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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: 748 of 1052
Copyright ©
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.
P245A-13: EGR cooler bypass control Circuit / Open Bank 1 – EGR high pressure cooler bypass command
(circuit open)
Overview:
DTC Description (User Friendly)
EGR high pressure cooler bypass command (circuit open)
ECU Pin Number
A069
Customer Symptom
Increased fuel consumption, Poor Engine performance, If
vehicle operated for long with fault, Engine components might
be damaged.
Fault Effects (On Vehicle)
Increased fuel consumption.
Lamp Status (If Any)
MIL OFF CEL OFF
Fault Detection Condition (Root cause)
ECM pin A069 Open circuited
Normal Operating Condition
No Fault
Probable Trouble Area
Wiring Harness connections btw EGR cooler by pass valve
pin 2 and ECM pin k090
EGR cooler bypass valve pin 1 not receiving 12 V supply
EGR Cooler by pass valve
EMS ECU faulty
Healing Condition
Rectify the error
Clear through diagnostic tool
Ignition OFF & ON
Component Details:
EGR cooler bypass valve is a solenoid valve, which controls the flow of EGR air through EGR
cooler based on EGR cooler load and Exhaust gas temperature. EMS ECU controls the valve opening from 0% to 100%
through PWM command to valve.
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. Loose/ Damaged Connections between EGR cooler by pass valve and EMS ECU.
4. Loose/ Damaged Connections between EGR cooler by pass valve and Main relay supply.
5. Check for damage of pins or back out of pins at ECU connector / EGR cooler by pass valve connector.
Trouble Shooting:
Step Checks
IF YES
IF NO
1
Check Whether the EGR cooler bypass valve is installed
on Vehicle
Go to Next Step
Fit EGR cooler
bypass valve
2
Check for any mechanical damage in EGR cooler bypass
valve
Replace EGR cooler
bypass valve
Go to next step
3
Is there wiring harness electrical continuity between ECU
pin A069 & valve pin 2. Also Check continuity between the
Main Relay supply and the valve pin 1.
Go to next step
Rectify the wiring
harness
connections as per
the circuit