NEXON DIAGNOSTIC MANUAL

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: 298 of 1203

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.

P0172-92: System Too Rich – Performance or Incorrect Operation

Overview:

ISO Code

P0172-92

Customer Symptom

Acceleration and Overall vehicle performance will be affected

Fault Effects (On Vehicle)

1. Too Rich fuel can heat of the engine as well as exhaust components.

2. Acceleration and overall vehicle performance is affected.

3. Lambda short term and long term adaptations will be switched off.

Lamp Status (If Any)

MIL ON after 3 drive cycles

Fault Detection Condition

This fault gets logged if the fuel content in the Air fuel mixture is higher than

required or air content is lower than required.

Normal Operating Condition

Air Fuel Mixture will be appropriate to the Torque and Emissions requirement.

Probable Trouble Area

Fuel Regulator/ Inlet metering valve stuck open, Injectors, Throttle valve stuck

Closed

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:

Preliminary Checks:

1. Excessive fuel supply

2. Bad Fuel Regulator / Inlet metering valve.

3. Throttle valve stuck Open

4. Injector delay time incorrect