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: 651 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.

P064C-13: Glow Plug Control Module 1 – Glow control unit feedback protocol error or open circuit of the

command

Overview:

DTC Description (User Friendly)

Glow control unit feedback protocol error or open circuit of the

command

ECU Pin Number

K057, K053, K054

Customer Symptom

No Symptoms, Glow Plug Lamp ON, Under Cold climates

(below 0 degrees C), Prolonged cranking of Engine happens.

Fault Effects (On Vehicle)

Under Cold climates (below 0 degrees C), Prolonged cranking

of Engine happens

Lamp Status (If Any)

Glow Plug Lamp Flashes

Fault Detection Condition (Root cause)

If Open circuit is detected at ECM pin K057 or GPIU Module

sends a data Transfer stop bit or flat line in the diagnostic

feedback line (K053 pin of EMS)

Normal Operating Condition

No Fault

Probable Trouble Area

Wiring Harness Connections between EMS ECU and GPIU

Module.

GPIU Module

EMS ECU

Healing Condition

Rectify the error

Clear through diagnostic tool

Ignition OFF & ON

Component Details:

Glow Plug Control Module controls the operation of Glow Plugs installed on each engine cylinder.

Glow Plug Module also provides feedback to EMS ECU regarding the activation status of glow plugs, failures in glow

plugs wiring connections / GPIU module itself. EMS ECU will take rectification actions, incase GPIU reports any errors.

Glow Plugs are installed on engine cylinders to warm up the engine cylinder chamber to aid the vehicle starting and

emission control under ambient temperatures below 0 degrees.

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 the wiring harness connections between EMS ECU and GPIU Module as per the circuit Schematic.

4. Loose/ Damaged Connections between GPIU Module and EMS ECU.

5. Loose/ Damaged Connections between GPIU Module and Battery supply or Main relay supply.

6. Check for proper installation of GPIU Module in Vehicle.

7. Check for damage of pins at EMS ECU connector and GPIU Module connector.

Trouble Shooting:

Step Checks

IF YES

IF NO

Check Whether the GPIU Module is installed on Vehicle

Go to Next Step

Fit GPIU Module

Check for any mechanical damage in GPIU Module

Call Hotline

Go to next step