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8-2 Diagnosing the main components
Components
Compressor
• Use the tester to measure
the resistance.
– Bring the component to cool down
completely before measuring.
P.T.C Relay
Condenser
Overload
protector
Fan-motor
Door switch
Defrost heater
Diagnosing methods and criteria Location
Measuring point
Primary iwre
Secondary wire
Normal
Approx 10 ~ 500kΩ
3 ~ 20Ω
Abnormal
0Ω and
∞Ω
• Use the tester to measure
the resistance.
– Bring the component to cool down
completely before measuring.
Normal
Approx ∞Ω ~ kΩ
Abnormal
0Ω and ∞Ω
Normal
Approx 10Ω ~ 80kΩ
Abnormal
0Ω and ∞Ω
Normal
0Ω
Abnormal
∞Ω
Normal
Approx 100Ω ~ 20kΩ
Abnormal
0Ω and ∞Ω
• Use the tester to measure
the resistance.
– Bring the component to cool down
completely before measuring.
• Use the tester to measure
the resistance.
– Bring the component to cool down
completely before measuring.
• Use the tester to measure
the resistance.
• Use the tester to measure
the resistance.
Measuring point
A B contact point
When the switch is
on by the contact
and∞Ω
Normal
Approx200MΩ
Abnormal
∞MΩ
• Use the tester to measure
the resistance.
– Bring the component to cool down
completely before measuring.
Mechanical
compartment
Mechanical
compartment
Electrical
equipment box
Mechanical
compartment
Mechanical
compartment
Freezing
compartment
Between the
upper and the
lower doors
EVAP
Normal
40Ω ~200Ω
Abnormal
∞ MΩ ~ ∞Ω