12 Electrical System
12-31
12.14.6 Oxygen Sensor
This sensor is used in closed-loop
feedback controlled fuel injection to
improve the air-to-fuel ratio accuracy and
control the emission. It’s located in the
exhaust stream to measure the amount
of oxygen in exhaust and send the signal
to ECU, which can revise the fuel injector
output, so as to reduce the amounts of
unburnt fuel and make catalytic converter
convert HC, CO and NO
X
of Nitrogen
eciently.
Pin Function:
1
: output signal voltage +.
2
: output signal voltage -.
3
: to heated power -.
4
: to heated power +.
Coolant Temp. Sensor Inspection
Measure resistance between pin A and C
with multimeter:
ECU resistance (A-C)
Temp. °C Resistance(Ω)
-20±0.1 13.71~16.49
25±0.1 1.825~2.155
80±0.1 0.303~0.326
110±0.1 0.1383~0.1451
If the resistance is beyond standard, the
sensor is damaged. Replace with new one.
Measure sensor pin B resistance with
multimeter:
Temp. °C Resistance(Ω)
50±0.2 176-280
80±0.2 63.4-81.4
110±0.2 24.6-30.6
If the resistance is beyond standard, the
sensor is damaged. Replace with new one.
1
2
3
4
122401
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