2000 LEXUS GS400 check engine

B01982
LEXUS
Hand±Held
Tester
B01879
Ohmmeter54
B01880
5
4 Battery
± SFI (2JZ±GE)FUEL PUMP
SF±7
1473 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(f) Connect a LEXUS hand±held tester to the DLC3.
(See step 1 in check fuel pump operation (a) to (e))
(g) Measure the fuel pressure.
Fuel pressure:
304 ± 343 kPa (3.1 ± 3.5 kgf/cm
2, 44 ± 50 psi)
If pressure is high, replace the fuel pressure regulator.
If pressure is low, check the fuel hoses and connections, fuel
pump, fuel filter and fuel pressure regulator.
(h) Disconnect the LEXUS hand±held tester from the DLC3.
(i) Start the engine.
(j) Measure the fuel pressure at idle.
Fuel pressure:
304 ± 343 kPa (3.1 ± 3.5 kgf/cm
2, 44 ± 50 psi)
(k) Stop the engine.
(l) Check that the fuel pressure remains as specified for 5
minutes after the engine has stopped.
Fuel pressure: 147 kPa (1.5 kgf/cm
2, 21 psi) or more
If pressure is not as specified, check the fuel pump, pressure
regulator and/or injectors.
(m) After checking fuel pressure, disconnect the negative (±)
terminal cable from the battery and carefully remove SST
to prevent gasoline from splashing.
SST 09268±45014
(n) Reconnect the fuel inlet hose to the fuel pipe support with
2 new gaskets and the union bolt.
Torque: 29 N´m (300 kgf´cm, 21 ft´lbf)
(o) Reconnect the negative (±) terminal cable to the battery.
(p) Check for fuel leaks.
3. INSPECT FUEL PUMP
(a) Remove the rear seat cushion.
(b) Remove the 3 cap nuts and floor service hole cover.
(c) Disconnect the fuel pump & sender gauge connector.
(d) Using an ohmmeter, measure the resistance between ter-
minals 4 and 5.
Resistance: 0.2 ± 3.0 W at 20°C (68°F)
If the resistance is not as specified, replace the fuel pump.
(e) Inspect the fuel pump operation.
Connect the positive (+) lead from the battery to terminal
4 of the connector, and the negative (±) lead to terminal
5. Check that the fuel pump operates.
NOTICE:

These tests must be done quickly (within 10 seconds)
to prevent the coil burning out.

Keep the fuel pump as far away from the battery as
possible.

Always do the switching at the battery side.

SF0OA±04
B09503
SST
P01630
OhmmeterNo Continuity
± SFI (2JZ±GE)KNOCK SENSOR
SF±63
1529 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. REMOVE ENGINE COVER
Remove the 4 nuts and engine cover.
2. REMOVE PS PUMP REAR STAY
3. REMOVE KNOCK SENSOR 1
(a) Disconnect the knock sensor connector.
(b) Using SST, remove the knock sensor.
SST 09816±30010
4. REMOVE OIL DIPSTICK AND GUIDE FOR A/T
(See page EM±62)
5. REMOVE STARTER (See page ST±4)
6. REMOVE KNOCK SENSOR 2 (See step 2)
7. INSPECT KNOCK SENSORS
Using an ohmmeter, check that there is no continuity between
the terminal and body.
If there is continuity, replace the sensor.
8. REINSTALL KNOCK SENSORS
(a) Using SST, install the knock sensor.
SST 09816±30010
Torque: 44 N´m (450 kgf´cm, 33 ft´lbf)
(b) Connect the knock sensor connector.
9. REINSTALL STARTER (See page ST±16)
10. REINSTALL OIL DIPSTICK AND GUIDE FOR A/T
HINT:
Use a new O±ring.
11. REINSTALL PS PUMP REAR STAY
Torque: 39.2 N´m (400 kgf´cm, 29 ft´lbf)
12. REINSTALL ENGINE COVER
Reinstall the engine cover with the 4 nuts.

SF0OH±03
B01982
LEXUS
Hand±Held
Tester
B01568
Sound Scope
SF±72
± SFI (2JZ±GE)FUEL CUT RPM
1538 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
FUEL CUT RPM
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. INSPECT FUEL CUT±OFF OPERATION
(a) Increase the engine speed to at least 3,000 rpm.
(b) Check for injector operating noise.
(c) Check that when the throttle lever is released, injector op-
eration noise stops momentarily and then resumes.
HINT:
Measure with the A/C OFF.
Fuel return rpm: 1,000 rpm
4. DISCONNECT LEXUS HAND±HELD TESTER OR
OBDII SCAN TOOL

SR0DG±01
R07281
Normal Abnormal
± STEERINGPOWER STEERING FLUID
SR±3
2173 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
POWER STEERING FLUID
BLEEDING
1. CHECK FLUID LEVEL
(See page SR±4)
2. JACK UP FRONT OF VEHICLE AND SUPPORT IT
WITH STANDS
3. TURN STEERING WHEEL
With the engine stopped, turn the wheel slowly from lock to lock
several times.
4. LOWER VEHICLE
5. START ENGINE
Run the engine at idle for a few minutes.
6. TURN STEERING WHEEL
(a) With the engine at idling, turn the wheel to left or right full
lock position and keep it there for 2±3 seconds, then turn
the wheel to the opposite full lock position and keep it
there for 2±3 seconds.
(b) Repeat (a) several times.
7. STOP ENGINE
8. CHECK FOR FOAMING OR EMULSIFICATION
If the system has to be bled twice specifically because of foam-
ing or emulsification, check for fluid leaks in the system.
9. CHECK FLUID LEVEL
(See page SR±4)

SR0DH±01
F03835
R07281
Normal Abnormal
R11361
5 mm (0.2 in.) or less
Engine Idling Engine Stopped SR±4
± STEERINGPOWER STEERING FLUID
2174 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. CHECK FLUID LEVEL
(a) Keep the vehicle level.
(b) With the engine stopped, check the fluid level in the oil
reservoir.
If necessary, add fluid.
Fluid: ATF DEXRON® II or III
HINT:
Check that the fluid level is within the HOT LEVEL range on the
reservoir cap dipstick.
If the fluid is cold, check that it is within the COLD LEVEL range.
(c) Start the engine and run it at idle.
(d) Turn the steering wheel from lock to lock several times to
boost fluid temperature.
Fluid temperature: 80°C (176°F)
(e) Check for foaming or emulsification.
If there is foaming or emulsification, bleed power steering sys-
tem. (See page SR±3)
(f) With the engine idling, measure the fluid level in the oil
reservoir.
(g) Stop the engine.
(h) Wait a few minutes and remeasure the fluid level in the oil
reservoir.
Maximum fluid level rise: 5 mm (0.20 in.)
If a problem is found, bleed power steering system.
(See page SR±3)
(i) Check the fluid level.

F03674
SST
IN
OUT
Pressure Feed Tube Attachment 2JZ±GE: 1UZ±FE:
Attachment
OUT IN Pressure Feed Tube
± STEERINGPOWER STEERING FLUID
SR±5
2175 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
2. CHECK STEERING FLUID PRESSURE
(a) 1UZ±FE:
Remove the air cleaner inlet.
(b) 1UZ±FE:
Remove the air cleaner assembly with air cleaner hose.
(See page SR±31)
(c) Disconnect the pressure feed tube from the PS vane
pump.
(2JZ±GE Engine: See page SR±21)
(1UZ±FE Engine: See page SR±31)
SST 09631±22020
(d) Connect SST, as shown below.
SST 09640±10010 (09641±01010, 09641±01030,
09641±01060)
NOTICE:
Check that the valve of the SST is in the open position.
(e) Bleed the power steering system.
(See page SR±3)
(f) Start the engine and run it at idle.
(g) Turn the steering wheel from lock to lock several times to
boost fluid temperature.
Fluid temperature: 80 °C (176 °F)

SR0E7±01
F02565
± STEERINGPOWER STEERING GEAR
SR±57
2227 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
1. INSTALL GROMMET AND BRACKET
2. INSTALL PS GEAR ASSEMBLY
(a) Torque the 4 gear assembly set bolts.
Torque: 65 N´m (660 kgf´cm, 48 ft´lbf)
(b) Connect the connector.
3. 2JZ±GE Engine:
CONNECT TUBE CLAMP
Torque the bolt.
Torque: 5 N´m (55 kgf´cm, 48 in.´lbf)
4. 1UZ±FE Engine:
CONNECT 2 TUBE CLAMPS
Torque the bolt.
Torque: 5 N´m (55 kgf´cm, 48 in.´lbf)
5. CONNECT INTERMEDIATE SHAFT ASSEMBLY
(See page SR±17)
6. CONNECT PRESSURE FEED AND RETURN TUBES
(a) Pressure feed tube:
Torque the union bolt over a new gaskets.
Torque: 42 N´m (430 kgf´cm, 31 ft´lbf)
(b) Return tube:
Torque the union bolt with a new gasket on each side of
the tube.
Torque: 42 N´m (430 kgf´cm, 31 ft´lbf)
7. CONNECT RH AND LH TIE ROD ENDS
(See page SA±9)
8. POSITION FRONT WHEELS FACING STRAIGHT
AHEAD
HINT:
Do it with the front of the vehicle jacked up.
9. CENTER SPIRAL CABLE
(See page SR±17)
10. INSTALL STEERING WHEEL
(a) Align the matchmarks on the wheel and steering column
main shaft.
(b) Temporarily tighten the wheel set nut.
(c) Connect the connector.
11. BLEED POWER STEERING SYSTEM
(See page SR±3)
12. CHECK STEERING WHEEL CENTER POINT
13. TORQUE STEERING WHEEL SET NUT
Torque: 35 N´m (360 kgf´cm, 26 ft´lbf)
14. INSTALL STEERING WHEEL PAD
(See page SR±17)
15. CHECK FRONT WHEEL ALIGNMENT
(See page SA±4)

F04512
2JZ±GE:
1UZ±FE:
Vacuum Hose
Vacuum Hose
SR0DI±01
± STEERINGAIR CONTROL VALVE
SR±7
2177 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
AIR CONTROL VALVE
INSPECTION
1. TURN AIR CONDITIONING SWITCH OFF
2. CHECK IDLE±UP
(a) Start the engine and run it at idle.
(b) Fully turn the steering wheel.
(c) Check that the engine rpm decreases when the vacuum
hose of the air control valve is pinched.
(d) Check that the engine rpm increases when the hose is re-
leased.