TATA BSVI Gasoline_Bifuel Program – EMS ECU Bosch DTC Troubleshooting Service Manual Version: 2.6 Date: 5-10-2023 Prepared By: Pradip Shimpi Checked By: Yeshwant Jadhav Approved By: Sanjeev M. Document Part No: 2921 02 xxx xxxx Page: 800 of 1720 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) Sil 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.
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