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: 23 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.

P0123-12: Accelerator pedal potentiometer 1 (circuit short to battery)

Overview:

DTC Description as per ISO standard

Accelerator pedal potentiometer 1- circuit short to battery.

ECU Pin Number

Accelerator pedal potentiometer pin

K41,K25,K24,K07,K27,K26

Customer Symptom

MIL Lamp ON

Fault Effects (On Vehicle)

Engine torque limitation

Lamp Status (If Any)

MIL On

Fault Detection Condition (Root cause)

At ignition On accelerator pedal pressed

Normal Operating Condition

No Fault Code

Probable Trouble Area

1. Accelerator pedal position sensor 1 supply open circuit.

2. Accelerator pedal position sensor 1 signal short to supply.

3. Accelerator pedal position sensor 1 ground short to supply.

4. Accelerator pedal position sensor 1 ground open circuit

5. Accelerator pedal sensor.

6. EMS ECU

Healing Condition

Clear through diagnostic tool

Ignition OFF & ON

Component Details:

For safety reasons, the accelerator pedal sensor is equipped with 2 resistors (potentiometers) with varying operating

ranges (0.75 – 4.45 V and 0.38 – 2.23 V) and separate circuits. A potentiometer informally a pot, is a three- terminal

resistor with a sliding contact that forms an adjustable voltage divider. If only two terminals are used, one end and the

Wiper, it acts as a variable resistor or rheostat. Based on the Accelerator pedal position, Engine will produce the driver

demanded torque based on the accelerator pedal position

Preliminary Checks:

•

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.

•

Check for Reference voltage 2 fault (P0642, P0643) if present; Follow Reference voltage2(sensor supply

•

voltage2) check and rectification Procedure, to correct this fault before proceeding further

•

Check the pedal connector connected to the pedal sensor/ module.

•

Check sensor connections for rust dirt etc; clean the sensor connections and ensure proper fitment.

•

Check Intermediate connector; Remove Intermediate connector between EMS harness and vehicle wiring

harness. Check for terminal back out. Do necessary repairs, then reconnect and check the fault.

•

Visually check sensor; Replace sensor if damaged.