TATA BSVI Gasoline_Bifuel Program – EMS ECU Bosch DTC Troubleshooting Service Manual Version: 1.9 Date: 24-01-2022 Prepared By: Veer K. Singh / Prudhvi B Varma Checked By: Yeshwant Jadhav Approved By: Sanjeev M. Document Part No: 2921 02 xxx xxxx Page: 592 of 1692 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. P0504-2F: Brake switch “A/B” Correlation – Signal Erratic Overview: ISO Code P0504-2F Customer Symptom 1) Break light switch will not switch on, when breaks pressed, 2) BOA function will not work. Fault Effects (On Vehicle) Brake Light Lamp / Stop lamp function might get effected Break light switch will not switch on, when breaks pressed Lamp Status (If Any) SIL Lamp ON after 1 drive cycle Fault Detection Condition This fault gets logged only when Brake pedal is pressed and EMS finds no correlation between the brake main and Redundant switches input after calibrated threshold. Normal Operating Condition EMS ECU finds plausibility between Brake Switches input Probable Trouble Area Wiring harness Connections between Brake Switches and EMS ECU, Improper Brake Switch Setting Healing Condition After 1 Drive cycle 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: For safety reasons, Brake pedal is equipped with two Switches. These switches transition their states when the brake pedal is pressed. Preliminary Checks: 1) Loose/ Damaged Connections between Brake Switch pins and EMS ECU. 2) Check for back out of pins at ECU connector. 3) Check for damage of pins at ECU connector. 4) Check for damage of Brake switch connector.
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