Fuel System

1. CHECK FUEL PUMP OPERATION.
(a) Connect a LEXUS hand-held tester to the DLC3.
(b) Turn the ignition switch ON, and push the 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 positive (+) and negative (-) leads from the battery to the fuel pump connector.


(f) Check that there is pressure in the fuel inlet hose.

HINT: If there is fuel pressure, you will hear the sound of fuel flowing.

- If there is no pressure, check these parts:
- Fusible link
- Fuses
- EFI main relay
- Fuel pump
- Fuel pump relay
- Fuel pump resistor
- ECM
- 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 battery.
(c) Remove the fuel pressure pulsation damper.





(d) Install the fuel inlet hose and SST (pressure gauge) to the delivery pipe with the 3 gaskets and the SST (union bolt).
SST 09268-45012

Torque: 39 N.m (400 kgf.cm. 29 ft.lb.)

(e) Wipe off any splattered gasoline.





(f) Connect the LEXUS hand-held tester to the DLC3.

(See step 1 ((a) to (e)) above)

(g) Reconnect the negative (-) terminal cable to the battery.
(h) Turn the ignition switch ON.
(i) Measure the fuel pressure.

Fuel pressure: 265 - 304 kPa
(2.7 - 3.1 kgf/cm2. 38 - 44 psi)

- If pressure is high, replace the fuel pressure regulator.
- If pressure is low, check these parts:
- Fuel hoses and connections
- Fuel pump
- Fuel filter
- Fuel pressure regulator
(j) Remove the LEXUS hand-held tester from the DLC3.





(K) Start the engine.
(l) Disconnect the vacuum sensing hose from the fuel pressure regulator, and plug the hose end.
(m) Measure the fuel pressure at idle.

Fuel pressure: 265 - 304 kPa
(2.7 - 3.1 kgf/cm2, 38 - 44 psi)

(n) Reconnect the vacuum sensing hose to the fuel pressure regulator.
(o) Measure the fuel pressure at idle.

Fuel pressure: 196 - 235 kPa
(2.0 - 2.4 kgf/cm2, 28 - 34 psi)

- If pressure is not as specified. check the vacuum sensing hose and fuel pressure regulator.
(p) Stop the engine.
(q) Check that the fuel pressure remains as specified for 5 minutes after the engine has stopped.

Fuel pressure: 147 kPa (1.5 kgf/cm2, 21 psi) or more

- If pressure is not as specified, check the fuel pump. pressure regulator and/or injectors.
(r) After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the SST to prevent gasoline from splashing. SST 09268-45012
(s) Reinstall the fuel pressure pulsation damper.


(t) Reconnect the negative (-) terminal cable to the battery.
(u) Check for fuel leaks.