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: 1671 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. U0155-81 : Plausibility check for Com_stParkBrkSts2 Overview: ISO Code U0155-81 Customer Symptom RESS Feature not working. Fault Effects (On Vehicle) RESS Feature will be disabled Lamp Status (If Any) NO Lamp Fault Detection Condition The invalid DTC shall be logged when the signal becomes implausible. Normal Operating Condition ECU and IPC are communicating properly. Probable Trouble Area CAN messages from IPC should be checked as the status signal of the IPC is implausible. Healing Condition Com_stParkBrkSts2 signal should be with valid value Fault permanent deletion 1. Scan tool Service 14. 2. Stack Over Flow 3. 40 warm up cycles 4. ECU Flashing 5. ECU power fail Component Details: NA Preliminary Checks: 1. Check ECM is communicating with TML diagnostic DTC or not. 2. If not, check for short conditions between CAN HIGH-CAN LOW, CAN HIGH-GND, CAN LOW-GND, CAN HIGH-Vbatt and CAN LOW-GND at ECM vehicle side wiring harness. There should not be any short Circuit conditions. 3. There should be continuity between vehicle side wiring harness with following pins. IPC CAN HIGH to ECM CAN HIGH and IPC CAN LOW to ECM CAN LOW ECM CAN_H (Vehicle side connector) to IPC CAN_H and ECM CAN_L (Vehicle side connector) to IPC CAN_L Continuity should be there. 4. Read IVN DTCs in ECM after IGN ON condition with TML diagnostic tool. 5. Check with the CAN channel, which will affect communication 6. Check for Loose/Damaged connections 7. Check for Pin back out from ECU connector
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