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: 124 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.

P0579-29: Cruise Control Multi-Function Input "A" Circuit Range/Performance: NPL error

Overview:

DTC Description (User Friendly)

Cruise Control Multi-Function Input "A" Circuit

Range/Performance : NPL error

ECU Pin Number

K029 – Input analog signal to EMS

K033 – Ground signal to cruise button from EMS ECU

Customer Symptom

MIL OFF, CEL ON

Fault Effects (On Vehicle)

Lamp Status (If Any)

CEL ON. CEL Turns Off as and when fault condition is not

present / healed.

Fault Detection Condition (Root cause)

NPL error is detected if the read in key status is equal to

CRC_SWT_INVALID for a duration 60000 ms or 50 ms.

Normal Operating Condition

Proper wire harness connection between Cruise Cncl button

and EMS ECU.

Probable Trouble Area

Wire harness connection between Cruise Cncl button and

EMS ECU.

Healing Condition

Rectify the error Clear through diagnostic tool.

Ignition OFF & ON

Component Details:

Cruise control is a system that automatically controls the

speed

of a

motor vehicle.

The system is a

servomechanism

that

takes over the

throttle o

f the car to maintain a steady speed as set by the driver.

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 wire harness connection between EMS and Cruise Cncl button.

4. Check for any back out of pins at EMS ECU connector.

5. Check for any damage of pins at EMS ECU connector.

Trouble Shooting: