TIAGO

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1.2L REVOTRON ENGINE
151
 Preliminary Checks :
1. Loose/ Damaged Connections between
Sensor and EMS ECU.
2. Check for back out of pins at both Sensor
connector and ECU connector.
3. Check for damage of pins at both sensor
connector and ECU connector.
4. Check the continuity from sensor
connector pins to the ECU pins.
5. Check for Sensor poisoning /
 Connector View :
 Connector Details :
Connector Description
Upstream Downstream
1 Supply Supply
2 Ground Heater
3 Heater Ground
4 Signal Signal
 Component Specification :
The lambda sensor is mounted on the closed
couple catcon. The lambda sensor has a four pin
connector with a special ceramic body and gas
permeable platinum electrodes on the surface.
When the ceramic body is exposed to
temperature 3500 C, oxygen in the air diffuses into
ceramic body. Depending on the porosity
electrodes which are exposed to gas having
varied level of oxygen. The lambda sensor
provides air/fuel ratio signal in mili volts to ECU as
a function of varying air/fuel ratio.
At 3500C,
Lambda = 0.97 - 800 mV ± 55 mV(Rich mixture)
Lambda = 1.1 - 50 mV ± 30 mV (Lean mixture)
 Sensor Stand alone Diagnosis :
Connector details
Use TATA diagnosis tool to check for :
Signal voltage - > than 0.5V or < than 0.4V
Switching frequency - > than 0.2 Hz
Use multimeter to check the heater function by
measuring the heater resistance.
Heater resistance at room temperature – 90 ohms
Supply voltage – 12V DC
Check the signal voltage (Between pin number 2
and 3)
Signal Voltage - 0.68 ± 0.25V DC- at idle position
Signal Voltage - 04.25 ± 0.45V DC – at WOT
position