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Nexon Gasoline – EMS ECU Bosch
DTC Troubleshooting Manual
Version: 0.1
Date: 26-08-2017
Prepared By: Sunu S Babu/Yogesh Jadhav
Checked By: Yeshwant Jadhav
Approved By: Satish Kumar
Document Part No: 2921 02 224 A1736
Page: 810 of 1203
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.