HARRIER BOOK 2

Q501 4 Cylinder MT Application

DTC Troubleshooting Data

Version: 0.1

Date: 21-Sep-2018

Prepared By: Mithi Prasad, Sarang Kulkarni, Manish Gupta

Checked By: Yogesh Jadhav

Approved By: Satish Kumar P

Page: 977 of 1052

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.

P2299-2A: Brake Pedal Position / Accelerator Pedal Position Incompatible – Brake and accelerator pedal

coherence

Overview:

DTC Description (User Friendly)

Brake and accelerator pedal coherence

ECU Pin Number

K041, K025, K024, K07, K027, K026, K035, K010

Customer Symptom

Vehicle may accelerate even with Brake Press.

Fault Effects (On Vehicle)

Unintended Acceleration, Accelerator pedal / Brake pedal

may not move freely.

Lamp Status (If Any)

MIL OFF, CEL OFF

Fault Detection Condition (Root cause)

When Brake is pressed (EMS ECU Brake switch input active)

& Engine Speed > 520 RPM and Vehicle Speed > 10 KMPH

then fault gets logged.

Normal Operating Condition

No Fault Code

Probable Trouble Area

Accelerator pedal stuck / Brake pedal stuck / EMS ECU

Brake Switch input WH faulty, Accelerator Pedal sensor input

to EMS ECU faulty / Accelerator Pedal Sensor / Brake

Switches / EMS ECU

Healing Condition

Rectify the error

Clear through diagnostic tool

Ignition OFF & ON

Component Details:

For safety reasons, the accelerator pedal sensor is equipped with 2 resistors (potentiometers) with varying operating

ranges (~2.23 – ~ 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.

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:

1. 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.

2. Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to

earlier issue closure.

3. Check with User whether he has a habit of driving vehicle with Accelerator Pedal and Brake Pedal simultaneous

press.

4. Check for any other faults presence related to ECU Internal power supplies; Follow rectification process for those

faults, before proceeding further.

Check whether the Accelerator and Brake Pedals are moving freely. Else look for Mechanical issues and correct

them.

6. Check whether any other faults related to Accelerator pedal sensors / Brake switches are present. If yes, rectify

them by following their rectification procedure.

7. Check for Wiring Dis-continuity between Accelerator Pedal Sensor & EMS ECU. If found, fix them