2000 LEXUS GS400 Service Repair Manual

EM0D0±01
A00982
CO/HC Meter
± ENGINE MECHANICAL (2JZ±GE)CO/HC
EM±1
1355 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
CO/HC
INSPECTION
HINT:
This check is used only to determine whether or not the idle
CO/HC complies with regulations.
1. INITIAL CONDITIONS
(a) Engine at normal operating temperature
(b) Air cleaner installed
(c) All pipes and hoses of air induction system connected
(d) All accessories switched OFF
(e) All vacuum lines properly connected
(f) SFI system wiring connectors fully plugged
(g) Ignition timing checked correctly
(h) Transmission in neutral position
(i) Tachometer and CO/HC meter calibrated by hand
2. START ENGINE
3. RACE ENGINE AT 2,500 RPM FOR APPROX. 180
SECONDS
4. INSERT CO/HC METER TESTING PROBE AT LEAST
40 cm (1.3 ft) INTO TAILPIPE DURING IDLING
5. IMMEDIATELY CHECK CO/HC CONCENTRATION AT
IDLE AND/OR 2,500 RPM
HINT:
When doing the 2 mode (2,500 rpm and idle) test, follow the
measurement order prescribed by the applicable local regula-
tions.

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

B01982
LEXUS
Hand±Held
Tester
EM0D3±02
A02667
TC
E1 SST
DLC1
A02668
Igniter
White Lead Wire
A02637
EM±12
± ENGINE MECHANICAL (2JZ±GE)IGNITION TIMING
1366 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
IGNITION TIMING
INSPECTION
1. WARM UP ENGINE
Allow the engine to warm up to normal operating temperature.
2. CONNECT LEXUS HAND±HELD TESTER OR OBDII
SCAN TOOL
(a) Connect the LEXUS hand±held tester or OBDII scan tool
to the DLC3.
(b) Please refer to the LEXUS hand±held tester or OBDII
scan tool operator's manual for further details.
3. CONNECT TIMING LIGHT TO ENGINE
4. CHECK IDLE SPEED (See page EM±13)
5. INSPECT IGNITION TIMING
(a) Using SST, connect terminals TC and E1 of the DLC1.
SST 09843±18020
(b) Connect the timing light clip to the white lead wire.
NOTICE:
Use a timing light that can detect the primary signal.
(c) Using a timing light, check the ignition timing.
Ignition timing: 10 ± 2° BTDC @ idle
(Transmission in neutral position)
(d) Remove the SST from the DLC1.
6. FURTHER CHECK IGNITION TIMING
Ignition timing: 6 ± 16° BTDC @ idle
(Transmission in neutral position)
HINT:
The timing mark moves in a range between 6° and 16°.
7. DISCONNECT TIMING LIGHT FROM ENGINE
8. DISCONNECT LEXUS HAND±HELD TESTER OR
OBDII SCAN TOOL

EM0D4±01
± ENGINE MECHANICAL (2JZ±GE)IDLE SPEED
EM±13
1367 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
IDLE SPEED
INSPECTION
1. INITIAL CONDITIONS
(a) Engine at normal operating temperature
(b) Air cleaner installed
(c) All pipes and hoses of air induction system connected
(d) All accessories switched OFF
(e) All vacuum lines properly connected
(f) SFI system wiring connectors fully plugged
(g) Ignition timing checked correctly
(h) Transmission in neutral position
2. CONNECT LEXUS HAND±HELD TESTER OR OBDII SCAN TOOL (See page EM±12)
3. INSPECT IDLE SPEED
(a) Race the engine speed at 2,500 rpm for approx. 90 seconds.
(b) Check the idle speed.
Idle speed: 700 ± 50 rpm
If the idle speed is not as specified, check the throttle body.
4. DISCONNECT LEXUS HAND±HELD TESTER OR OBDII SCAN TOOL

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

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)

EM0D6±04
A01482
A02663
5 mm Hexagon Wrench
A02649
A02690
SST
EM±16
± ENGINE MECHANICAL (2JZ±GE)TIMING BELT
1370 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. REMOVE ENGINE UNDER COVER
2. DRAIN ENGINE COOLANT
3. REMOVE RADIATOR ASSEMBLY (See page CO±18)
4. REMOVE DRIVE BELT (See page CH±1)
5. REMOVE PS PUMP AND FRONT BRACKET
(a) Remove the 3 bolts, plate washer and pump front bracket.
(b) Disconnect the vane pump from the bracket.
6. REMOVE NO.3 TIMING BELT COVER
Using a 5 mm hexagon wrench, remove the 4 bolts, oil filler cap,
timing belt cover and gasket.
7. REMOVE NO.2 TIMING BELT COVER
Using a 5 mm hexagon wrench, remove the 3 bolts, timing belt
cover and gasket.
8. REMOVE DRIVE BELT TENSIONER
Remove the 3 bolts and tensioner.
NOTICE:
Be careful not to drop the bolts inside the timing belt cover.
9. LOOSEN CRANKSHAFT PULLEY BOLT
Using SST, loosen the pulley bolt.
SST 09213 ± 70010, 09330 ± 00021

A02656
A02671
Timing MarkSub Timing Mark
60°
Turn
A02660
Dot
Mark
30°Timing
MarkDot
Mark
30°Timing
Mark
A02653
± ENGINE MECHANICAL (2JZ±GE)TIMING BELT
EM±17
1371 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
10. SET NO.1 CYLINDER TO APPROX. 60°/ BTDC COM-
PRESSION
(a) Turn the crankshaft pulley, and align its groove with timing
mark º0º of the No.1 timing belt cover.
NOTICE:
Always turn the crankshaft clockwise.
(b) Check that the timing marks (TDC mark) of the camshaft
timing pulleys are aligned with the timing marks of the
No.4 timing belt cover.
If not, turn the crankshaft 1 revolution (360°).
(c) Turn the crankshaft pulley 60° counterclockwise to place
the sub timing mark (60° mark BTDC) on the crankshaft
pulley at the timing mark º0º position of the No.1 timing
belt cover.
NOTICE:
If the timing belt is disengaged, having the crankshaft
pulley at the wrong angle can cause the piston head and
valve head to come into contact with each other when you
remove the camshaft timing pulleys (steps 11 to 17), thus
resulting damage. So, always set the crankshaft pulley at
the correct angle.
(d) Check that the dot marks (60° mark BTDC) of the cam-
shaft timing pulleys are aligned with the timing marks of
the No.4 timing belt cover.
(e) Remove the crankshaft pulley bolt.
NOTICE:
Do not turn the crankshaft pulley.
11. REMOVE TIMING BELT FROM CAMSHAFT TIMING
PULLEYS
HINT:
(Re±using timing belt):
Place matchmarks on the timing belt and camshaft timing pul-
leys as shown in the illustration.