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: 32 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.

P2135-62: Accelerator pedal potentiometer congruence (signal compare failure)

Overview:

DTC Description as per ISO standard

Accelerator pedal potentiometer congruence - signal compare

failure

ECU Pin Number

ECU pin A42, A40, A38

Customer Symptom

MIL Lamp ON

Fault Effects (On Vehicle)

Cruise control off, Torque limited, Particulate filter lamp,

Regen off, Engine may not start

Lamp Status (If Any)

MIL On

Fault Detection Condition (Root cause)

At ignition On

Normal Operating Condition

No Fault Code

Probable Trouble Area

1. Intake air temperature sensor (K76) short to supply

2. EGR position sensor supply (A40) short to supply

3. Turbo boost position sensor supply (A38) short to supply

4. Accelerator pedal signal pin k25,K27 short to supply.

5. EMS ECU

Healing Condition

Clear through diagnostic tool

Ignition OFF & ON

Component Details:

EMS ECU has two Internal 5 Volts power supplies. Power Supply 1 will provide input voltage to a group of sensors –

A. and Power Supply 2 will give input voltage to another group of Sensors-B..

Preliminary Checks:

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

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

Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to

earlier issue closure.

3. Check the connection of sensors powered by sensor supply Voltage 1. Follow sensor supply voltage1 check

/rectification process.

4. Check sensor connections for rust dirt etc; Follow rectification process of concerned sensor if faulty.

5. Check with diagnostic tool if the sensor supply voltage lies in between 4.75 V to 5.35 V.

6. Check ECU; Replace ECU, if problem still persists.

Trouble Shooting: