Fuel (inspection) Lexus IS F I

PRECAUTION

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1. DISCHARGE FUEL SYSTEM PRESSURE WARNING: Do not disconnect any parts of the fuel system until you have discharged the fuel system pressure. Even after discharging the fuel pressure, place a piece of cloth or equivalent over fittings as you separate them to reduce the risk of fuel spraying on yourself or in the engine compartment. Allow the engine to cool down before performing the following procedures, as the high pressure side fuel pressure does not decrease until the engine cools down. NOTE: Perform these procedures with the engine coolant temperature at 60°C (140°F) or less. When removing the F/PMP relay. Remove the No. 2 relay block cover UPR. Remove the F/PMP relay. Disconnect the fuel pump resistor connector. Refer to «REMOVAL - Step 3»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information) . Start the engine. After the engine has stopped, turn the engine switch off. HINT: DTC P0171/25 (fuel problem) and/or P0191/49 (fuel pressure sensor signal error) may be detected. Crank the engine again. Check that the engine does not start. Remove the fuel tank cap to discharge pressure from the fuel tank. Disconnect the cable from the negative (-) battery terminal. Reinstall the F/PMP relay. Connect the fuel pump resistor connector. When disconnecting the fuel pump connector. Remove the rear seat cushion assembly. Remove the rear floor service hole cover. Disconnect the fuel pump connector. Start the engine. After the engine has stopped, turn the engine switch off. HINT: DTC P0171/25 (fuel problem) and/or P0191/49 (fuel pressure sensor signal error) may be detected. Crank the engine again. Check that the engine does not start. Remove the fuel tank cap to discharge pressure from the fuel tank. Disconnect the cable from the negative (-) battery terminal. Reconnect the fuel pump connector. Install the rear floor service hole cover. Install the rear seat cushion assembly.
2. FUEL LINE When disconnecting a fuel line, fuel will spray out. Observe the following procedure: Put a container under the connections. Disconnect the fuel tube. Drain the fuel remaining inside the fuel tube into the container. Cover the disconnected fuel tube (fuel tube joint and fuel tube connector) with a plastic bag to prevent damage and intrusion of foreign matter. Observe the following procedure when disconnecting a fuel tube connector (quick type A). For fuel pipe clamp type A: Remove the No. 1 fuel pipe clamp. For fuel hose connector cover type A: Remove the fuel hose connector cover. For fuel hose connector cover type B: Disengage the lock claw by raising the fuel hose connector cover as shown in the illustration. Check for foreign matter on the pipe and around the connector before disconnecting it. Clean it if necessary. If the connector and pipe are stuck, pinch the connector, and push and pull on the pipe to disconnect them. NOTE: Do not use any tools in this step. Check for foreign matter on the seal surface on the disconnected pipe. Clean it if necessary. To protect the disconnected pipe and connector from damage and foreign matter, cover them with a plastic bag. Observe the following procedure when connecting a fuel tube connector (quick type A): Check that there is no damage or foreign matter on the pipe connections. Align the axis of the connector with the axis of the pipe. Push the pipe into the connector until the connector makes a "click" sound. If the pipe is difficult to push into the connector, apply a small amount of clean engine oil to the tip of the pipe and reinsert it. After connecting, check that the pipe and connector are securely connected by pulling on them. For fuel hose connector cover type A: Install the fuel hose connector cover. For fuel hose connector cover type B: Engage the lock claws to the connector by pushing down on the fuel hose connector cover. For fuel pipe clamp type A: Install the No. 1 fuel pipe clamp. Observe the following procedure when disconnecting a fuel tube connector (quick type B). Before disconnecting a connector, clean off any dirt that may be present. Pinch the tabs of the fuel tube retainer to disengage the 2 claws. Push the retainer down as shown in the illustration. NOTE: Be sure to disconnect the connector by hand. If the connector and pipe are stuck, hold the fuel pipe by hand and push and pull on the connector. Pull the two pipes apart to separate the connector. If there are any dirt or any other foreign matter on the sealing surfaces of the disconnected pipes, clean them if necessary. Do not damage the disconnected pipe and connector, and prevent entry of foreign matter by covering them with plastic bags. Observe the following procedure when connecting a fuel tube connector (quick type B): Line up the two parts of the pipes to be connected, and fully push the fuel tube connector and pipe together until they are fully seated. Push the retainer into the connector until its claws lock. If the pipe is difficult to push into the connector, apply a small amount of clean engine oil to the tip of the pipe and reinsert it. After connecting, check that the pipe and connector are securely connected by pulling on them. Check for fuel leaks. Observe the following precautions when handling a nylon tube: WARNING: Do not twist the connection part of the nylon tube or the quick connector when connecting them. Do not bend or twist the nylon tube. Do not remove the EPDM protector on the outside of the nylon tube. Do not pinch or kink the nylon tubes to prevent fuel leaks.
3. INJECTOR Observe the following precautions when removing and installing fuel injectors: Do not reuse a O-ring. When placing a new O-ring onto the injector, do not damage the O-ring. Coat a new O-ring with gasoline before installing it. Do not use engine oil, gear oil or brake fluid. Install the injector into the delivery pipe and cylinder head as shown in the illustration. Apply gasoline to the contact surfaces of the delivery pipe and the injector before installing the injector.
4. FUEL SUCTION TUBE ASSEMBLY WITH PUMP AND GAUGE Do not disconnect the tube shown in the illustration when disassembling the fuel suction tube assembly with pump and gauge. Doing so will cause reassembly of the fuel suction tube assembly with pump and gauge to be impossible as the tube is welded to the plate.
5. INSPECT FOR FUEL LEAK Check that there is no fuel leakage after performing maintenance anywhere on the fuel system See step 1 .

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1. FUEL FLOW DIAGRAM
2. ELECTRICAL CONTROL DIAGRAM
3. HIGH PRESSURE SIDE (DIRECT INJECTION SIDE) FUEL SYSTEM WIRING DIAGRAM
4. FUEL PRESSURE SENSOR AND PORT INJECTION SIDE FUEL SYSTEM WIRING DIAGRAM
5. LOW PRESSURE SIDE FUEL SYSTEM WIRING DIAGRAM
6. INJECTOR DRIVER WIRING DIAGRAM

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1. CHECK FOR FUEL PUMP OPERATION AND INSPECT FOR FUEL LEAK Check fuel pump operation. Connect the Techstream to the DLC3. Turn the engine switch on (IG). NOTE: Do not start the engine. Turn the Techstream on. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed. Check for pressure in the fuel inlet tube from the fuel line. Check that sounds of fuel flowing in the fuel tank can be heard. If no sounds can be heard, check the instrument panel junction block, fuel pump, ECM and wiring connectors. Inspect for fuel leaks. Check that there are no fuel leaks from the fuel system after performing any maintenance. If there is a fuel leak, repair or replace parts as necessary. Turn the engine switch off. Disconnect the Techstream from the DLC3.
2. CHECK FUEL PRESSURE Using a voltmeter, measure the battery voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition Positive terminal - Negative terminal Engine switch off 11 to 14 V Discharge the fuel system pressure. Refer to «PRECAUTION»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-inspection__precaution) . Disconnect the cable from the negative (-) battery terminal. When checking the fuel pressure of the direct injection side: Disconnect the fuel pump main tube. Remove the fuel hose connector cover. Pinch the connector and pull the fuel tube. Refer to «PRECAUTION»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-inspection__precaution) . WARNING: Always read Precaution. Refer to «PRECAUTION»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-inspection__precaution) before disconnecting the fuel tube connector (for quick type A). The fuel tube may spray fuel as a result of pressure that remains in the tube. Do not allow fuel to be sprayed into the engine compartment. When checking the fuel pressure of the port injection side: Disconnect the fuel pump main tube. Remove the fuel pipe clamp. Pinch the connector and pull the fuel tube. WARNING: Always read Precaution. Refer to «PRECAUTION»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-inspection__precaution) before disconnecting the fuel tube connector (quick type A). The fuel tube may spray fuel as a result of pressure that remains in the tube. Do not allow fuel to be sprayed into the engine compartment. Install SST (pressure gauge) as shown in the illustration. SST: 09268-31012 09268-41500 90467-13001 95336-08070 SST: 09268-45014 09268-41200 09268-41220 09268-41250 Wipe off any gasoline. Reconnect the cable to the negative (-) battery terminal. Operate the fuel pump. Connect the Techstream to the DLC3. Turn the engine switch on (IG). NOTE: Do not start the engine. Turn the Techstream on. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed. Measure the fuel pressure. Standard fuel pressure 196 to 588 kPa (2 to 6 kgf/cm 2 , 28 to 85 psi) If the fuel pressure is higher than the specification, replace the fuel pump (built into the fuel tank). If the pressure is lower than the specification, check the fuel hoses, connections and fuel pump (built into the fuel tank). Connect the Techstream to the DLC3. Start the engine. Measure the fuel pressure at idle. Standard fuel pressure 196 to 588 kPa (2 to 6 kgf/cm 2 , 28 to 85 psi) If the pressure is not as specified, check the fuel pump and injectors. Stop the engine. Check that the fuel pressure remains as specified for 5 minutes after the engine has stopped. Standard fuel pressure 147 kPa (1.5 kgf/cm 2 , 21 psi) or more If the pressure is not as specified, check the fuel pump or injectors. After checking the fuel pressure, disconnect the cable from the negative (-) battery terminal and carefully remove SST and the fuel tube connector to prevent fuel from spilling. Reconnect the fuel pump main tube. Refer to «PRECAUTION»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-inspection__precaution) . Inspect for fuel leaks.
3. CHECK FUEL PRESSURE (for High Pressure) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Start and warm up the engine. Run the engine at idle. Enter the following menus: Powertrain / Engine / Data List / Fuel Press. Check the high pressure side fuel pressure. Standard fuel pressure 3.5 to 4.5 MPa (35.7 to 45.9 kgf/cm 2 , 508 to 653 psi) If the pressure is not as specified, check the fuel pump, high pressure side fuel pump, fuel pressure sensor and wirings. Stop the engine.
4. PERFORM INITIALIZATION NOTE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected. Refer to «INITIALIZATION»(/lexus/is-f/i-2007-2014/remont/hoistjack/#introduction__initialization) .

See also:
• REMOVAL - Step 3
• INITIALIZATION
• PRECAUTION