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Nexon Gasoline – EMS ECU Bosch
DTC Troubleshooting Manual
Version: 0.1
Date: 26-08-2017
Prepared By: Sunu S Babu/Yogesh Jadhav
Checked By: Yeshwant Jadhav
Approved By: Satish Kumar
Document Part No: 2921 02 224 A1736
Page: 1098 of 1203
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.
P3003-71: Welded Contact at StarterRelay – Actuator Stuck
Overview:
ISO Code
P3003-71
Customer Symptom
Vehicle will not Start
Fault Effects (On Vehicle)
Vehicle crank inhibited for 10 sec
Lamp Status (If Any)
CE Lamp ON after 3 drive cycles
Fault Detection Condition
Ignition ON and starter relay contacts are welded or Starter relay contact pin
X shorted to battery.
Normal Operating Condition
Starter Control Circuit wiring harness connections as per the schematic,
Relay Fully operational.
Probable Trouble Area
Improper Wiring Harness Connections for starter control Circuit, Starter relay
Stuck closed
Healing Condition
After 1 Drive cycles
Fault permanent deletion
1. Clear DTC Command form Scan tool
2. Stack Over Flow.
3. 40 warm up cycles.
4.ECU flashing
5. ECU Power-Fail
Component Details:
Starter Relay is a normally Open relay. It is an electrically controlled switch. By energizing the coil of the relay, its
contacts get closed.
Preliminary Checks:
1) Starter relay contacts welded.
2) Loose/ Damaged Connections between Starter Relay and EMS ecu.
3) Loose/ Damaged Connections between Starter Relay coil pin X and Main relay supply or Starter relay contact
pin X & Battery supply or Starter relay contact pin X and Starter Relay-2 Contact pin X.
4) Check for back out of pins at ECU connector.
5) Check for damage of pins at ECU connector.