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: 475 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.

P0069-21: Turbocharger pressure and atmospheric pressure plausibility

Overview:

DTC Description as per ISO standard

Turbocharger pressure and atmospheric pressure plausibility -

Signal Amplitude > Minimum

ECU Pin Number

A38,A61,A95,A96

Customer Symptom

MIL ON

Fault Effects (On Vehicle)

Cruise Control shut off;

Torque limitation

Intake manifold pressure to default value

Boost pressure shut off

Regeneration by driver demand inhibition;

Service regeneration inhibition

Regeneration due to flow resistance is disabled;

DPF regeneration interruption or prevention

Lamp Status (If Any)

MIL ON

Fault Detection Condition (Root cause)

Turbocharge pressure sensor WH.

EMS ECU

Turbocharger

Normal Operating Condition

No Fault Code

Probable Trouble Area

Boost pressure related electrical failure.

Boost pressure sensor

EMS ECU

Healing Condition

Clear through diagnostic tool

Ignition OFF & ON

Component Details:

Boost pressure sensor consists of a silicon chip mounted inside a reference chamber. On one side of the chip is the

Reference chamber and on the other side is the pressure to be measured. The electrical resistance of the chip varies with

the variation of pressure. This change in resistance alters the voltage signal. ECM interprets the voltage signal as

Pressure and any change in voltage signal change in pressure.

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.

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

earlier issue closure.

3. Inlet Air Circuit Clogging?

4. VGT Actuator faulty?

5. Turbo charger Faulty?

6. Loose/ Damaged Connections between Boost Pressure Sensor and EMS ECU.

7. Check for back out of pins at both Boost Pressure Sensor connector and ECU connector.

8. Check for damage of pins at both Boost Pressure sensor connector and ECU connector.

9. Atmospheric pressure sensor faulty?

Trouble Shooting: