sensor LEXUS GS400 2000 Service Manual PDF

B06793Air
Purge Port
EVAP
Port
Air Drain PortAir Inlet Port
B06794
Vacuum
Purge Port
Air Inlet Port
B06795Vacuum
Purge Port
EVAP
Port Air Inlet Port
± EMISSION CONTROL (2JZ±GE)EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM
EC±11
1462 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(3) While holding the purge port and the air drain port
closed, blow air (1.76 kPa, 18 gf/cm
2, 0.26 psi) into
the EVAP port and check that air does not flow from
the air inlet port.
(4) Apply vacuum (3.43 kPa, 25.7 mmHg, 1.01 in.Hg)
to the purge port, check that the vacuum does not
decrease when the air inlet port is closed, and
check that the vacuum decreases when the air inlet
port is released.
(5) While holding the air inlet port closed, apply vacuum
(3.43 kPa, 25.7 mmHg, 1.01 in.Hg) to the EVAP port
and check that air flows into the purge port.
If operation is not as specified, replace the charcoal canister.
10. INSPECT VSV FOR EVAP
(See page SF±52)
11. INSPECT VSV FOR VAPOR PRESSURE SENSOR
(See page SF±57)
12. INSPECT VAPOR PRESSURE SENSOR
(See page SF±61)
13. REINSTALL CHARCOAL CANISTER ASSEMBLY
(a) Install the charcoal canister assembly.
(b) Connect the RH rear drive shaft to the differential.
(See page SA±59)

EM±2
± ENGINE MECHANICAL (2JZ±GE)CO/HC
1356 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
If the CO/HC concentration does not comply with regulations,
troubleshoot in the order given below.
(a) Check heated oxygen sensors operation.
(See page DI±44)
(b) See the table below for possible causes, and then inspect
and correct the applicable causes if necessary.
HCCOPhenomenonCauses
HighNormalRough idle1. Faulty ignitions:

Incorrect timing

Fouled, shorted or improperly gapped plugs

Open or crossed high±tension cords
2. Incorrect valve clearance
3. Leaky intake and exhaust valves
4. Leaky cylinder
HighLowRough idle
(Fluctuating HC reading)1. Vacuum leaks:

PCV hose

Intake manifold

Throttle body

Cylinder head gasket
2. Lean mixture causing misfire
HighHighRough idle
(Black smoke from exhaust)1. Restricted air filter
2. Plugged PCV valve
3. Faulty SFI systems:

Faulty pressure regulator

Faulty ECM

Faulty injector

Faulty throttle position sensor

Faulty mass air flow meter

A11128
Accelerator Pedal Position Sensor Connector
Throttle Control Motor Connector
Throttle Body and Intake Air Connector Assembly
Water Bypass HoseVSV Connector
for EVAP
EVAP Hose
 Gasket Air Assist Hose Engine Wire
Oil Filler Cap
No.3 Timing Belt Cover
Gasket
No.2 Timing Belt Cover
GasketThrottle
Position
Sensor
Connector
Vacuum Hose
(from Actuator for ACIS)
Water Bypass Hose
Engine Wire Protector
High±Tension
Cord w/ Clamp
No.1 Cylinder
Head Cover
Gasket
Timing Belt
x 6
Timing Belt Guide
Gasket
x 5 No.1 Timing Belt Cover
Crankshaft
Pulley
21 (210, 15)
Drive Belt Tensioner
330 (3,300, 243)
Camshaft
Timing Pulley
(VVT±i Pulley)81 (810, 60)
Straight
Screw Plug
15 (150, 11)Seal Washer
Camshaft
Timing Oil
Control Valve
Camshaft Timing
Oil Control
Valve Connector Gasket
Oil Control Valve Filter
 O±Ring
No.1 Oil PipeUnion Bolt
55 (550, 41)
Idler Pulley
Crankshaft Timing Pulley
Timing Belt Plate
Timing Belt Tensioner
N´m (kgf´cm, ft´lbf) : Specified torque
35 (350, 26)

8.0 (80, 71 in.´lbf)
27 (270, 20)
 Non±reusable part

Precoated part
Dust Boot
Engine Wire ClampPCV Hose
Vacuum Hose
(from No.2
Vacuum Pipe)
± ENGINE MECHANICAL (2JZ±GE)TIMING BELT
EM±15
1369 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

A02642
A02719
10 mm
Hexagon
Wrench
A02746
SST
Bolt
EM±20
± ENGINE MECHANICAL (2JZ±GE)TIMING BELT
1374 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
22. REMOVE TIMING BELT
HINT:
(When re±using timing belt):
Draw an arrow on the timing belt in the direction of engine revo-
lution, and place matchmarks on the timing belt and crankshaft
timing pulley.
23. REMOVE IDLER PULLEY
Using a 10 mm hexagon wrench, remove the pivot bolt, plate
washer and idler pulley.
24. REMOVE CRANKSHAFT TIMING PULLEY
(a) Remove the bolt and timing belt plate.
(b) Remove the crankshaft timing pulley.
If the pulley cannot be removed by hand, use SST and bolt (di-
ameter: 8 mm, pitch: 1.5 mm) to remove the crankshaft timing
pulley.
SST 09950±50012 (09951±05010, 09952±05010,
09953±05020, 09954±05010)
Bolt: Part No. 90119±18001
NOTICE:

Do not scratch the sensor part the crankshaft timing
pulley.

Do not turn the timing pulley.

EM0D8±04
A02644
Inward
A02720
A0264110 mm Hexagon Wrench
Adhesive
A02658
Timing
Mark
Dot Mark
A02642
± ENGINE MECHANICAL (2JZ±GE)TIMING BELT
EM±23
1377 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
1. INSTALL CRANKSHAFT TIMING PULLEY
(a) Align the pulley set key with the key groove of the pulley.
(b) Slide on the timing pulley facing the flange side inward.
NOTICE:
Do not scratch the sensor part of the crankshaft timing
pulley.
(c) Install the timing belt plate with the bolt.
Torque: 8.0 N´m (80 kgf´cm, 71 in.´lbf)
2. INSTALL IDLER PULLEY
(a) Apply adhesive to 2 or 3 threads of the pivot bolt.
Adhesive:
Part No. 08833±00080, THREE BOND 1344,
LOCTITE 242 or equivalent
(b) Using a 10 mm hexagon wrench, install the plate washer
and pulley with the pivot bolt.
Torque: 35 N´m (350 kgf´cm, 26 ft´lbf)
(c) Check that the pulley bracket moves smoothly.
3. TEMPORARILY INSTALL TIMING BELT
NOTICE:
The engine should be cold.
(a) Use the crankshaft pulley bolt to turn the crankshaft, and
align the dot mark on the crankshaft timing pulley and the
timing mark on the oil pump body.
(b) Remove any oil or water on the crankshaft timing pulley
and idler pulley, and keep them clean.
(c) Install the timing belt on the crankshaft timing pulley and
idler pulley.
HINT:
When re±using timing belt:
Align the matchmarks of the crankshaft timing pulley and timing
belt, and install the belt with the arrow pointing in the direction
of engine revolution.

EM0D9±04
A09751
Air Cleaner,
MAF Meter
and Intake Air
Resonator
Assembly
PCV HoseExhaust Manifold
Case Clamp
PS Air
Hose
EVAP Hose
Air Cleaner InletMAF Meter
Connector
Heated Oxygen Sensor
Connector
 Clamp
40 (408, 32)
x 8
 Gasket
44 (440, 32)
44 (440, 32)
Pipe Support Bracket
Accelerator Cable
 Gasket
Upper Radiator
Hose
Front Exhaust Pipe
Drive Belt
Engine Under Cover
x 18
N´m (kgf´cm, ft´lbf) : Specified torque
 Non±reusable Part
Engine Cover
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
EM±29
1383 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
CYLINDER HEAD
COMPONENTS

A02822
 Oil Seal
 Non±reusable part

Precoated part


 Gasket Gasket
ECT Sensor
 Valve Guide Bushing
Valve
Water Outlet with Water Bypass Hose
Camshaft Position SensorEngine Hanger Heater Union
Cylinder HeadSpring Seat Valve Spring Spring RetainerKeeper
Adjusting Shim
Valve Lifter
EM±32
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
1386 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

EM0DA±03
A02823
A02802
B01935
Wire
Grommet
Clamp
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
EM±33
1387 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. REMOVE ENGINE UNDER COVER
2. DRAIN ENGINE COOLANT
3. DISCONNECT UPPER RADIATOR HOSE FROM WA-
TER OUTLET
4. REMOVE ENGINE COVER
Remove the 4 nuts and engine cover.
5. REMOVE AIR CLEANER INLET
6. REMOVE AIR CLEANER, MAF METER AND INTAKE
AIR RESONATOR ASSEMBLY (See page EM±62)
7. REMOVE DRIVE BELT (See page CH±1)
8. DISCONNECT PS PUMP WITHOUT DISCONNECTING
HOSES
(a) Disconnect the PS air hose from the No.4 timing belt cov-
er.
(b) Disconnect the PS air hose from the air intake chamber.
(c) Remove the 2 bolts and pump rear stay.
(d) Remove the 2 bolts, and disconnect the vane pump from
the pump bracket.
HINT:
Put aside the vane pump, and suspend it.
9. DISCONNECT FRONT EXHAUST PIPE FROM EX-
HAUST MANIFOLD
(a) Disconnect the wire grommet and sensor wire of the
heated oxygen sensor (bank 2 sensor 2) from the hole
and clamp on the floor.

A02819
A09752
A02735
EM±34
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
1388 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(b) Remove the 3 bolts and nuts holding the front exhaust
pipe to the exhaust manifold.
(c) Remove the 2 bolts and pipe support bracket.
(d) Disconnect the front exhaust pipe from the exhaust man-
ifold, and remove the 2 gaskets.
10. REMOVE EXHAUST MANIFOLD
(a) Disconnect the 3 heated oxygen sensor connectors and
clamp.
(b) Remove the clamp and case clamp.
(c) Using a 14 mm deep socket wrench, remove the 8 nuts,
exhaust manifold and 2 gaskets.
11. REMOVE WATER BYPASS OUTLET AND NO.1
WATER BYPASS PIPE (See page CO±11)
12. REMOVE THROTTLE BODY AND INTAKE AIR
CONNECTOR ASSEMBLY (See page EM±5)
13. REMOVE OIL DIPSTICK AND GUIDE FOR ENGINE
(See page LU±6)
14. REMOVE OIL DIPSTICK AND GUIDE FOR A/T
(See page EM±62)
15. REMOVE AIR INTAKE CHAMBER (See page SF±46)
16. REMOVE VACUUM CONTROL VALVE SET AND NO.2
VACUUM PIPE
(a) Disconnect the VSV connector for the ACIS.
(b) Remove the 3 nuts, vacuum control valve set and No.2
vacuum pipe.
(c) Disconnect the engine wire clamp from the clamp bracket
of the No.2 vacuum pipe.
17. REMOVE NO.3 TIMING BELT COVER
18. REMOVE IGNITION COILS AND HIGH±TENSION
CORD SET ASSEMBLY (See page IG±7)
19. REMOVE SPARK PLUGS

A02732
(a)
(b) (c)
(d)(d)
(c) (b)
A02811
A02733
Clamp Bracket
A11123
5 mm
Hexagon
Wrench
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
EM±35
1389 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
20. DISCONNECT ENGINE WIRE FROM CYLINDER HEAD
(a) Disconnect the ground strap from the cylinder head.
(b) Disconnect the 2 water bypass hoses from the hose
clamps on the cylinder head and oil filter bracket.
(c) Remove the 2 bolts and hose clamps.
(d) Disconnect the heated oxygen sensor (bank 2 sensor 1)
connector and engine wire clamp from the hose clamps.
(e) Disconnect the heated oxygen sensor (bank 1 sensor 1)
connector.
(f) Disconnect the crankshaft position sensor connector.
(g) Disconnect the generator connector.
(h) Remove the bolt and clamp bracket, and disconnect the
engine wire from the water pump.
(i) Disconnect the 2 ground terminals from the intake man-
ifold.
(j) Disconnect the 2 engine wire clamps from the No.1 oil
pipe and clamp bracket on the intake manifold.
(k) Remove the bolt and clamp bracket.
(l) Disconnect the ECT sensor connector.
(m) Remove the 2 knock sensor connectors.
(n) Remove the oil pressure switch connector.
(o) Remove the oil level sensor connector.
(p) Remove the starter connector.
(q) Remove the 6 injector connectors.
(r) Remove the camshaft timing oil control valve connector.
(s) Remove the camshaft position sensor connector.
(t) Using a 5 mm hexagon wrench, remove the bolt holding
the engine wire protector to the No.2 cylinder head cover.
(u) Remove the 3 nuts, and disconnect the engine wire pro-
tector from the intake manifold.
21. REMOVE FUEL PRESSURE PULSATION DAMPER
(See page SF±26)