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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: 859 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.
P081B-12: Crank Inhibit Starter Relay Circuit High – Circuit Short to Battery
Overview:
ISO Code
P081B-12
Customer Symptom
Vehicle will not Start
Fault Effects (On Vehicle)
Vehicle will not Start
Lamp Status (If Any)
CE Lamp ON after 1 drive cycle
Fault Detection Condition
Ignition ON and Starter Relay-2 control pin of EMS ECU is short Circuited to
battery supply.
Normal Operating Condition
Wiring Harness connections as per Circuit schematic between EMS ECU and
Crank Inhibit relay, Relay Fully operational.
Probable Trouble Area
Improper Wiring Harness Connections, Starter Relay-2 Stuck Open
Healing Condition
After 1 Drive cycles and When Ignition is ON
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-2 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) Loose/ Damaged Connections between Starter Relay-2 and EMS ECU.
2) Loose/ Damaged Connections between Starter Relay-2 and Main relay supply or Starter Relay-2 & Starter
Solenoid.
3) Check for back out of pins at ECU connector.
4) Check for damage of pins at ECU connector.