LEXUS GS400 2000 Service Repair Manual

CO0AE±01
B02030
Electric Cooling
Fan Connector Upper Radiator Hose Air Cleaner Inlet
MAF Meter Connector Air Cleaner and MAF Meter Assembly
Intake Air ResonatorElectric Cooling Fan Assembly
Radiator Reservoir Hose
Wire Clamp ECM Outlet Duct
x 6
EVAP Hose
Engine
Wire Clamp
± COOLING (2JZ±GE)ELECTRIC COOLING FAN
CO±25
1563 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
COMPONENTS

B00918
No.2 Fan Motor
Connector
Holder
Fan Shroud
Assembly
No.1 Fan
No.1 Fan Motor
No.2 Fan
CO±26
± COOLING (2JZ±GE)ELECTRIC COOLING FAN
1564 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

CO0AF±03
B02071
± COOLING (2JZ±GE)ELECTRIC COOLING FAN
CO±27
1565 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. DRAIN ENGINE COOLANT
2. REMOVE AIR CLEANER INLET
3. REMOVE AIR CLEANER AND MAF METER AS-
SEMBLY
4. REMOVE ELECTRIC COOLING FAN
(a) Disconnect the upper radiator hose from the radiator.
(b) Disconnect the ECM outlet duct from the ECM box.
(c) Disconnect the wire for electric cooling fan from the clamp
on the electric cooling fan.
(d) Disconnect the 2 electric cooling fan connector.
(e) Disconnect the radiator reservoir hose from the radiator.
(f) Remove the 6 bolts and electric cooling fan.

CO0AG±01
B00919
B00921
CO±28
± COOLING (2JZ±GE)ELECTRIC COOLING FAN
1566 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
DISASSEMBLY
1. REMOVE FANS
Remove the nut and fan. Remove the 2 fans.
2. REMOVE FAN MOTORS
(a) Disconnect the wires and connector holders from the fan
shroud.
(b) Remove the 3 screws and fan motor. Remove the 2 fan
motors.

CO0AH±01
B00921
B00920
B00919
± COOLING (2JZ±GE)ELECTRIC COOLING FAN
CO±29
1567 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REASSEMBLY
1. INSTALL FAN MOTORS
(a) Install the fan motor with the 3 screws. Install the 2 fan mo-
tors.
(b) Install the wires and connector holders to the fan shroud
as shown in the illustration.
2. INSTALL FANS
Install the fan with the nut. Install the 2 fans.

CO09Y±01
A02724
Air Cleaner Inlet
Upper Radiator Support
MAF Meter Connector Air Cleaner and MAF
Meter AssemblyLower Radiator Hose
Radiator
Assembly
ECM Outlet Duct
ECT
Switch
Engine Wire Clamp EVAP Hose
Lower Radiator Support
Intake Air Resonator
PS Pump
Front Bracket
Water Pump Pulley
Drive Belt
Engine Under CoverPS Vane Pump
Oil Cooler Hose
for A/T Electric Cooling
Fan Connector
Upper Radiator
Hose
x 18
58 (590, 43)
52 (530, 38)
N´m (kgf´cm, ft´lbf)
 Non±reusable part: Specified torqueWire Clamp
Upper Radiator
Support
± COOLING (2JZ±GE)WATER PUMP
CO±3
1541 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
WATER PUMP
COMPONENTS

B01985
Water Bypass Outlet
 O±Ring
Engine Wire
Water
Pump
Connector Bracket
Idler PulleyGasket
Timing Belt GuideNo.2 Water Bypass Pipe
Drain Hose
Timing Belt Tensioner
Timing Belt
Drive Belt TensionerOil Filler Cap
No.3 Timing Belt Cover
No.1 Water
Bypass Pipe
 Gasket
Crankshaft PulleyDust Boot
x 5 Thermostat
 O±Ring
 O±Ring
No.2 Timing Belt Cover
Gasket
No.1 Timing Belt Cover
 Gasket
Water Inlet
x 6
35 (350, 26)
21 (210, 15)
21 (210, 15)
27 (270, 20)

N´m (kgf´cm, ft´lbf) : Specified torque
 Non±reusable part

Precoated part
330 (3,300, 243)
Clamp Bracket
Crankshaft Position
Sensor Connector
Gasket
CO±4
± COOLING (2JZ±GE)WATER PUMP
1542 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

CO0AI±03
B02071
CO±30
± COOLING (2JZ±GE)ELECTRIC COOLING FAN
1568 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
1. INSTALL ELECTRIC COOLING FAN
(a) Install the electric cooling fan with the 6 bolts.
Torque: 5.0 N´m (50 kgf´cm, 44 in.´lbf)
(b) Connect the upper radiator hose to the radiator.
(c) Connect the ECM outlet duct to the ECM box.
(d) Connect the wire for electric cooling fan to clamp on the
electric cooling fan.
(e) Connect the 2 electric cooling fan connectors.
(f) Connect the radiator reservoir hose to the radiator.
2. INSTALL AIR CLEANER AND MAF METER AS-
SEMBLY
3. INSTALL AIR CLEANER INLET
4. FILL WITH ENGINE COOLANT
5. START ENGINE AND CHECK FOR COOLANT LEAKS

B02035
ECT Switch
Connector
ECT
Switch
O±Ring
CO0AJ±01
P05962
Ohmmeter
± COOLING (2JZ±GE)ENGINE COOLANT TEMPERATURE (ECT) SWITCH
CO±31
1569 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
ENGINE COOLANT
TEMPERATURE (ECT) SWITCH
INSPECTION
1. DRAIN ENGINE COOLANT
2. REMOVE ECT SWITCH
(a) Disconnect the connector.
(b) Remove the ECT switch.
(c) Remove the O±ring from the ECT switch.
3. INSPECT ECT SWITCH
(a) Using an ohmmeter, check that there is no continuity be-
tween the terminals when the coolant temperature is
above 93°C (199°F).
If there is continuity, replace the switch.
(b) Using an ohmmeter, check that there is continuity be-
tween the terminals when the coolant temperature is be-
low 83°C (181°F).
If there is no continuity, replace the switch.
4. REINSTALL ECT SWITCH
(a) Install a new O±ring to the ECT switch.
(b) Install the ECT switch.
(c) Connect the connector.
5. REFILL WITH ENGINE COOLANT
6. START ENGINE AND CHECK FOR COOLANT LEAKS

B01376
Radiator
Fan Main
RelayCO0AK±01
B00019
Ohmmeter
Continuity
OhmmeterOhmmeter
No Continuity
Continuity21
5
43
B00020
Ohmmeter Ohmmeter
No Continuity
Continuity 2
1
5
43
Battery
CO±32
± COOLING (2JZ±GE)RADIATOR FAN MAIN RELAY
1570 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
RADIATOR FAN MAIN RELAY
INSPECTION
1. REMOVE RELAY BOX COVER
2. REMOVE RADIATOR FAN MAIN RELAY (Marking:
RAD FAN MAIN)
3. INSPECT RADIATOR FAN MAIN RELAY
(a) Inspect the relay continuity.
(1) Using an ohmmeter, check that there is continuity
between terminals 3 and 5.
If there is no continuity, replace the relay.
(2) Check that there is continuity between terminals 2
and 4.
If there is no continuity, replace the relay.
(3) Check that there is no continuity between terminals
1 and 2.
If there is continuity, replace the relay.
(b) Inspect the relay operation.
(1) Apply battery positive voltage across terminals 3
and 5.
(2) Using an ohmmeter, check that there is no continu-
ity between terminals 2 and 4.
If there is continuity, replace the relay.
(3) Check that there is continuity between terminals 1
and 2.
If there is no continuity, replace the relay.
4. REINSTALL RADIATOR FAN MAIN RELAY
5. REINSTALL RELAY BOX COVER