TIAGO TIGOR BSVI - SERVICE MANUAL - DTC 24-12-2021

TATA BSVI Gasoline Program – EMS ECU Bosch DTC Troubleshooting Service Manual Version: 1.2 Date: 18-12-2019 Prepared By: Sunita Mandlik Checked By: Yeshwant Jadhav Approved By: Satish Kumar Document Part No: 2921 02 xxx xxxx Page: 777 of 1498 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. P0641-1C: Output Voltage of the Sensor 1 Supply is Out of Specified Range – Circuit Voltage out of Range Overview: ISO Code P0641-1C Customer Symptom Fuel Consumption Increases Fault Effects (On Vehicle) No Altitude Adaptation, Fuel Consumption Increases, Damage to Sensor / EMS ECU Lamp Status (If Any) CE lamp ON after 1 drive cycle Fault Detection Condition This fault gets logged if the Sensor Reference Supply “1” pin of EMS ECU are short circuited to Ground or Battery or open circuited. Normal Operating Condition Healthy Supply Voltage to Sensors from EMS ECU. Probable Trouble Area Wiring Harness Connections, EMS ECU Healing Condition Ignition ON and after 1 driving cycles of fault rectification 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: EMS ECU has two Internal 5 Volts power supplies. Power Supply 1 will provide input voltage to a group of sensors-A (Accelerator pedal sensor 1, AC Refrigerant pressure Sensor, TMAP Sensor) and Power Supply 2 will give input voltage to another group of Sensors (Boost Pressure Sensor, Throttle Position Sensor, Accelerator pedal sensor 2) Preliminary Checks: 1) Loose/ Damaged Connections between any sensor of Sensor Group B (Acc. Pedal sensor 2 / Throttle Position Sensor / Boost Pressure Sensor) and EMS ECU. 2) Check for back out of pins at any sensor connector Sensor Group B (Acc. Pedal sensor 2 / Throttle Position Sensor / Boost Pressure Sensor) and ECU connector. 3) Check for damage of pins at any sensor connector of Sensor Group B (Acc. Pedal sensor 2 / Throttle Position Sensor / Boost Pressure Sensor) and ECU connector. 4) Check the continuity from all sensors of Sensor Group B (Acc. Pedal sensor 2 / Throttle Position Sensor / Boost Pressure Sensor) connector pins totheir respective EMS ECU pins.