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: 938 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.

P1000-92: Performance limitation for High Fuel Temperature – Performance limitation for high fuel temperature

Overview:

DTC Description (User Friendly)

Performance limitation for high fuel temperature

ECU Pin Number

K045, K065

Customer Symptom

Torque Restriction

Fault Effects (On Vehicle)

Reduced torque mode active

Lamp Status (If Any)

MIL OFF, CEL OFF

Fault Detection Condition (Root cause)

Fuel Temperature information received from fuel temperature

sensor is greater than a threshold

Normal Operating Condition

No fault.

Probable Trouble Area

Driving Style

Fuel Level

WH connections btw fuel temperature sensor and EMS ECU.

Fuel temperature Sensor

EMS ECU

Healing Condition

Rectify the error

Clear through diagnostic tool

Ignition OFF & ON

Component Details:

Fuel temperature sensor is NTC resistor which resistance varies according to the fuel temperature

i.e. the resistance will decrease as the fuel temperature increase. Vehicle's fuel temperature sensor is the component that

tells your engine control unit (ECU) to adjust the amount of fuel it injects. When your fuel is warm, it is less dense and it

burns more quickly. On the other hand, when fuel is cold fuel, it is denser and burns slower.

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 wiring harness dis-continuities between the fuel temperature sensor and EMS ECU.

4. Poor Driving style leading to fuel temperature rise.

Trouble Shooting:

Step Checks

IF YES

IF NO

Check the Wiring Harness connections between EMS ECU

and fuel temperature sensors as per the schematic. Found

ok?

Go to next step

Rectify the wiring

harness

connections

Observe the driving style of driver. Found abnormal?

Ask him to drive

normally

Go to next step

Fault Persists?

Replace Fuel Temp.

sensor

Go to Next step

Fault Persists?

Call Hotline

Repeat the above

steps for re-

confirmation