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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: 177 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.
Stand alone diagnosis:
TMAP Sensor is used to measure the temperature & pressure of the Intake Air @ Intake Manifold (
Before Turbo
). The
piezo-resistive pressure Sensor element and a suitable Circuitry for signalamplification are integrated on a silicon chip.
Themeasured pressure operates from above to the active side of the silicon diaphragm. Temperature Sensor is a NTC
Element.The manifold air pressure Sensor is mounted on intake manifold plenum and the bolt tightened at specified
torque. The T-MAP Sensor is a four pin peizo-resistance semiconductor device with a negative temperature
coefficient.
The T-MAP Sensor provides intake air pressure and temperature details to ECU, which then calculates the correct
quantity of fuel to be injected to each cylinder. A DC signal voltage is produced by the Sensor, which gets excited due
to varying manifold air pressure which is felt on semiconductor diaphragm.
Diagnosis
Use multimeter to check for signal voltage
at pin1 and pin3.
Supply voltage :- 5V DC.
Signal Voltage :
0.4 V @ 10 kpa (absolute)
4.65 V @ 115 kpa (absolute)
Connector details :
1. M2A2 : Ground
2. M1A2 : Temperature signal
3. M2E1 : Supply 5V
4. M2C1 : Pressure signal
Use TATA diagnostic tool to check for 'Intake manifold pressure and Air temperature' values.
Transfer Function of Pressure Sensor:
Uout= (c1*pabs+c0).US
Where, Uout = signal output voltage in V
US = supply voltage in V
pabs = absolute pressure in kPa
c0 = -0.1/105
c1 = 0.85/105 kPa-1
Characteristics of Pressure Sensor:
Characteristics of Pressure Sensor with Supply Voltage of 5 Volts