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: 121 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.

P0577-15: Cruise Control Input Circuit High: Diagnostic fault check for SRC MAX error when analog key detection

is enabled

Overview:

DTC Description (User Friendly)

Cruise Control Input Circuit High: Diagnostic fault check for

SRC MAX error when analog key detection is enabled.

ECU Pin Number

K029 – Input analog signal to EMS

K033 – Ground signal to cruise button from EMS ECU

Customer Symptom

MIL OFF, CEL OFF

Fault Effects (On Vehicle)

Lamp Status (If Any)

Fault Detection Condition (Root cause)

SRC MAX error is detected if the raw signal voltage,

CrC_uRaw, exceeds the threshold threshold144 for a duration

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: