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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: 992 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.
P2176-84: Throttle Actuator Control System – Idle Position Not Learned – Signal Below Allowable
Range
Overview:
ISO Code
P2176-84
Customer Symptom
1)ETC Control will Not be active.
2)Vehicle /Engine speed will be limited for safety concerns
Fault Effects (On Vehicle)
1)ETC Control will Not be active.
2)Vehicle /Engine speed will be limited for safety concerns
Lamp Status (If Any)
MIL ON after 1 drive cycle
Fault Detection Condition
This fault gets logged if the throttle actuator is stuck closed / Blocked due to
throttle idle position not learning properly.
Normal Operating Condition
Throttle actuator functions as per design
Probable Trouble Area
Throttle Actuator Valve
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. Pls. check whether dust/mud/any particle is blocking throttle valve.
2. Pls. check whether the throttle valve is stuck closed
3. Pls. check for any throttle body related faults and rectify those faults by following their rectification procedure.