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: 1661 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. P2BF1-92: System Too Rich – Performance or Incorrect Operation (CNG mode) Overview: ISO Code P2BF1-92 Customer Symptom Acceleration and Overall vehicle performance will be affected Fault Effects (On Vehicle) 1. Too Rich fuel can heat of the engine as well as exhaust components. 2. Acceleration and overall vehicle performance is affected. 3. Lambda short term and long term adaptations will be switched o Lamp Status (If Any) MIL ON after 3 drive cycles Fault Detection Condition This fault gets logged if the fuel content in the Air fuel mixture is higher than required or air content is lower than required. Normal Operating Condition Air Fuel Mixture will be appropriate to the Torque and Emissions requirement. Probable Trouble Area Fuel Regulator/ Inlet metering valve stuck open, Injectors, Throttle valve stuck Closed Healing Condition Vehicle running and after 3 drive cycles 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: The CNG Fuel injectors are normally closed solenoid valves which operate when the electromagnetic core is energized by ECU. Based on engine operating conditions, ECU adjusts injection pulse widths to inject precise amount of fuel required. Preliminary Checks: 1) Check for any blockage in fuel line 2) Check for fuel regulator. 3) Check any blockage/leakage injectors. 4) Check any Air leakage through intake
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