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: 37 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.

P0531-11: A/C Refrigerant Pressure Sensor "A" Circuit Range/ Performance: Indicates an error when the

compressor pressure is not sufficient

Overview:

DTC Description (User Friendly)

A/C Refrigerant Pressure Sensor "A" Circuit Range/

Performance: Indicates an error when the compressor

pressure is not sufficient.

ECU Pin Number

A043 – 5V supply to A/C Refrigerant pressure sensor

A044 – Input analog signal to EMS ECU.

A048 – Gnd signal to A/C Refrigerant pressure sensor

Customer Symptom

MIL OFF, CEL OFF

Fault Effects (On Vehicle)

Lamp Status (If Any)

Fault Detection Condition (Root cause)

Detects an error if the compressor pressure is not

enough.The diagnosis is done after a 0 ms time. This allows

pressure to build up and avoids false diagnostic fault.

Normal Operating Condition

Proper Wiring harness connections between EMS and AC

pressureSensor.

Probable Trouble Area

Wiring harness connections between EMS and AC pressure

Sensor. AC pipes damaged, AC gas not filled in, EMS ECU.

Healing Condition

Rectify the error Clear through diagnostic tool.

Ignition OFF & ON

Component Details:

The air conditioning system is pressurized with a gas known as a refrigerant. The refrigerant flows through the lines in the

air conditioning system to remove heat and moisture from the interior of your vehicle. It circulates it through the

condenser, which disperses the heat into the air. The refrigerant is pressurized in the air conditioning system to operate

properly, and it is monitored by the refrigerant pressure sensor. Based on the AC refrigerant pressure, EMS controls the

AC Compressor and Cooling Fans.

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 / A/C Refrigerant pressure sensor.

4. Check for any back out of pins at EMS ECU connector / A/C Refrigerant pressure sensor.

5. Check for any damage of pins at EMS ECU connector / A/C Refrigerant pressure sensor.

Trouble Shooting: