●Measuring Method
a ohmmeter method
Measure resistance with an ohmmeter, and determine if water temperature sensor operates
upon measured engine coolant temperature and below diagram. Remove coolant
temperature sensor, immerse into water and heat water. The sensor has different resistance
at corresponding temperature.
Water Temperature Sensor Resistance Specification
Temperature(℃) Resistance(Ω) Temp.(℃) Resistance(Ω) Temp.(℃) Resistance(
-40 100865 25 2795 90 241.8
-35 72437 30 2240 95 207.1
-30 52594 35 1806 100 178.0
-25 38583 40 1465 105 153.6
-20 28582 45 1195 110 133.1
-15 21317 50 980 115 115.7
-10 16120 55 809 120 100.9
-5 12261 60 671 125 88.3
0 9399 65 559 130 77.5
5 7263 70 469 135 68.3
10 5658 75 395 140 60.3
15 4441 80 334 145 53.4
20 3511 85 283 150 47.5
b voltmeter method
Install the sensor on the motor, and crank engine. Connect sensor signal lead to
voltmeter, there are different voltage drop at different temperature.
Oxygen sensor
Oxygen sensor is installed on exhaust pipe and accurately regulate excess air co-efficiency .
Oxygen sensor has 4 leads: C. voltage lead (pin A16) B. signal lead (pin B1)
A. signal ground (pin B23) D heater ground (pin B16)
PIN Function
C Sensor
voltage lead
B Sensor signal
output
A Signal ground
D Heater ground
Oxygen sensor heater resistance impedance specification table
when temperature is 23℃, impedance is 13.2+/-10%
Resistance Heat Co-efficiency of
impedance
(23-800℃) (ppm/℃)
1150
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