2000 LEXUS GS400 engine

B01982
LEXUS
Hand±Held
TesterSF0N2±05
B09511
Up
Screw
Pulsation Damper
B01958
Fuel Inlet Hose
A02818
SST
SST
(Union)
SST
(Adapter)
SF±6
± SFI (2JZ±GE)FUEL PUMP
1472 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
FUEL PUMP
ON±VEHICLE INSPECTION
1. CHECK FUEL PUMP OPERATION
(a) Connect a LEXUS hand±held tester to the DLC3.
(b) Turn the ignition switch ON and LEXUS hand±held tester
main switch ON.
NOTICE:
Do not start the engine.
(c) Select the ACTIVE TEST mode on the LEXUS hand±held
tester.
(d) Please refer to the LEXUS hand±held tester operator's
manual for further details.
(e) If you have no LEXUS hand±held tester, connect the pos-
itive (+) and negative (±) leads from the battery to the fuel
pump connector. (See step 3)
(f) Check that the pulsation damper screw rises up when the
fuel pump operates.
If there is no pressure, check the fusible link, fuses, EFI main
relay, fuel pump ECU, fuel pump, ECM and wiring connections.
(g) Turn the ignition switch OFF.
(h) Disconnect the LEXUS hand±held tester from the DLC3.
2. CHECK FUEL PRESSURE
(a) Check the battery positive voltage is above 12 V.
(b) Disconnect the negative (±) terminal cable from the bat-
tery.
(c) Remove the union bolt and 2 gaskets, and disconnect the
fuel inlet hose from the fuel pipe support.
NOTICE:

Put a shop towel under the fuel pipe support.

Slowly loosen the union bolt.
(d) Install the fuel inlet hose and SST (pressure gauge) to the
fuel pipe support with the 3 gaskets and SST (union and
adapter).
SST 09268±45014 (09268±41190, 90405±06167)
Torque: 29 N´m (300 kgf´cm, 21 ft´lbf)
(e) Wipe off any splattered gasoline.

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.

SF0O9±04
B08975
N´m (kgf´cm, ft´lbf) : Specified torque

Non±reusable part
Knock Sensor 1
44 (450, 33)
Knock Sensor Connector
44 (450, 33)
Knock Sensor 2
Knock Sensor Connector
Engine Wire Clamp

O±Ring
Oil Dipstick and Guide for A/TPS Pump Rear Stay
Starter
Starter ConnectorClamp Bracket
Starter Wire
Engine Cover
SF±62
± SFI (2JZ±GE)KNOCK SENSOR
1528 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
KNOCK SENSOR
COMPONENTS

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.

B08327
Bank 2 Sensor 1
N´m (kgf´cm, ft´lbf) : Specified torquePCV Hose
PS Air Hose
Air Cleaner Inlet
Wire Grommet EVAP Hose
Heated Oxygen Sensor
(Bank 2 Sensor 1)

Gasket Air Cleaner,
MAF Meter and
Intake Air Resonator
Assembly
MAF Meter Connector
Front Exhaust
Pipe

Gasket Engine Wire Clamp
Heated Oxygen Sensor
Connector
Case Clamp

Clamp
Pipe Support Bracket
Heated Oxygen Sensor Connector

Non±reusable part
44 (440, 32)
40 (408, 30)
44 (440, 32)
Exhaust Manifold
x 8
Engine Cover
± SFI (2JZ±GE)HEATED OXYGEN SENSOR
SF±65
1531 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

SF0OF±01
B01872
ECM Hood
ECM Cover
ECM Connector
ECM
SF±70
± SFI (2JZ±GE)ENGINE CONTROL MODULE (ECM)
1536 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
ENGINE CONTROL MODULE (ECM)
COMPONENTS

SF0OG±01
± SFI (2JZ±GE)ENGINE CONTROL MODULE (ECM)
SF±71
1537 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. REMOVE ECM
2. INSPECT ECM (See page DI±20)
3. REINSTALL ECM

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