HARRIER BOOK 2

Q501 4 Cylinder MT Application

DTC Troubleshooting Data

Version: 0.1

Date: 21-Sep-2018

Prepared By: Mithi Prasad, Sarang Kulkarni, Manish Gupta

Checked By: Yogesh Jadhav

Approved By: Satish Kumar P

Page: 286 of 1052

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.

P112A-21: Lambda sensor upstream signal plausibility check (signal amplitude < minimum)

Overview:

DTC Description (User Friendly)

Lambda sensor upstream signal plausibility check (signal

amplitude < minimum)

ECU Pin Number

llCustomer Symptom

MIL ON, CEL OFF

Fault Effects (On Vehicle)

Lamp Status (If Any)

MIL ON. MIL Turns Off as and when fault condition is not

present / healed.

Fault Detection Condition (Root cause)

Measured oxygen concentration implausibly low compared to

model oxygen concentration for Sensor 1 Bank 1.

Normal Operating Condition

Proper wire harness connection between EMS ECU and

lambda sensor.

Probable Trouble Area

Wiring harness connections between lambda sensor and

EMS ECU.

Healing Condition

Rectify the error Clear through diagnostic tool.

Ignition OFF & ON

Component Details:

The O2 sensor is mounted in the exhaust manifold to monitor how much unburned oxygen is in the exhaust as the

exhaust exits the engine. Monitoring oxygen levels in the exhaust is a way of gauging the fuel mixture. It monitors fuel

mixture is burning rich (less oxygen) or lean (more oxygen).

Preliminary Checks:

1. Check whether the customer voice / view about the issue is matching with the fault effects mentioned in above

Table. If yes, go ahead with next steps. If not, check for other DTC’s presence.

2. Check whether other customers report similar complaints earlier. If yes, perform the preliminary checks with

respect to earlier issue closure.

3. Check for Damage in EMS ECU connector / Lambda sensor.

4. Check for any back out of pins at EMS ECU connector / Lambda sensor.

5. Check for any damage of pins at EMS ECU connector / Lambda sensor.

Trouble Shooting: