TIAGO TIGOR CNG - SERVICE MANUAL

1.2L REVOTRON Bi FUEL CNG ENGINE 163 I. MANIFOLD AIR PRESSURE SENSOR AND TEMPERATURE SENSOR (T-MAP) :  Component Details : T-MAP sensor consists of a silicon chip mounted inside a reference chamber. On one side of the chip is the reference chamber and on the other side is the pressure to be measured. The electrical resistance of the chip varies with the variation of pressure. This change in resistance alters the voltage signal. ECM interprets the voltage signal as pressure and any change in voltage signal as change in pressure. The temperature sensor element is a NTC resistor.  Component Location : T-MAP Sensor is mounted on Intake Manifold. Preliminary Checks : 1. Inlet Air Circuit Clogging. 2. Loose / Damaged connections between sensor and EMS ECU 3. Check for back out of pins at both sensor connector and ECU connector. 4. Check for damage of pins at both sensor connector and ECU connector.  Connector View :  Connector Details : Connector Description 1 Ground 2 Supply 3 Pressure 4 Temperature  Component Specification : TMAP Sensor is used to measure the temperature & pressure of the Intake Air at Intake Manifold (Before Turbo). The piezo-resistive pressure sensor element and a suitable circuitry for signal amplification are integrated on a silicon chip. The measured 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