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: 1532 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. P1608-22: Signal error for CNG LID Overview: ISO Code P1608-22 Customer Symptom CNG Switch LED & CNG Lamp will Blink in case of Ignition ON. Fault Effects (On Vehicle) Vehicle may not be crank in case of fuel cap is open Lamp Status (If Any) CE Lamp ON. Fault Detection Condition This fault gets logged when CNG Fuel LID pin 117 Open / SCB/ SCG. This fault gets logged when CNG Fuel LID pin 146 Open / SCB/ SCG. Normal Operating Condition Healthy Wiring Harness connections between CNG LID and EMS ECU Probable Trouble Area Wiring Harness Connections, CNG LID, ECU Healing Condition After 1 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: 1. This component gives fuel Lid/cap open-close based on two digital input switch. 2. It is used to indicate the user that Lid/cap is open. 3. This function is used for safety purpose to avoid any safety critical scenario during CNG Gas refulling. Preliminary Checks: 1) Loose/ Damaged Connections between Fuel LID switch and EMS ECU. 2) Check for back out of pins at both LID switch connector and ECU connector. 3) Check for damage of pins at both LID switch connector and ECU connector. 4) Check the continuity from LID switch connector pins to the ECU pins.
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