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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: 233 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.
P0123-12: Throttle/Pedal Position Sensor/Switch “A” Circuit High– Circuit Short to Battery
Overview:
ISO Code
P0123-12
Customer Symptom
Vehicle /Engine speed will be restricted
Fault Effects (On Vehicle)
1. Vehicle runs with calibratable speed limitation.
Lamp Status (If Any)
MIL ON after 1 drive cycle
Fault Detection Condition
This fault gets logged if the throttle position Sensor signal pin 203 is short
Circuited to battery
Normal Operating Condition
Throttle actuator functions as per design
Probable Trouble Area
Throttle Actuator and position Sensor ,wiring harness connections, EMS ECU
Healing Condition
After 3 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:
A DC motor drive is used to move the throttle valve over the complete movement range. The DC motor is directly
controlled by the ECU of the Gasoline engine. Throttle Valve H-bridge driver of EMS ECU provides bidirectional
control with active recirculation and over current detection.
Preliminary Checks:
1. Check whether dust/mud/any particle is blocking throttle valve.
2. Check whether the throttle valve is stuck closed
3. Check for any throttle body related faults and rectify those faults by following their rectification procedure.