LEXUS GS400 2000 Service Repair Manual

Z00040
SST (C)
Turn
P10836
SST (B)SST (A) Turn
B01648
Wire
Clip
B02021
SST
CH±8
± CHARGING (2JZ±GE)GENERATOR
1610 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(c) Mount SST (C) in a vise.
(d) Insert SST (B) into SST (C), and attach the pulley nut to
SST (C).
(e) To loosen the pulley nut, turn SST (A) in the direction
shown in the illustration.
NOTICE:
To prevent damage to the rotor shaft, do not loosen the
pulley nut more than one±half of a turn.
(f) Remove the generator from SST (C).
(g) Turn SST (B), and remove SST (A and B).
(h) Remove the pulley nut and pulley.
5. REMOVE RECTIFIER END FRAME
(a) Remove the 4 nuts and wire clip.
(b) Using SST, remove the rectifier end frame.
SST 09950±40011 (09951±04020, 09952±04010,
09953±04030, 09954±04010, 09955±04041)
(c) Remove the generator washer.
6. REMOVE ROTOR FROM DRIVE END FRAME

CH047±01
B03131
Ohmmeter
Continuity
B03132
Ohmmeter
No Continuity
CH1023
B01948
Continuity
Ohmmeter
B01949
Ohmmeter No Continuity
± CHARGING (2JZ±GE)GENERATOR
CH±9
1611 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. INSPECT ROTOR
(a) Check rotor for open circuit.
Using an ohmmeter, check that there is continuity be-
tween the slip rings.
Standard resistance: 2.2 ± 2.4 W at 20°C (68°F)
If there is no continuity, replace the rotor.
(b) Check the rotor for ground.
Using an ohmmeter, check that there is no continuity be-
tween the slip ring and rotor.
If there is continuity, replace the rotor.
(c) Check that the slip rings are not rough or scored.
If rough or scored, replace the rotor.
(d) Using vernier calipers, measure the slip ring diameter.
Standard diameter: 14.2 ± 14.4 mm (0.559 ± 0.567 in.)
Minimum diameter: 12.8 mm (0.504 in.)
If the diameter is less than minimum, replace the rotor.
2. INSPECT STATOR (DRIVE END FRAME)
(a) Check the stator for open circuit.
Using an ohmmeter, check that there is continuity be-
tween the coil leads.
If there is no continuity, replace the drive end frame assembly.
(b) Check the stator for ground.
Using an ohmmeter, check that there is no continuity be-
tween the coil lead and drive end frame.
If there is continuity, replace the drive end frame assembly.

P13535
Length
B01954
Ohmmeter
Positive (+)
Terminal
Rectifier
Terminal
B01933
Ohmmeter
Negative (±) Terminal
CH±10
± CHARGING (2JZ±GE)GENERATOR
1612 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
3. INSPECT BRUSHES
Using vernier calipers, measure the exposed brush length.
Standard exposed length:
9.5 ± 11.5 mm (0.374 ± 0.453 in.)
Minimum exposed length: 1.5 mm (0.059 in.)
If the exposed length is less than minimum, replace the brush
holder assembly.
4. INSPECT RECTIFIERS (RECTIFIER HOLDER)
(a) Check the positive (+) rectifier.
(1) Using an ohmmeter, connect one tester prob to the
positive (+) terminal and the other to each rectifier
terminal.
(2) Reverse the polarity of the tester probes and repeat
step (a).
(3) Check that one shows continuity and the other
shows no continuity.
If continuity is not as specified, replace the rectifier holder.
(b) Check the negative (±) rectifier.
(1) Using an ohmmeter, connect one tester probe to
each negative (±) terminal and the other to each
rectifier terminal.
(2) Reverse the polarity of the tester probes and repeat
step (a).
(3) Check that one shows continuity and the other
shows no continuity.
If continuity is not as specified, replace the rectifier holder.
5. INSPECT BEARING
Check the bearing is not rough or worn.
If necessary, replace the bearing. (See page CH±11)

CO09W±03
± COOLING (2JZ±GE)COOLANT
CO±1
1539 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
COOLANT
INSPECTION
1. CHECK ENGINE COOLANT LEVEL AT RESERVOIR
The engine coolant level should be between the ºLOWº and ºFULLº lines, when the engine is cold.
If low, check for leaks and add ºToyota Long Life Coolantº or equivalent up to the ºFULLº line.
2. CHECK ENGINE COOLANT QUALITY
There should not be any excessive deposits of rust or scale around the radiator cap or radiator filler hole,
and the coolant should be free from oil.
If excessively dirty, replace the coolant.

CO0A2±03
B01987
Thermostat

Gasket Water Inlet

Non±reusable part
CO±10
± COOLING (2JZ±GE)THERMOSTAT
1548 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
THERMOSTAT
COMPONENTS

CO0A3±01
B01940
± COOLING (2JZ±GE)THERMOSTAT
CO±11
1549 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
HINT:
Removal of the thermostat would have an adverse effect, caus-
ing a lowering of cooling efficiency. Do not remove the thermo-
stat, even if the engine tends to overheat.
1. DRAIN ENGINE COOLANT
2. DISCONNECT WATER INLET FROM WATER PUMP,
AND REMOVE THERMOSTAT
(a) Remove the 2 nuts holding the water inlet to the water
pump, and disconnect the water inlet from the water
pump.
(b) Remove the thermostat.
(c) Remove the gasket from the thermostat.

CO0A4±01
P 1111 6
CO0601
P03242
Valve
Lift CO±12
± COOLING (2JZ±GE)THERMOSTAT
1550 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
INSPECT THERMOSTAT
HINT:
The thermostat is numbered with the valve opening tempera-
ture.
(a) Immerse the thermostat in water and gradually heat the
water.
(b) Check the valve opening temperature.
Valve opening temperature: 80 ± 84°C (176 ± 183°F)
If the valve lift is not as specified, replace the thermostat.
(c) Check the valve lift.
Valve lift: 8.5 mm (0.335 in.) or more at 95°C (203°F)
If the valve lift is not as specified, replace the thermostat.
(d) Check that the valve is fully closed when the thermostat
is at low temperatures (below 40°C (104°F)).
If not closed, replace the thermostat.

CO0A5±01
P 1111 7
ProtrusionJiggle Valve
± COOLING (2JZ±GE)THERMOSTAT
CO±13
1551 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
1. PLACE THERMOSTAT IN WATER INLET
(a) Install a new gasket to the thermostat.
(b) Align the jiggle valve of the thermostat with the protrusion
of the water inlet.
2. INSTALL WATER INLET
Install the water inlet with the 2 nuts.
Torque: 9.0 N´m (90 kgf´cm, 80 in.´lbf)
3. FILL WITH ENGINE COOLANT
4. START ENGINE AND CHECK FOR COOLANT LEAKS

CO0A6±01
CO±14
± COOLING (2JZ±GE)RADIATOR
1552 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
RADIATOR
ON±VEHICLE CLEANING
CLEAN RADIATOR
Using water or a steam cleaner, remove any mud or dirt from the radiator core.
NOTICE:
If using a high pressure type cleaner, be careful not to deform the fins of the radiator core. (i.e. Main-
tain a distance between the cleaner nozzle and radiator core.)

CO0A7±01
CO1242
Radiator Cap Tester
Radiator Cap
30° or More
B01882
Radiator Cap Tester
± COOLING (2JZ±GE)RADIATOR
CO±15
1553 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
ON±VEHICLE INSPECTION
1. REMOVE RADIATOR CAP
Remove the radiator cap from the radiator.
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.
2. INSPECT RADIATOR CAP
NOTICE:

If the radiator cap has contaminations, always rinse
it with water.

Before using a radiator cap tester, wet the relief valve
and pressure valve with engine coolant or water.

When performing steps (a) and (b) below, keep the
tester at an angle of over 30° above the horizontal.
(a) Using a radiator cap tester, slowly pump the tester and
check that air is coming from the vacuum valve.
Pump speed: 1 push/(3 seconds or more)
NOTICE:
Push the pump at a constant speed.
If air is not coming from the vacuum valve, replace the radiator
cap.
(b) Pump the radiator cap tester, and measure the relief valve
opening pressure.
Pump speed: 1 push within 1 second
NOTICE:
This pump speed is for the first pump only (in order to close
the vacuum valve). After this, the pump speed can be re-
duced.
Standard opening pressure:
93 ± 123 kPa (0.95 ± 1.25 kgf/cm
2, 13.5 ± 17.8 psi)
Minimum opening pressure:
78 kPa (0.8 kgf/cm
2, 11.4 psi)
HINT:
Use the tester's maximum reading as the opening pressure.
If the opening pressure is less than minimum, replace the radia-
tor cap.
3. INSPECT COOLING SYSTEM FOR LEAKS
(a) Fill the radiator with coolant and attach a radiator cap tes-
ter.
(b) Warm up the engine.
(c) Pump it to 118 kPa (1.2 kgf/cm
2, 17.1 psi), and check that
the pressure does not drop.
If the pressure drops, check the hoses, radiator or water pump
for leaks. If no external leaks are found, check the heater core,
cylinder block and head.
4. REINSTALL RADIATOR CAP