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: 1548 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. P0090-13: Shut off Valve Pressure Regulator( Sig Error) Overview: ISO Code P0090-13 Customer Symptom Vehicle will not be able to drive in CNG Mode Fault Effects (On Vehicle) 1. Fuel mode switchover will happen from CNG to Gasoline fuel mode 2. CNG leak detection in the low pressure line is not activated. Lamp Status (If Any) MIL ON in 1 drive cycle Fault Detection Condition This fault occurs when CNG Pressure Regulator Pin 249 open circuit in engine running condition in Gasoline Mode Normal Operating Condition Vehicle will be able to run in both CNG and Gasoline fuel mode Probable Trouble Area Wiring Harness Connections, CNG Pressure Regulator and EMS ECU Healing Condition After 3 drive cycles in CNG Mode Only, CNG Regulator open to close transition required 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: pressure regulator is a valve that automatically cuts off the flow of a gas at a certain pressure. Regulators are used to allow high-pressure supply lines or tanks to be reduced to safe and/or usable pressures for various applications. Preliminary Checks: 1) Loose/ Damaged Connections between Pressure Regulator and EMS ECU. 2) Check for back out of pins at both Pressure Regulator connector and ECU connector. 3) Check for damage of pins at both Pressure Regulator connector and ECU connector. 4) Check the continuity from Pressure Regulator connector pins to the ECU pins. Trouble Shooting:- Step Checks IF YES IF NO 1. Check the continuity from Regulator pin to the ECU pins 249. Rectify/Replace Connectors Go to Step 2. 2. Check for back out of pins at both Regulator connector and ECU connector Rectify/Replace Connectors Go to Step 3. 3. Check for damage of pins at both Regulator connector and ECU connector Rectify/Replace Connectors Go to Step 4. 4. Pressure Regulator Pin open circuit Rectify/Replace Connectors Go to Step 5. 5. Fault Still Persists? Replace Sensor and then Fault still persists then Replace EMS ECU Follow the steps again for reconfirmation DTC’s confirmation:- Recheck the fault using TML Diagnostic tool, Fault shall not appear.
RkJQdWJsaXNoZXIy MTIwNTUz