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1.2L REVOTRON ENGINE
188
SENSOR STANDALONE DIAGNOSIS
Use multi-meter to check for signal voltage at pin1
and pin3.
Supply Voltage: - 5V DC.
Signal Voltage:
0.4 V at 10 kpa (absolute)
4.65 V at 115 kpa (absolute)
Use TATA diagnostic tool to check for 'Intake
manifold pressure and Air temperature' values.
1. Give 5V Power Supply to the Sensor Supply
pin and Ground to the Sensor Ground Pin
2. Keep the sensor in a pressurized environment
of 50 bar.
3. Measure the Voltage between the Sensor
pressure Signal Pin and Ground, it should be
2.1 Volts approx.
4. Check the resistance between the Sensor
Temperature signal pin and EMS ECU, at
Room temperature of 30°C, it should be ~1080
Ohms.
II. LAMBDA SENSOR
COMPONENT DETAILS
The oxygen sensor operates on the principle of
galvanic oxygen concentration cell (Nernst cell)
with solid electrolyte (Nernst's principle). The
ceramic sensing element is a conductor of oxygen
ions from a temperature of 350°C. A heater is
integrated on the sensing element. It is placed
into the exhaust manifold. The sensing element
compares the residual oxygen content in the
exhaust gas with the oxygen content in the
reference atmosphere (air surrounding the
sensing element). This gives an output voltage
between 100mV (lean exhaust gas) to 800mV
(rich exhaust gas), depending on whether the
exhaust gas is lean or rich.
COMPONENT LOCATION
The lambda sensor is mounted at the input and
output of the catcon as upstream and downstream
lambda sensor.