Line pressure LEXUS GS400 2000 Service Repair Manual

AC0W8±01
N13795
Quick Disconnect
Adapter
Charging
Service ValveHose
N13794
Vacuum Pump
Vacuum Pump Adapter
N13791
Low Pressure
Service Valve
Vacuum Pump Adapter High Pressure
Service ValveManifold
Gauge
Set
AC±10
± AIR CONDITIONINGAIR CONDITIONING SYSTEM
2695 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
EVACUATING
1. CONNECT QUICK DISCONNECT ADAPTER TO
CHARGING HOSES
2. REMOVE CAPS FROM SERVICE VALVES ON RE-
FRIGERANT LINES
3. SET ON MANIFOLD GAUGE SET
(a) Close both hand valves of manifold gauge set.
(b) Connect the quick disconnect adapters to the service
valves.
4. EVACUATE AIR FROM REFRIGERATION SYSTEM
(a) Connect the vacuum pump adapter to the vacuum pump.
(b) Connect the center hose of the manifold gauge set to the
vacuum pump adapter.
(c) Open both the high and low hand valves and run the vacu-
um pump.
(d) After 10 minutes or more, check that the low pressure
gauge indicates 750 mmHg (30 in. Hg) or more.
HINT:
If the reading is 750 mmHg (30 in. Hg) or more, close both hand
valves of manifold gauge set and stop the vacuum pump.
Check the system for leaks and repair if necessary.
(e) Close both the high and low hand valves and stop the vac-
uum pump.
(f) Leave the system in this condition for 5 minutes or more
and check that there is no gauge indicator.

N13790
Low Pressure
Service Valve
High Pressure
Service Valve
AC±12
± AIR CONDITIONINGAIR CONDITIONING SYSTEM
2697 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
3. 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 charging cylinder.
(d) Press the valve core on the side of manifold gauge and
expel the air inside of the center hose.
A fully charged system is indicated by the sight glass being free
of any bubbles.
4. SET OFF MANIFOLD GAUGE SET
(a) Close both hand valves of manifold gauge set.
(b) Disconnect the quick disconnect adapters from the ser-
vice valves.
5. INSTALL CAPS TO SERVICE VALVES ON REFRIGER-
ANT LINES

I02353
GS400:
Low Pressure
Charging HoseHigh Pressure
Charging Hose
I02354
GS300:
Low Pressure
Charging HoseHigh Pressure
Charging HoseAC0WE±01
N04392
Sleeve
± AIR CONDITIONINGMANIFOLD GAUGE SET
AC±17
2702 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
MANIFOLD GAUGE SET
SET ON
1. CONNECT CHARGING HOSES TO MANIFOLD
GAUGE SET
Tighten the nuts by hand.
CAUTION:
Do not connect the wrong hoses.
2. CONNECT QUICK DISCONNECT ADAPTERS TO
CHARGING HOSES
Tighten the nuts by hand.
3. CLOSE BOTH HAND VALVES OF MANIFOLD GAUGE
SET
4. REMOVE CAPS FROM SERVICE VALVE ON REFRIG-
ERANT LINES
5. CONNECT QUICK DISCONNECT ADAPTERS TO SER-
VICE VALVES
HINT:
Push the quick disconnect adapter onto the service valve, then
slide the sleeve of the quick disconnect adapter downward to
lock it.

± AIR CONDITIONINGAIR CONDITIONING SYSTEM
AC±9
2694 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
3. INSPECT IDLE±UP SPEED
(a) Warm up engine
(b) Inspect idle±up speed when the these conditions are es-
tablished.
Test conditions:

Blower speed control switch at ºHIº position

Temperature control dial at ºCOOLº position

A/C switch ON

Put gear shift in neutral
GS300:
Magnetic clutch conditionIdle±up speed
Magnetic clutch not engaged700 ± 50 rpm
Magnetic clutch engaged800 ± 50 rpm
If idle speed is not as specified, check the idle control system.
GS400:
Magnetic clutch conditionIdle±up speed
Magnetic clutch not engaged750 ± 50 rpm
Magnetic clutch engaged800 ± 50 rpm
If idle speed is not as specified, check the idle control system.
4. INSPECT FOR LEAKAGE OF REFRIGERANT
(a) Perform in these conditions.

Stop engine

Secure good ventilation (If the gas leak detector
may not react volatile gases which are not refriger-
ant, such as evaporated gasoline and exhaust gas)

Repeat the test 2 or 3 times

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)
(b) Bring the gas leak detector close to the drain hose before
performing the test.
HINT:

After the blower motor has stopped, 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 such reaction is unavoidable, the vehicle must be lifted up.
(c) If gas leak is not detected on the drain hose, remove the
blower resistor from the cooling unit. Then insert the gas
leak detector sensor into the unit and perform the test.
(d) Disconnect the connector and leave the pressure switch
for approx. 20 minutes. Then bring the gas leak detector
close to the pressure switch and perform the test.
(e) Bring the gas leak detector close to the refrigerant lines.

AT067±01
D01040

Gasket
Clamp
ClampAir Cleaner, MAF Meter and Intake
Air Connector Pipe Assembly
Exhaust Manifold with TWC
Connector and
Wire Harness Level Gauge
Filler PipeAdjusting WasherPropeller Shaft Assembly
Shift Control Rod
Torque Converter ClutchPlug for Line
Pressure TestHeat Insulator
Heated Oxygen Sensor
Front and Center
Exhaust PipeFront Floor
Center Brace
Engine Under Cover Pipe Support BracketO±Ring Heat Insulator

Gasket
Starterx6x839 (400, 29)
44 (450, 33)
72 (730, 53)
37 (380, 27)
13 (130, 9)
79 (805, 58)
37 (375, 27)
7.4 (75, 65 in.´lbf)
44 (450, 33)
44 (450, 33)
37 (380, 27)
37 (380, 27)
Hole Plug
5.4 (55, 48 in.´lbf)
Oil Cooler Pipe
x5

O±Ring
5.4 (55, 48 in.´lbf)

Gasket
44 (450, 33)


5.4 (55, 48 in.´lbf)
N´m (kgf´cm,ft´lbf) : Specified torque

Non±reusable part
Gasket
48 (490, 35)
26 (270, 20)
44 (450, 33)
44 (450, 33)


79 (805, 58)
± AUTOMATIC TRANSMISSIONAUTOMATIC TRANSMISSION UNIT (2JZ±GE)
AT±27
1975 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
AUTOMATIC TRANSMISSION UNIT (2JZ±GE)
COMPONENTS

AT06A±01
D01049
Oil Cooler Pipe
Connector and Wire Harness
Level Gauge
Torque Converter Clutch
Flywheel Housing
Under CoverPlug for Line
Pressure Test
Front and Center Exhaust PipePropeller Shaft Assembly
Heated Oxygen Sensor
Pipe Support BracketRH Front TWC
Engine Under CoverHeat Insulator
Ground CableHeat Insulator
GasketO±Ring x6Adjusting Washer
Filler Pipe
44 (450, 33)
79 (805, 58)
37 (375, 27)
79 (805, 58)
13 (130, 9)
37 (380, 27)
18 (185, 13)
44 (450, 33)
44 (450, 33)
62 (630, 46)
62 (630, 46)
72 (730, 53)
37 (380, 27)
48 (490, 35)
44 (450, 33)44 (450, 33)
5.4 (55, 48 in.´lbf)
5.4 (55, 48 in.´lbf)
Heat Insulator
26 (270, 20)

Gasket
LH Front TWC
44 (450, 33)

Gasket

Gasket


















N´m (kgf´cm, ft´lbf) : Specified torque
Non±reusable part
Heat Insulator
5.4 (55, 48 in.´lbf)
44 (450, 33)
44 (450, 33)

O±Ring
Heated Oxygen
SensorFront Floor
Center Brace
7.4 (75, 65 in.´lbf)
x6
± AUTOMATIC TRANSMISSIONAUTOMATIC TRANSMISSION UNIT (1UZ±FE)
AT±33
1981 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
AUTOMATIC TRANSMISSION UNIT (1UZ±FE)
COMPONENTS

BR0JC±04
D01827
LEXUS
Hand±held
Tester
DLC3
BR±4
± BRAKEBRAKE FLUID
2112 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
BRAKE FLUID
BLEEDING
HINT:

If any work is done on the brake system or if air in the
brake lines is suspected, bleed the air from the system.

When bleeding, keep the amount of the fluid within the
line of reservoir between Min. and Max.
NOTICE:

Do not let brake fluid remain on painted surfaces.
Wash it off immediately.

With the reservoir cap removed, when depressing the
brake pedal, the fluid will spray.
1. FILL RESERVOIR WITH BRAKE FLUID
Fluid: SAE J1703 or FMVSS NO. 116 DOT3
2. IN CASE OF USING LEXUS HAND±HELD TESTER:
BLEED HYDRAULIC BRAKE BOOSTER
HINT:
If the hydraulic brake booster has been disassembled, discon-
nect the brake line from the hydraulic brake booster or if the res-
ervoir becomes empty, bleed the hydraulic brake booster.
(a) Turn the ignition switch OFF, depress the brake pedal
more than 40 times.
HINT:
When a pressure in power supply system is released, reaction
force becomes heavy and stroke becomes shorter.
(b) Turn the ignition switch ON, check that the pump stops af-
ter approx. 30 to 40 seconds.
NOTICE:
When the pump does not stop, repeat step (a) and (b) again.
(c) With the ignition switch remained ON, depress the brake
pedal more than 20 times.
(d) Observe the procedure in step 4 and bleed the right and
left front brake caliper.
(e) Holding the brake pedal depressed, bleed the right and
left rear brake caliper.
HINT:
It is not necessary to depress the pedal continuously, as brake
fluid flows out by first depressing.
(f) Connect LEXUS hand±held tester.
(1) Turn the ignition switch OFF, connect the LEXUS
hand±held tester to DLC3.
(2) Turn the ignition switch ON, and select ºAIR
BLEEDINGº on the LEXUS hand±held tester.
HINT:
Please refer to the LEXUS hand±held tester operator's manual
for further details.

F02851
BR±8
± BRAKEBRAKE FLUID
2116 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(l) Observe the procedure in step (k) and bleed left rear
brake line.
(m) Disconnect the actuator checker (SST) and sub±wire har-
ness (SST) from the actuator.
SST 09990±00150, 09990±00480
(n) Connect the 2 connectors to the hydraulic brake booster.
(o) Clear the DTC (See page DI±389).
4. BLEED BRAKE LINE
(a) Connect the vinyl tube to the brake caliper.
(b) Depress the brake pedal several times, then loosen the
bleeder plug with the pedal held down.
(c) At the point when fluid stops coming out, tighten the
bleeder plug, then release the brake pedal.
(d) Repeat (b) and (c) until all the air in the fluid has been bled
out.
(e) Repeat the above procedure to bleed the brake line for
each wheel.
Torque: 11 N´m (110 kgf´cm, 8 ft´lbf)
5. CHECK FLUID LEVEL IN RESERVOIR
(a) With the ignition switch OFF, depress the brake pedal
more than 40 times.
HINT:
When a pressure in power supply system is released, reaction
force becomes heavy and stroke becomes shorter.
(b) Remove the reservoir cap. Add brake fluid up to the
ºMAXº line.
Fluid: SAE J1703 or FMVSS NO. 116 DOT3

BR0K9±04
F06046
SST
F01655
SST
F06047
BR±50
± BRAKEHYDRAULIC BRAKE BOOSTER
2158 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
NOTICE:

Before starting the work, make sure that the ignition
switch is OFF and depress the brake pedal more than
40 times.

As high pressure is applied to the brake actuator tube
No. 1, never deform it.

Until the work is over, do not turn the ignition switch
ON.
1. DRAW OUT FLUID WITH SYRINGE
NOTICE:
Do not let brake fluid remain on a painted surface. Wash it
off immediately.
2. REMOVE NO. 1 UNDER COVER (See page BO±88)
3. REMOVE END PAD AND NO. 1 SAFETY PAD
4. REMOVE NO. 7 HEATER TO REGISTER DUCT
5. DISCONNECT BRAKE LINES
Using SST, disconnect the 4 brake lines.
SST 09023±00100
Torque: 15 N´m (155 kgf´cm, 11 ft´lbf)
6. DISCONNECT LEFT FRONT WHEEL BRAKE LINE
Using SST, disconnect the left front wheel brake line from the
flexible hose.
SST 09023±00100
Torque: 15 N´m (155 kgf´cm, 11 ft´lbf)
7. REMOVE 2 BRAKE LINE CLAMPS
8. DISCONNECT LEVEL WARNING SWITCH CONNEC-
TOR
9. DISCONNECT 4 CONNECTORS
10. REMOVE PEDAL RETURN SPRING, CLIP AND CLE-
VIS PIN
11. REMOVE HYDRAULIC BRAKE BOOSTER ASSEMBLY
(a) Loosen the lock nut, then remove the clevis and lock nut.
Torque: 25 N´m (260 kgf´cm, 19 ft´lbf)
(b) Remove the 4 booster installation nuts.
Torque: 13 N´m (130 kgf´cm, 9 ft´lbf)
(c) Remove the booster assembly and gasket.

CO09X±03
Z07402
Drain Plug
Drain Plug
B01611
Drain Plug
Rubber
HoseConnect
CO±2
± COOLING (2JZ±GE)COOLANT
1540 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REPLACEMENT
1. DRAIN ENGINE COOLANT
(a) Remove the radiator cap.
CAUTION:
To avoid the danger of being burned, do not remove the ra-
diator cap while the engine and radiator are still hot, as fluid
and steam can be blown out under pressure.
(b) Loosen the 2 drain plugs (for the engine and radiator),
and drain the coolant.
HINT:
To prevent the coolant from spraying over the cylinder block,
connect the rubber hose (inside diameter 6 ± 8 mm) in the mar-
ket to the union pipe under the drain plug.
(c) Close the drain plugs.
Torque: 30 N´m (300 kgf´cm, 22 ft´lbf) for engine
2. FILL ENGINE COOLANT
(a) Slowly fill the system with coolant.

Use of improper coolants may damage engine cool-
ing system.

Use ºToyota Long Life Coolantº or equivalent and
mix it with plain water according to the manufac-
ture's directions.

Use of the coolant which includes more than 50%
[freezing protection down to ±35°C (±31°F)] or 60%
[freezing protection down to ±50°C (±58°F)] of eth-
ylene ±glycol is recommended, but not more than
70%.
NOTICE:

Do not use an alcohol type coolant or plain water
alone.

The coolant should be mixed with plain water (prefer-
able demineralized water or distilled water).
Capacity (w/ Heater):
7.7 liters (8.1 US qts, 6.8 lmp. qts)
(b) Install the radiator cap.
(c) Start the engine, and bleed the cooling system.
(d) Refill the reservoir with coolant until it reaches the ºFULLº
line.
3. CHECK ENGINE COOLANT FOR LEAKS
4. CHECK ENGINE COOLANT SPECIFIC GRAVITY COR-
RECTLY