Fuel System

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 push the LEXUS hand-held tester main switch ON.

NOTICE: Do not start the engine.

(c) Select the active test mode or 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 (+) lead from the battery to terminal 1 of the connector, and the negative (-) lead to terminal 2.

NOTICE:
- These test must be done quickly (within 10 seconds) to prevent the coil from burning out.
- Keep the fuel pump as far away from the battery as possible.
- Always do the switching at the battery side.





(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. INSPECT FUEL PUMP RESISTANCE
Using an ohmmeter, measure the resistance between the terminals.

Resistance: 0.2 - 3.0 Ohms at 20°C (68°F)

If the resistance is not as specified, replace the fuel pump and/or set plate.

3. 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 RH fuel pressure pulsation damper.





(d) Install the fuel inlet hose and SST (pressure gauge) to the delivery pipe with 3 lower gaskets and the SST (union bolt). SST 09268-45014 (09268-41190, 90405-06167)

Torque: 39 N.m (400 kgf-cm, 29 ft.lbf)

(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: 304 - 343 kPa (3.1 - 3.5 kgf/sq. cm, 44 - 50 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) Measure the fuel pressure at idle.

Fuel pressure: 304 - 343 kPa (3.1 - 3.5 kgf/sq.cm, 44 - 50 psi)

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

Fuel pressure: 147 kPa (1.5 kgf/sq.cm, 21 psi) or more

If pressure is not as specified, check the fuel pump, pressure regulator and/or injectors.
(o) 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
(p) Reinstall the fuel pressure pulsation damper.
(q) Reconnect the negative (-) terminal cable to the battery.
(r) Check for fuel leaks.