Is TCU power connections on TCU
connector pins 5, 1, 3? Specifically check
Ignition supply toggling with key on/off.
Go to Step 4
Check and rectify harness
power connections.
4
Connect the EMS diagnostic tool and check
the value of accelerator pedal position with
pressed and unpressed pedal, are correct
values observed?
Replace the TCU
Go to Step 5
5
Fault Still Persists?
Recheck the above steps
Follow the steps again for
reconfirmation
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.
After key and engine ON with TML TCU diagnostic tool connected, monitor the accelerator pedal and confirm that it
changes from about 0% un-pressed to about 100% when pressed fully.
Drive the vehicle through all gears in both Automatic and Manual modes and