LEXUS GS400 2000 Service Repair Manual

SF0O4±01
B01273
Ohmmeter
Continuity
B00798
Ohmmeter
No Continuity
B00799
Air
E
G
B00800
BatteryAir
F
E
± SFI (2JZ±GE)VSV FOR VAPOR PRESSURE SENSOR
SF±57
1523 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. DISCONNECT CHARCOAL CANISTER ASSEMBLY
FROM BODY
Remove the 3 nuts, and disconnect the charcoal canister from
the body.
2. REMOVE VSV
3. INSPECT VSV
(a) Inspect the VSV for open circuit.
Using an ohmmeter, check that there is continuity be-
tween the terminals.
Resistance: 33 ± 39 W at 20°C (68°F)
If there is no continuity, replace the VSV.
(b) Inspect the VSV for ground.
Using an ohmmeter, check that there is no continuity be-
tween each terminal and the body.
If there is continuity, replace the VSV.
(c) Inspect the VSV operation.
(1) Check that air flows from ports E to G.
(2) Apply battery positive voltage across the terminals.
(3) Check that air flows from ports E to F.
If operation is not as specified, replace the VSV.
4. REINSTALL VSV
5. REINSTALL CHARCOAL CANISTER ASSEMBLY

SF0O5±01
B02006
Non±reusable partECT Sensor Connector
ECT Sensor
Gasket
SF±58
± SFI (2JZ±GE)ENGINE COOLANT TEMPERATURE (ECT) SENSOR
1524 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
ENGINE COOLANT TEMPERATURE (ECT) SENSOR
COMPONENTS

SF0O6±01
B01944
SST
Z02917
Ohmmeter
Acceptable
RESISTANCE KW
TEMPERATURE °C (°F)
± SFI (2JZ±GE)ENGINE COOLANT TEMPERATURE (ECT) SENSOR
SF±59
1525 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. DRAIN ENGINE COOLANT
2. REMOVE ECT SENSOR
(a) Disconnect the ECT sensor connector.
(b) Using SST, remove the ECT sensor and gasket.
SST 09205±76030
3. INSPECT ECT SENSOR
Using an ohmmeter, measure the resistance between the ter-
minals.
Resistance: Refer to the graph
If the resistance is not as specified, replace the ECT sensor.
4. REINSTALL ECT SENSOR
(a) Install a new gasket to the ECT sensor.
(b) Using SST, install the ECT sensor.
SST 09205±76030
Torque: 19.6 N´m (200 kgf´cm, 14 ft´lbf)
(c) Connect the ECT sensor connector.
5. REFILL WITH ENGINE COOLANT

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.

SF±8
± SFI (2JZ±GE)FUEL PUMP
1474 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
If operation is not as specified, replace the fuel pump.
(f) Reconnect the fuel pump & sender gauge connector.
(g) Reinstall the floor service hole cover with the cap nuts.
(h) Reinstall the rear seat cushion.

SF0ZQ±02
B07573
Vapor Pressure Sensor Connector
Vapor Pressure Sensor
Vacuum Hose
Charcoal Canister Assembly
SF±60
± SFI (2JZ±GE)VAPOR PRESSURE SENSOR
1526 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
VAPOR PRESSURE SENSOR
COMPONENTS

SF0O8±01
B07574
Voltmeter
Disconnect
E2VC
B07575
Disconnect
Pressure
Vacuum
PTNK
ECM
E2Voltmeter
± SFI (2JZ±GE)VAPOR PRESSURE SENSOR
SF±61
1527 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. INSPECT POWER SOURCE VOLTAGE OF VAPOR
PRESSURE SENSOR
(a) Disconnect the vapor pressure sensor connector.
(b) Turn the ignition switch ON.
(c) Using a voltmeter, measure the voltage between connec-
tor terminals VC and E2 of the wiring harness side.
Voltage: 4.5 ± 5.5 V
(d) Turn the ignition switch OFF.
(e) Reconnect the vapor pressure sensor connector.
2. INSPECT POWER OUTPUT OF VAPOR PRESSURE
SENSOR
(a) Turn the ignition switch ON.
(b) Disconnect the vacuum hose from the vapor pressure
sensor.
(c) Connect a voltmeter to terminals PTNK and E2 of the
ECM, and measure the output voltage under these condi-
tions:
(1) Apply vacuum (2.0 kPa (15 mmHg, 0.59 in.Hg)) to
the vapor pressure sensor.
Voltage: 1.3 ± 2.1 V
(2) Release the vacuum from the vapor pressure sen-
sor.
Voltage: 3.0 ± 3.6 V
(3) Apply pressure (1.5 kPa (15 gf/cm
2, 0.22 psi)) to the
vapor pressure sensor.
Voltage: 4.2 ± 4.8 V
(d) Turn the ignition switch OFF.
(e) Reconnect the vacuum hose to the vapor pressure sen-
sor.

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.