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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: 294 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.
P0171-92: System Too Lean – Performance or Incorrect Operation
Overview:
ISO Code
P0171-92
Customer Symptom
Acceleration and Overall vehicle performance will be affected
Fault Effects (On Vehicle)
1. Too lean fuel can heat up the engine as well as exhaust components.
2. Acceleration and overall vehicle performance will be affected.
3. Lambda short and long term adaptations will be disabled.
Lamp Status (If Any)
MIL ON after 3 drive cycles
Fault Detection Condition
This fault gets logged if the Air content in the Air fuel mixture is higher than
required or fuel content is lower than required.
Normal Operating Condition
Air Fuel Mixture will be appropriate to the Torque and Emissions requirement.
Probable Trouble Area
Fuel Line, Fuel Regulator, Injectors, Air Intake Circuit, throttle valve
Healing Condition
Vehicle running and 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:
NA
Preliminary Checks:
1. Blocked Fuel Line
2. Bad Fuel Regulator
3. Blocked/Leaking Injectors
4. Intake Air Circuit Leakage.
5. Injector delay time not correct
6. Throttle valve stuck Open
7. Fuel pump relay stuck closed