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: 1086 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. U0101-31: Lost Communication with TCM-No Signal Overview: ISO Code U0101-31 Customer Symptom Gear Shifting is Not possible. Fault Effects (On Vehicle) Gear shifting is Not possible. Lamp Status (If Any) MIL Lamp ON after 1 drive cycles Fault Detection Condition TCU related CAN messages are NOT received by EMS. – No CAN frame received. Normal Operating Condition ECU and TCU are communicating properly Probable Trouble Area CAN messages from TCU are not received by the ECU; Battery low voltage or high voltage. Healing Condition After 3 engine / Driving cycles (if TCM / TCU CAN frames are received for 3 continuous cycle, MIL lamp will go in 4th cycle). Fault permanent deletion 1. Scan tool Service 14. 2. Stack Over Flow. 3. 40 warm up cycles. 4. ECU Flashing. 5. ECU power fail 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 (pin details are provided with schematic in the document). There should not be any short Circuit conditions. 3. There should be continuity between vehicle side wiring harness with following pins. i. IPC CAN HIGH (pin. 6) to ECM CAN HIGH (C1, 132) and IPC CAN LOW (pin. 5) to ECM CAN LOW (C1, 144) ii. ECM CAN_H (Vehicle side connector (C1, 132)) to TCM CAN_H (pin no 25) and ECM iii. CAN_L (Vehicle side connector (C1, 144) to TCM CAN_L (pin no 28) 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 if the ECU is faulty 8. Check if the TCU is faulty
RkJQdWJsaXNoZXIy MTIwNTUz