Chery A11 2003 Repair Manual page 614

●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)
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
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)
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
Resistance Heat Co-efficiency
impedance
(23-800℃) (ppm/℃)
Temp.(℃)
100865 25
72437 30
52594 35
38583 40
28582 45
21317 50
16120 55
12261 60
9399 65
7263 70
5658 75
4441 80
3511 85
D heater ground (pin B16)
13.2+/-10%
of 1150
Resistance(Ω) Temp.(℃)
2795 90
2240 95
1806 100
1465 105
1195 110
980 115
809 120
671 125
559 130
469 135
395 140
334 145
283 150
Resistance(
241.8
207.1
178.0
153.6
133.1
115.7
100.9
88.3
77.5
68.3
60.3
53.4
47.5