Fuel System

ON-VEHICLE INSPECTION




1. CHECK FUEL PUMP OPERATION
a. Connect the LEXUS hand-held tester or OBDII scan tool to the DLC3.
b. Turn the ignition switch ON and LEXUS hand-held tester or OBDII scan tool main switch ON.

NOTE: Do not start the engine.

c. Select the active test mode on the LEXUS hand-held tester or OBDII scan tool.
d. Please refer to the LEXUS hand-held tester or OBDII scan tool operator's manual for further details.
e. If you have no LEXUS hand-held tester or OBDII scan tool, connect the positive (+) and negative (-) leads from the battery to the fuel pump connector.




f. Check that there is pressure in the fuel inlet pipe from the fuel filter.

HINT: If there is fuel pressure, you will hear the sound of fuel flowing. If there is no pressure, check the fusible link, fuses (AM2 30A, IGN 5A), EFI main relay, fuel pump and wiring connections.

g. Turn the ignition switch to LOCK.
h. Disconnect the LEXUS hand-held tester or OBDII scan tool 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. Purchase the new No. 1 fuel pipe and take out the fuel tube connector from its pipe.

Part No.23801-20120




d. Remove the fuel hose clamp.




e. Disconnect the No. 1 fuel pipe (fuel tube connector) from the fuel tube.

CAUTION:
- Perform disconnecting operations of the fuel tube connector (quick type) after observing the precautions.
- As there is retained pressure in the fuel pipe line, prevent it from splashing inside the engine compartment.




f. Install SST (pressure gauge) as shown in the illustration by using SST and fuel tube connector.

SST 09268-41047,09268-41250,09268-45014

g. Wipe off any splattered gasoline.
h. Reconnect the negative (-) terminal cable to the battery.
i. Connect the LEXUS hand-held tester or OBDII scan tool to the DLC3.
j. Measure the fuel pressure.

Fuel pressure: 301 - 347 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 the fuel hoses and connections, fuel pump, fuel filter and fuel pressure regulator.

k. Disconnect the LEXUS hand-held tester or OBDII scan tool from the DLC3.
l. Start the engine.
m. Measure the fuel pressure at idle.

Fuel pressure: 301 - 347 kPa (3.1 - 3.5 kgf/sq.cm, 44 - 50 psi)

n. Stop the engine.
o. 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.

p. After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the SST and fuel tube connector to prevent gasoline from splashing.

SST 09268-41047,09268-41250, 09268-45014




q. Reconnect the No. 1 fuel pipe (fuel tube connector).

CAUTION: Perform connecting operations of the fuel tube connector (quick type) after observing the precautions.




r. Install the fuel hose clamp to the fuel tube.
s. Reconnect the negative (-) terminal cable to the battery.
t. Check for fuel leakage.




3. INSPECT FUEL PUMP
a. Remove the LH rear seat.
b. Remove the rear seat side garnish.
c. Tarn over the floor carpet.
d. Remove the floor service hole cover.
e. Disconnect the fuel pump & sender gauge connector.
f. Using an Ohmmeter, measure the resistance between terminals 4 and 5.

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

If the resistance is not as specified, replace the fuel pump.




g. 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.

NOTE:
- 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.

If operation is not as specified, replace the fuel pump or lead wire.

h. Reconnect the fuel pump & sender gauge connector.
i. Reinstall the floor service hole cover.
j. Install the floor carpet.
k. Reinstall the rear seat side garnish.
l. Reinstall the LH rear seat.