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):
*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:
|
|
(2) The A/C system periodically changes between normal and improper function due to moisture in the refrigerant system.
*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. |
|
|
(3) The A/C system does not function effectively due to insufficient refrigerant.
*a |
Low Pressure Side |
*b |
High Pressure Side |
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
|
Gas leakage from refrigeration system |
|
|
(4) The A/C system does not function effectively due to poor circulation of the refrigerant.
*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.
*a |
Low Pressure Side |
*b |
High Pressure Side |
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
|
|
Refrigerant does not circulate |
|
(6) The A/C system does not function effectively due to the system being overcharged with refrigerant or insufficient cooling of the condenser.
*a |
Low Pressure Side |
*b |
High Pressure Side |
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
Pressure extremely high on both low and high-pressure sides |
|
|
|
(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.
*a |
Low Pressure Side |
*b |
High Pressure Side |
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
|
Air in refrigeration system |
|
|
(8) The A/C system does not function effectively due to an expansion valve malfunction.
*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.
*a |
Low Pressure Side |
*b |
High Pressure Side |
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
|
Internal leakage in compressor |
|
Repair or replace compressor |
Terminals Of Ecu
TERMINALS OF ECU
1. CHECK DRIVER SIDE JUNCTION BLOCK AND MAIN BODY ECU (MULTIPLEX NETWORK BODY
ECU)
(a) Disconnect the MB main body ECU (multiplex network body ECU) connectors.
(b) Measure the voltage and resistance according to the value(s) in the table
below.
HINT:
Measure the values on ...
Removal
REMOVAL
PROCEDURE
1. PRECAUTION
CAUTION:
Be sure to read Precaution thoroughly before servicing (See page
).
NOTICE:
After turning the ignition switch off, waiting time may be required before disconnecting
the cable from the negative (-) battery terminal. Therefore, make sure to read the
...
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT COOLER CONDENSER ASSEMBLY
(a) If the fins of the cooler condenser assembly are dirty, clean them with water
and dry them with compressed air.
NOTICE:
Do not damage the fins of the condenser assembly.
(b) If the fins of the cooler condenser assembly ...