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: 767 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.

P0261-11: Cylinder 1 Injector Circuit Low – Short circuit of the power stage low side (cylinder 1 error)

Overview:

DTC Description (User Friendly)

Short circuit of the power stage low side (cylinder 1 error)

ECU Pin Number

A85

Customer Symptom

Torque Limited, Cruise Control Off, MIL ON, Abnormal Engine

noise

Fault Effects (On Vehicle)

Reduced torque mode activated, Cruise control off, Abnormal

Engine noise

Lamp Status (If Any)

MIL ON

Fault Detection Condition (Root cause)

Short Circuit to Ground of EMS ECU pin A85.

Normal Operating Condition

From fault, normal operating condition will be achieved in the

next driving cycle if fault condition is no more present.

Probable Trouble Area

Wiring Harness connections between EMS ECU and Injector

cylinder 1

Injector Cylinder 1

EMS ECU

Healing Condition

Rectify the error

Clear through diagnostic tool

Ignition OFF & ON

Component Details:

Injector is used for, Metering and spray preparation of the diesel fuel, which is needed by the engine

according to the engine map. Realization of pilot and main injection, also post injection, if needed.

Controlling of injected quantity and injection timing, determined by system pressure and energizing time, actuated by the

ECU (Electronic Control Unit).

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 Cylinder 1 Injector as per the circuit Schematic.

4. Loose/ Damaged Connections between Cylinder 1 Injector and EMS ECU.

5. Check for damage of pins at EMS ECU connector and Injector connector.

Trouble Shooting:

Step Checks

IF YES

IF NO

Check for any mechanical damage in Cylinder 1 injector

Call Hotline

Go to next step

Is there wiring harness electrical continuity between ECU

pin A85 & Cylinder 1 Injector connector pin 2.

Go to next step

Rectify the wiring

harness

connections as per

the circuit

schematic.

Check whether the EMS pin A85 is short-circuited to

Battery / Ground.

Rectify the wiring

harness connections

Go to next step