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TIAGO/TIGOR AMT Gasoline
DTC Troubleshooting Guide
Version: 4.0
Date: 18-04-2017
Author: Sathi/Anupama
Page: 11 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.
2.
P0914-01: Gear Position Sensor Circuit– Fixed Signal Low Level
Overview:
ISO Code
P0914-01
Customer Symptom
Transmission Fault Lamp ON,
Jerky Gearshifts,
Transmission going automatically to neutral while driving.
No gearshift (if shift position sensor is also faulty)
Fault Effects (On Vehicle)
Jerky Gearshifts,
Transmission going automatically to neutral while driving.
No gearshift (if shift position sensor is also faulty)
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 low value (no edges) of
the signal is detected for a timeout.
Normal Operating
Condition
Gear Position signal will be in a valid range corresponding to the total travel of
the gear engage actuators (both odd and even). Signal has valid period and duty
cycle.
Probable Trouble Area
Loose mechanical fitment of TCU/ Sensor loose/damage/short (internal)/ TCU
internal damage
Healing Condition
1000 milliseconds after valid sensor signal
Component Details:
The Gear Position sensor is PWM type sensor which outputs a signal duty cycle in proportion to the gear engage actuator
position.
Preliminary Checks:
1) If this DTC occurs in combination with DTC P1853, refer remedy for P1853.
2) Loose/ Damaged mechanical fitments of TCU (TCU to kit mounting).
3) Check for any visible damage to TCU.
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.
Unmount and remove the TCU from the valve
body. Inspect the condition of the gear position
sensor (refer fig below). Is the sensor visibly
undamaged?
Go to Step 2
Replace the sensor/TCU.
2.
Inspect the sensor connection to TCU main
board for loose fit/disconnection/pin damage. Is
the sensor connected properly?
Go to Step 3
Fit the sensor back
properly.
If sensor connector
damage then replace the
TCU.
3. 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.