Page 223 - Workshop Manual - Aumark (BJ1051)

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Diagnosis-illlumination

Basic Checks

Step Check item Measure
1
Checking for presence of refrigerant Y Go to step 2.
• Screw off protective cover of service valve of A/C refrigeration N Add refrigerant.
system, and press valve core.
Is check result normal?
2
Checking A/C switch Y Go to step 3.
• Turn on air conditioner. N Go to malfunction
• Visually check if A/C working indicator light comes on. sympotoms table.
Is check result normal?
3
Checking electromagnetic clutch Y Go to step 4. 04
• Check electromagnetic clutch for normal pick-up. Go to malfunction
Is check result normal? N sympotoms table.
4
Checking driving belt Y Go to step 5.
• Check driving belt for slip. Go to malfunction
Is check result normal? N sympotoms table.
5
Checking compressor Y Go to step 6.
• If abnormal sound is heard when compressor is working. Go to malfunction
Is check result normal? N sympotoms table.
6
Checking condenser Y Go to step 7.
N Clear foreign materials or
• Check between condenser and radiator for foreign materials. replace condenser fan.
• Check condenser fan for normal operation.
Check if condenser is normal.
7
Checking refrigerant volume Y Go to step 8.
• Through sight hole, view volume of refrigerant in the system. N Go to malfunction
Is check result normal? sympotoms table.
8
Checking lines and circuits Y Go to step 9.
• Check lines and circuits for bending or kinks that will cause N Lay lines and circuits again.
blocking.
Is check result normal?
9
Checking high and low-pressure lines Y Go to step 10.
N Go to malfunction
• Touch A/C line. The low-pressure pipe between evaporator
outlet and compressor should feel cold; the high-pressure pipe sympotoms table.
between compressor and condenser should feel hot; the pipe
sections from condenser to receiver drier and before receiver
drier-expansion valve should feel warm; the pipe sections before
and after expansion valve should have a significant temperature
difference.
Is check result normal?
10 Go to malfunction
Checking junctions Y sympotoms table.
• Check junctions between condenser, refrigerant pipe and other N Perform a leakage test.
lines for oil traces.
Is check result normal?

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