1998 TOYOTA LAND CRUISER inspect

AC3P1-01
I25173
C10 C19
: Bulb
I07872
I25174
C22 C12
AC-104
- AIR CONDITIONINGAIR CONDITIONING CONTROL ASSEMBLY
2829 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION
1. w/o Navigation system:
INSPECT ILLUMINATION OPERATION
(a) Connect the positive (+) lead from the battery to terminal
C10 and negative (-) lead to terminal C19, then check
that the indicators illuminate.
If operation is not as specified, check the faulty bulb.
(b) Remove the bulb.
(c) Using the tester as shown in the illustration, test the conti-
nuity.
If continuity exists, replace the heater control.
If no continuity exists, replace the bulb.
2. w/o Navigation system:
INSPECT INDICATORS OPERATION
(a) Connect the positive (+) lead from the battery to terminal
C22 and negative (-) lead to terminal C12.
(b) Check that the indicators come on while operate the
switches.
If operation is not as specified, replace the heater control.
3. INSPECT A/C CONTROL ASSEMBLY CIRCUIT
(See page DI-1309)

I25175
A16A8
- AIR CONDITIONINGAIR CONDITIONING CONTROL ASSEMBLY
AC-105
2830 Author
: Date
:
2004 LAND CRUISER (RM1071U)
4. w/ Navigation system:
INSPECT ILLUMINATION OPERATION
(a) Connect the positive (+) lead from the battery to terminal
A8 and negative (-) lead to terminal A16.
(b) Check that the indicators come on while operating the
switches.
If operation is not as specified, replace the heater control.
5. INSPECT A/C CONTROL ASSEMBLY CIRCUIT
(See page DI-1309)

AC22D-03
I06876
AC-1 10
- AIR CONDITIONINGAIR CONDITIONING AMPLIFIER (for Rear A/C)
2835 Author
: Date
:
2004 LAND CRUISER (RM1071U)
AIR CONDITIONING AMPLIFIER
(for Rear A/C)
INSPECTION
1. REMOVE REAR DOOR SCUFF PLATE RH
2. REMOVE REAR FLOOR MAT SUPPORT PLATE
3. REMOVE QUARTER TRIM PANEL RH
4. REMOVE A/C AMPLIFIER
(a) Disconnect the connectors.
(b) Remove the 2 screws and the A/C amplifier.
5. INSPECT REAR A/C AMPLIFIER CIRCUIT
(See page DI-1309)

AC1HN-04
N13793
Charging Cylinder High Pressure
Service Valve Low Pressure
Service ValvePush
Air
N13792
Gas Leak
Detector
- AIR CONDITIONINGAIR CONDITIONING SYSTEM
AC-1 1
2736 Author
: Date
:
2004 LAND CRUISER (RM1071U)
CHARGING
1. INSTALL CHARGING CYLINDER
HINT:
When handling the charging cylinder, always follow the direc-
tions given in the instruction manual.
(a) Charge the proper amount of refrigerant into the charging
cylinder.
(b) Connect the center hose to the charging cylinder.
CAUTION:
Do not open both high and low hand valves of manifold
gauge set.
(c) Open the valve of the charging cylinder.
(d) Press the valve core on the side of manifold gauge and
expel the air inside the center hose.
2. INSPECT REFRIGERATION SYSTEM FOR LEAKS
(a) Open the high pressure hand valve and the charge refrig-
erant.
(b) When the low pressure gauge indicates 98 kPa
(1 kgf/cm
2, 14 psi), close the high pressure hand valve.
(c) Using a gas leak detector, check the system for any leak-
age.
If leaks are found, repair the faulty component or connection.
CAUTION:
Use the refrigerant recovery/ recycling machine to recover
the refrigerant whenever replacing parts.

AC1HL-05
I06757
Sight Glass
- AIR CONDITIONINGAIR CONDITIONING SYSTEM
AC-3
2728 Author
: Date
:
2004 LAND CRUISER (RM1071U)
ON-VEHICLE INSPECTION
1. INSPECT REFRIGERANT VOLUME
Observe the sight glass on the liquid tube.
Test conditions:

Engine speed at 1,500 rpm

Fan speed selector at ºHIº position

A/C switch ON

Temperature control dial at ºCOOLº position

Doors fully opened
ItemSymptomAmount of refrigerantRemedy
1Bubbles appear in sight glassInsufficient*
(1) Check for gas leakage with gas leak de-
tector and repair, if necessary
(2) Add refrigerant until bubbles disappear
2No bubbles appear in sight glassNone, sufficient or too muchRefer to item 3 and 4
3No temperature difference between com-
pressor inlet and outletEmpty or nearly empty
(1) Check for gas leakage with gas leak de-
tector and repair, if necessary
(2) Add refrigerant until bubbles disappear
4Temperature between compressor inlet and
outlet is noticeably differentCorrect or too muchRefer to items 5 and 6
5
Immediately after air conditioning system is
turned off, refrigerant in sight glass stays
clear
Too much
(1) Discharge refrigerant
(2) Evacuate air and charge proper amount
of purified refrigerant
6When air conditioning system is turned off,
refrigerant foams and then stays clearCorrect-
*: Bubbles in the sight glass with ambient temperatures higher than usual can be considered normal if cooling
is sufficient.

I01386
AC-4
- AIR CONDITIONINGAIR CONDITIONING SYSTEM
2729 Author
: Date
:
2004 LAND CRUISER (RM1071U)
2. INSPECT REFRIGERANT PRESSURE WITH MAN-
IFOLD GAUGE SET
Check the trouble area using a set of manifold gauge set. Read
the manifold gauge pressure when following conditions are de-
tected.
Test conditions:

Temperature at the air inlet with the switch set
at RECIRC is 30 - 35 °C (86 - 95 °F)

Engine running at 2,000 rpm

Fan speed selector at ºHIº position

Temperature control dial on ºCOOLº position
HINT:
It should be noted that the gauge indications may vary depend-
ing on ambient temperature conditions.
(1) Normally functioning refrigeration system.
Gauge reading:
Low pressure side:
0.15 - 0.25 MPa (1.5 - 2.5 kgf/cm
2)
High pressure side:
1.37 - 1.57 MPa (14 - 15 kgf/cm
2)

I01387
Condition : Periodically cools and then fails to cool
I01388
Condition: Insufficient cooling
- AIR CONDITIONINGAIR CONDITIONING SYSTEM
AC-5
2730 Author
: Date
:
2004 LAND CRUISER (RM1071U)
(2) Moisture present in refrigeration system.
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy
During operation, pressure on low
pressure side sometimes become
a vacuum and sometime normal
Moisture entered in refrigeration
system freezes at expansion valve
orifice and temporarily stops cycle,
but normal state is restored after a
time when the ice melts
Drier in over-saturated state

Moisture in refrigeration system
freezes at expansion valve orifice
and blocks circulation of refriger-
ant(1) Replace condenser
(2) Remove moisture in cycle
through repeatedly evacuating air
(3) Charge proper amount of new
refrigerant
(3) Insufficient cooling.
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy

Pressure low on both low and
high pressure sides

Bubbles seen in sight glass con-
tinuously

Insufficient cooling performance
Gas leakage at some place in re-
frigeration system
Insufficient refrigerant in system

Refrigerant leaking
(1) Check for gas leakage with gas
leak detector and repair if neces-
sary
(2) Charge proper amount of re-
frigerant
(3) If indicated pressure value is
near 0 when connected to gauge,
create the vacuum after inspecting
and repairing the location of the
leak

- AIR CONDITIONINGAIR CONDITIONING SYSTEM
AC-9
2734 Author
: Date
:
2004 LAND CRUISER (RM1071U)
3. INSPECT IDLE-UP SPEED
(a) Warm up engine
(b) Inspect idle-up speed when following conditions are es-
tablished.
Test conditions:

Fan speed selector at ºHIº position

Temperature control dial at ºCOOLº position

A/C switch ON

Put gear shift in neutral
Magnetic clutch conditionIdle-up speed
Magnetic clutch not engaged700 ± 50 rpm
Magnetic clutch engaged780 ± 50 rpm
If idle speed is not as specified, check the idle control system.
4. INSPECT FOR LEAKAGE OF REFRIGERANT
(a) Stop engine.
(b) Secure good ventilation (The gas leak detector may not
react to volatile gases which are not refrigerant, such as
evaporated gasoline and exhaust gas)
(c) Repeat the test 2 or 3 times
(d) Make sure that there is some refrigerant remaining in the
refrigeration system.
When compressor is OFF: approx. 392 - 588 kPa (4 - 6
kgf´cm
2, 57 - 85 psi)
(e) Bring the gas leak detector close to the drain hose before
performing the test.
HINT:

After the blower motor stops, leave the cooling for more
than 15 minutes.

Expose the gas leak detector sensor under the drain
hose.

When bring the gas leak detector close to the drain hose,
make sure that the gas leak detector does not react to the
volatile gases.
If gas leaks are detected, lift up the vehicle.
(f) If gas leaks are not detected on the drain hose, remove
the blower resistor from the cooling unit. Then insert the
gas leak detector sensor into the unit to perform the test.
(g) Disconnect the connector and leave the pressure switch
for approx. 20 minutes. Then bring the gas leak detector
close to the pressure switch to perform the test.
(h) Bring the gas leak detector close to the refrigerant lines.