Lexus GS300/400 (2000 year). Service manual — part 217

B01982

LEXUS
Hand–Held
Tester

B01879

Ohmmeter

5

4

B01880

5

4

Battery

–

SFI (2JZ–GE)

FUEL PUMP

SF–7

1473

(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

Ω

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

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

VAPOR PRESSURE SENSOR

COMPONENTS

SF0O8–01

B07574

Voltmeter

Disconnect

E2

VC

B07575

Disconnect

Pressure

Vacuum

PTNK

ECM

E2

Voltmeter

–

SFI (2JZ–GE)

VAPOR PRESSURE SENSOR

SF–61

1527

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.