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: 1013 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.

P2187-92: System Too Lean at Idle – Performance or Incorrect Operation

Overview:

ISO Code

P2187-92

Customer Symptom

1. Affect idle stability.

2. Affect performance in Low engine speed and load zones.

Fault Effects (On Vehicle)

1. Affect idle stability.

2. Affect performance in Low engine speed and load zones.

Lamp Status (If Any)

MIL ON after 3 drive cycles

Fault Detection Condition

This fault gets logged if at idle condition, air content in the air fuel ratio is

higher than required or Fuel content in the air fuel ration is less than

required. Otherwise, Oxygen Sensors detect too much oxygen content in the

exhaust gas.

Normal Operating Condition

Air Fuel Mixture will be appropriate as per the Torque and Emissions

requirement.

Probable Trouble Area

Fuel Line, Fuel Regulator, Injectors, Air Intake Circuit, throttle valve

Healing Condition

Engine 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. 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