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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: 524 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.
P2299: Accelerator Pedal - Stuck - Incorrect Correlation with Brake Pedal
Overview:
DTC Description as per ISO standard
Brake Pedal Position / Accelerator Pedal Position
Incompatible
ECU Pin Number
13, 39, 37 & 38
Customer Symptom
Engine restricted performance
No response from accelerator pedal
Fault Effects (On Vehicle)
Limp home activated
No pedal response
Lamp Status (If Any)
CEL ON
Fault Detection Condition
1) This DTC gets logged due to accelerator pedal & brake
pedal are pressed when the vehicle is more than 60 kmph for
a specified length of time.
2) Brake pedal setting is not correct
Normal Operating Condition
No vehicle acceleration when Accelerator pedal and brake
pedal are jointly pressed
Probable Trouble Area
Brake switch, EMS ECU, Accelerator pedal, APM sensors,
Grounding points, Wiring harness connections between APM
sensors and EMS ECU, Wiring harness connections btw
Brake switches and EMS ECU
Healing Condition
Clear the errors, Ignition OFF to ON
Component Details:
Accelerator pedal sensor:
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.
Brake Switches:
For safety reasons, Brake pedal is equipped with two Switches. These switches transition their states when the brake
pedal is pressed. EMS ecu uses the brake press information in its control strategies like Torque demand calculation, Gear
Shift indication, Accelerator pedal stuck detection, vehicle start function when clutch sensor fails etc.,
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
Check, if the Brake lights are on even when no brake pedal is pressed.
x
Check whether the accelerator pedal is free to move; Ensure free movement of the pedal; replace pedal if required.