1077 / 5157
Nexon Gasoline – EMS ECU Bosch
DTC Troubleshooting Manual
Version: 0.1
Date: 26-08-2017
Prepared By: Sunu S Babu/Yogesh Jadhav
Checked By: Yeshwant Jadhav
Approved By: Satish Kumar
Document Part No: 2921 02 224 A1736
Page: 1073 of 1203
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.
P2299-94: Brake Pedal Position/Accelerator Pedal Position Incompatible– Unexpected Operation
Overview:
ISO Code
P2299-94
Customer Symptom
1. Engine restricted performance
2. No response from accelerator pedal
Fault Effects (On Vehicle)
1. Limp home activated
2. No pedal response
Lamp Status (If Any)
CE Lamp ON after 3 drive cycle
Fault Detection Condition
1. This DTC gets logged due to accelerator pedal &
brake pedal are pressed when the vehicle is more
than a calibrated value 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, Grounding
points, Wiring harness connections btw Brake switches and
EMS ECU, Wiring harness connections btw Accelerator Pedal
sensor and EMS ECU
Healing Condition
After 1 Drive cycles
Fault permanent deletion
1. Clear DTC Command form Scan tool
2. Stack Over Flow.
3. 40 warm up cycles.
4. ECU flashing
5. ECU Power-Fail
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:
1) Loose/ Damaged Connections between Brake Switch pins and EMS ECU.
2) Loose/ Damaged Connections between Accelerator Pedal Sensor and EMS ECU
3) Check for back out of pins at ECU connector.
4) Check for damage of pins at ECU connector.
5) Check for damage of Brake switch connector.
6) Check for back out of pins at both Accelerator Pedal Sensor connector and ECU connector.
7) Check the continuity from Accelerator Pedal Sensor connector pins to the ECU pins.
8) Check the continuity Brake switch connector pins to the ECU pins.