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OSPREY- Application
DTC Troubleshooting Data
Version: 4.0
Date: 10-02-2017
Prepared by: Mithipati Prasad
Checked by: G S Raju / Senthilnathan S
Page: 344 of 654
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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.
P1121: Accelerator Pedal Sensor Fault (Triggers Reduced Torque Mode)
Overview:
DTC Description as per ISO standard
Accelerator Pedal sensor fault
ECU Pin Number
37, 38
Customer Symptom
Engine performance will be restricted
Fault Effects (On Vehicle)
Reduced torque mode will be activated by EMS
Lamp Status (If Any)
CE Lamp is on
Fault Detection Condition
1. This DTC is set as a consequence of other pedal related
faults P 0122, P0123, P0222, P0223, P2135
Normal Operating Condition
Diagnostic tool display the value of accelerator pedal pressed
in % at ignition ON condition
Probable Trouble Area
Accelerator Pedal sensor
Related wiring Harness, connector or terminals
ECU
Component Details:
For safety reasons, the accelerator pedal sensor is equipped with 2 resistors (potentiometers) with varying operating
ranges (0.75
–
4.45 V and 0.38
–
2.23 V) and separate circuits. A potentiometer informally a pot, is a three- terminal
resistor with a sliding contact that forms an adjustable voltage divider. If only two terminals are used, one end and the
wiper, it acts as a variable resistor or rheostat. Based on the Accelerator pedal position, Engine will produce the driver
demanded torque based on the accelerator pedal position.
Preliminary Checks:
x
Check whether the customer voice / view about the issue is matching with the fault effects mentioned above. If
yes, go ahead with next steps. If not, check for other DTC’s presence.
x
Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to
earlier issue closure.
x
Follow the rectification procedure of P 0122, P0123, P0222, P0223, and P2135; whichever is present. P1121 will
vanish once all these DTC's are rectified.
Trouble Shooting:
Step Checks
IF YES
IF NO
1.
Are any of the faults - P 0122, P0123, P0222, P0223,
P2135 present?
Rectify them by
following their
rectification
procedure
Go to Step 2
2
Fault Still Persists?
Replace Sensor and
then Fault still
persists then call hot
line
Follow the steps
again for
reconfirmation