2000 LEXUS GS400 cooling

CO0A1±03
P03945
New
O±Ring
P02574
New Gasket
A02801
AB A
B
A
B
B
B
B01614
New O±Ring
CO±8
± COOLING (2JZ±GE)WATER PUMP
1546 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
1. INSTALL WATER PUMP
(a) Install a new O±ring to the cylinder block.
(b) Install the drain hose.
(c) Install a new gasket to the water pump.
(d) Connect the water pump to the water bypass pipe. Do not
install the nut yet.
(e) Install the water pump with the 2 bolts (A) and 4 bolts (B).
Torque: 21 N´m (210 kgf´cm, 15 ft´lbf)
HINT:
Hand tighten the (A) bolts first.
(f) Install the 2 nuts holding the No.2 water bypass pipe to
the water pump.
Torque: 21 N´m (210 kgf´cm, 15 ft´lbf)
(g) Install the connector bracket (for crankshaft position sen-
sor connector) with the bolt.
(h) Install the clamp bracket (for engine wire) with the bolt.
(i) Install the generator with the bolt and nut.
Torque: 40 N´m (400 kgf´cm, 30 ft´lbf)
2. INSTALL THERMOSTAT AND WATER INLET
(See page CO±13)
3. INSTALL NO.1 WATER BYPASS PIPE AND WATER
BYPASS OUTLET
(a) Install 2 new O±rings to the No.1 water bypass pipe.
(b) Install a new O±ring and the water bypass outlet with the
2 bolts.
Torque: 9.0 N´m (90 kgf´cm, 80 in.´lbf)
4. INSTALL IDLER PULLEY AND TIMING BELT
(See page EM±23)
5. INSTALL WATER PUMP PULLEY AND DRIVE BELT
Torque: 14 N´m (140 kgf´cm, 10 ft´lbf)

± COOLING (2JZ±GE)WATER PUMP
CO±9
1547 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
6. INSTALL RADIATOR ASSEMBLY
(See page CO±23)

EM0D5±03
A09758
Air Cleaner Inlet
Air Cleaner, MAF Meter and Intake
Air Resonator Assembly
PCV Hose
MAF Meter
Connector
PS Air Hose
Engine Wire
Clamp
EVAP HoseRadiator Assembly
Lower Radiator Hose
Upper Radiator Support
ECM
Outlet Duct
Wire Clamp
ECT Switch
Connector
Electric
Cooling Fan
Connector
Oil Cooler Hose
for A/T Accelerator Cable
PS Vane Pump
PS Pump
Front Bracket
Drive Belt
Engine Under Cover
N´m (kgf´cm, ft´lbf) : Specified torque
 Non±reusable Part
Lower Radiator
Support
Upper Radiator Hose
58 (590, 43)
52 (530, 38)
x 18
Engine Cover EM±14
± ENGINE MECHANICAL (2JZ±GE)TIMING BELT
1368 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
TIMING BELT
COMPONENTS

EM0DG±03
A09759
Air Cleaner,
MAF Meter and
Intake Air Resonator
Assembly
PCV Hose
Hood SupportHood
MAF Meter
Connector
Engine Wire
ClampWasher Hose
Accelerator Cable PS Air Hose
EVAP Hose
Air Cleaner Inlet
Radiator Lower Hose
Engine Under CoverFront Suspension
Member Brace x 6
x 18 Radiator Upper Hose
Upper Radiator
Drive Belt
ECM Outlet Duct
ECT Switch Connector
Connector
Radiator Assembly Radiator Lower Support
Oil Cooler Hose for A/TEVAP Hose
Heater
Hose
Support
Electric Cooling Fan Engine Cover
± ENGINE MECHANICAL (2JZ±GE)ENGINE UNIT
EM±59
1413 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
ENGINE UNIT
COMPONENTS

DTC No.
Indicates the diagnostic trouble code.

Page or Instructions
Indicates the page where the inspection procedure
for each circuit is to be found, or gives instructions
for checking and repairs.

Detection Item
Indicates the system of the problem or
contents of the problem.
Trouble Area
Indicates the suspect area of the
problem.
Mass Air Flow Circuit MalfunctionDetection Item

Open or short in mass air flow meter circuit

Mass air flow meter

ECM DTC No.
(See page)Trouble AreaMIL* MemoryP0100
(DI±24)
P0101
(DI±28)
P0115
(DI±33)
Open or short in intake air temp. sensor
circuit

Intake air temp. sensor

ECM Intake Air Temp. Circuit
Malfunction P0110
(DI±29)

Open or short in engine coolant temp. sensor circuit

Engine coolant temp. sensor

ECM
Throttle/ Pedal Position Sensor/Switch
ºAº Circuit MalfunctionEngine Coolant Temp.
Circuit Malfunction

Open or short in throttle position sensor circuit

Throttle position sensor

ECM
DTC CHART (SAE Controlled)
HINT:
Parameters listed in the chart may not be exactly the same as your reading due to the type of instrument or other
factors.
If a malfunction code is displayed during the DTC check mode, check the circuit for that code listed in the table
below. For details of each code, turn to the page referred to under the ºSee pageº for the respective ºDTC No.º
in the DTC chart.
Mass Air Flow Circuit
Range/ Performance Problem
Mass air flow meter

Throttle position sensor Throttle/ Pedal Position Sensor/ Switch
ºAº Circuit Range / Performance Prob-
lem P0116
(DI±37)Engine Coolant Temp.
Circuit Range/ Performance Problem
Engine coolant temp. sensor

Cooling system
± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMSIN±27
27 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
4. DIAGNOSTIC TROUBLE CODE CHART
The inspection procedure is shown in the table below. This table permits efficient and accurate troubleshoot-
ing using the diagnostic trouble codes displayed in the diagnostic trouble code check. Proceed with trouble-
shooting in accordance with the inspection procedure given in the diagnostic chart corresponding to the
diagnostic trouble codes displayed. The engine diagnostic trouble code chart is shown below as an example.

PP0TK±01
±
PP±13
65 Author: Date:
COOLING (2JZ±GE)
SST (Special Service Tools)
09230±01010Radiator Service Tool Set
09231±14010Punch

SS0FM±01
±
SS±13
169 Author: Date:
COOLING (2JZ±GE)
SERVICE DATA
ThermostatValve opening temperature
Valve lift at 95°C (203°F)80 ± 84°C (176 ± 183°F)
8.5 mm (0.335 in.) or more
Radiator capRelief valve opening pressure STD
Minimum93 ± 123 kPa (0.95 ± 1.25 kgf/cm2, 13.5 ± 17.8 psi)
78 kPa (0.8 kgf/cm2, 11.4 psi)
Electric
cooling fanRotating amperage at 20°C (68°F)8.5 ± 11.5 A

SS0FN±01
SS±14
±
170 Author: Date:
TORQUE SPECIFICATION
Part tightenedN´mkgf´cmft´lbf
Engine drain plug x Cylinder block3030022
Water pump x Cylinder block2121015
Water pump x No.2 water bypass pipe2121015
Generator x Water pump4040030
Generator x Cylinder block4040030
Water bypass outlet x Cylinder head9.09080 in.´lbf
Water pump pulley x Water pump1414010
Water inlet x Water pump9.09080 in.´lbf
Oil cooler x Radiator lower tank8.38574 in.´lbf
Oil cooler x Oil cooler pipe14.715011
Upper radiator support x Body13.513510
Electric cooling fan x Radiator5.05044 in.´lbf