Troubleshotting
U-43
Troubleshooting procedure
Step Inspection Action
1 Inspect a/c compressor skidding noise
l Is there a strident sound (a/c compressor
skidding noise)?
Yes Go to step 9.
No Go to next step.
2 Inspect a/c compressor interference noise
l Is there a squeaking or whirling sound
(interference noise)?
Yes Go to step 12.
No Go to next step.
3 Inspect electromagnetic clutch operation noise
l Is there “click” sound (electromagnetic
clutch operation noise)?
Yes Adjust clearance between pressure plate
of electromagnetic clutch and a/c
compressor pulley, go to step 13 (see
u-27, electromagnetic clutch
adjustment).
No Go to next step.
4
Inspect duration of a/c compressor noise
l Is noise heard continuously for more than 3
seconds after a/c compressor started?
Yes Go to next step.
No Condition is normal.(noise always
occurs for 2-3 seconds immediately
after a/c compressor started)
5 Inspect idling speed
l Inspect idling speed. See f-3, idling speed
inspection.
l Is it normal?
Yes Adjust idling speed, go to step 13.
No Go to next step.
6
Verify whether malfunction is in compressor
oil or a/c compressor.
l Drain all compressor oil.
l Is compressor oil contaminated by metal
powder?
Yes Change compressor oil, go to step 13.
No Go to next step.
7
Verify whether malfunction is in the whole a/c
system or a/c compressor or condenser.
l Does compressor oil become white and is it
mixed with water?
Yes Replace the whole a/c system (except
heater), go to step 13.
No Go to next step.
8
Inspect compressor oil
l Is compressor oil darker than normal state?
Is there any aluminum fragment?
Yes Replace a/c compressor and condenser,
go to step 13. (because a/c compressor
might wear out and fluid reservoir/drier
might be clogged, thus condenser
should be replaced.)
No Condition is normal. Recheck the
malfunction symptom.
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