ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT REFRIGERANT PRESSURE
(a) This method uses a refrigerant recovery unit set to locate problem areas. Read the refrigerant pressure when the test conditions are established.
Test conditions:
Gauge readings (Reference):
Text in Illustration
*a |
Pressure on low-pressure side |
*b |
Blower HI Zone |
*c |
Blower LO Zone |
*d |
Pressure on high-pressure side |
(1) Normally functioning refrigeration system. Gauge Reading:
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(2) The A/C system periodically changes between normal and improper function due to moisture in the refrigerant system.
Text in Illustration
*a |
Low Pressure Side |
*b |
High Pressure Side |
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
During operation, pressure on low pressure side cycles between normal and vacuum |
Moisture in refrigeration system freezes at expansion valve orifice, causing temporary stop of cycle. However, when melted, normal state is restored. |
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(3) The A/C system does not function effectively due to insufficient refrigerant.
Text in Illustration
*a |
Low Pressure Side |
*b |
High Pressure Side |
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
|
Gas leakage from refrigeration system |
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(4) The A/C system does not function effectively due to poor circulation of the refrigerant.
Text in Illustration
*a |
Low Pressure Side |
*b |
High Pressure Side |
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
|
Refrigerant flow obstructed by dirt in condenser |
Condenser clogged |
Replace condenser |
(5) The A/C system does not function or functions intermittently because the refrigerant does not circulate.
Text in Illustration
*a |
Low Pressure Side |
*b |
High Pressure Side |
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
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Refrigerant does not circulate |
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(6) The A/C system does not function effectively due to the system being overcharged with refrigerant or insufficient cooling of the condenser.
Text in Illustration
*a |
Low Pressure Side |
*b |
High Pressure Side |
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
Pressure extremely high on both low and high-pressure sides |
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(7) The A/C system does not function due to air in the refrigeration system.
CAUTION:
The low-pressure piping may be very hot and cause serious burns.
NOTICE:
These gauge indications occur when the refrigeration system opens and the system is charged with refrigerant without vacuum purging.
Text in Illustration
*a |
Low Pressure Side |
*b |
High Pressure Side |
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
|
Air in refrigeration system |
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(8) The A/C system does not function effectively due to an expansion valve malfunction.
Text in Illustration
*a |
Low Pressure Side |
*b |
High Pressure Side |
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
|
Problem with expansion valve |
|
Replace expansion valve |
(9) The A/C system does not function due to a defective compressor.
Text in Illustration
*a |
Low Pressure Side |
*b |
High Pressure Side |
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
|
Internal leakage in compressor |
|
Repair or replace compressor |
Screen Flicker or Color Distortion
PROCEDURE
1.
CHECK DISPLAY SETTING
(a) Reset display settings (contrast, brightness) and check that the screen appears
normal.
OK:
The display returns to normal.
OK
END
NG
PROCEED TO NEXT SUSPECTED AREA SHOWN IN ...
Disassembly
DISASSEMBLY
PROCEDURE
1. REMOVE BRAKE MASTER CYLINDER RESERVOIR FILLER CAP ASSEMBLY
2. REMOVE BRAKE MASTER CYLINDER RESERVOIR STRAINER
3. REMOVE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY
(a) Fix the brake master cylinder in a vise between aluminum plates.
NOTICE:
Do not overtighten the vise.
...
Removal
REMOVAL
PROCEDURE
1. REMOVE REAR SEAT CUSHION ASSEMBLY
(a) Remove the 6 bolts and 2 rear seat cushion assemblies.
2. REMOVE NO. 4 ROOM PARTITION COVER LH
3. REMOVE NO. 4 ROOM PARTITION COVER RH
4. REMOVE NO. 3 ROOM PARTITION COVER
...