Fuel Delivery and Air Induction: Service Precautions
FUEL SYSTEM (3MZ-FE)PRECAUTION
1. PRECAUTION
(a) Before working on the fuel system, disconnect the engine wire No.3 (battery negative terminal) from battery.
(b) Do not smoke or work near open flame when working on the fuel system.
(c) Keep gasoline away from the rubber or leather parts.
2. DISCHARGE FUEL SYSTEM PRESSURE
CAUTION:
- Do not disconnect any parts of the fuel system pressure until you have discharging the fuel system pressure.
- Even after discharge the fuel pressure, place a shop rag over fittings as you separate them in order to reduce risk of fuel spray on yourself or in the engine compartment.
(a) Disconnect the engine wire No.3 (battery negative terminal).
(b) Remove the circuit opening relay from the engine room relay block.
(c) Connect the engine wire No.3 (battery negative terminal).
Torque: 5.4 N-m (55 kgf-cm, 48 in.-lbf)
(d) Start the engine. After the engine has stopped on its own, turn the ignition switch OFF.
HINT: There is a case that DTC P0171 (system too lean) is output.
(e) Check that the engine does not start.
(f) Remove the fuel tank cap, then let the air out of the fuel tank.
(g) Disconnect battery negative terminal.
(h) Reinstall the circuit opening relay.
3. FUEL SYSTEM
(a) When disconnecting the high fuel pressure line, a large amount of gasoline will spill out. So observe these procedures.
(1) Work in order to prevent gasoline from spilling out.
(2) Disconnect the fuel pump tube.
(3) Drain the fuel remaining inside the fuel pump tube.
(4) In order to prevent the disconnected fuel pump tube from being damaged and foreign objects from being introduced, cover the disconnected fuel pump tube with a vinyl or plastic bag.
(5) Place a tray under the vehicle or point of disconnection to catch any fuel that may spill.
(6) Put a container under the connection.
(b) Take the following precautions when removing and installing the fuel injectors.
NOTICE: Never reuse the O-ring.
(1) When installing a new O-ring on the fuel injector, be careful not to damage it.
(2) Coat a new 0-ring with spindle oil or gasoline before installing. Never use engine oil, gear oil or brake oil.
(c) Install the fuel injector to the fuel delivery pipe and intake manifold as shown in the illustration. Before installing the fuel injector, be sure to apply spindle oil or gasoline to the place where the fuel delivery pipe or intake manifold touches the 0-ring of the fuel injector.
(d) Take the following precautions when disconnecting the quick connector.
(1) Remove the fuel pipe clamp.
(2) Check the pipe and around the quick connector for dirt or mud before disconnecting them. Remove the dirt if necessary.
(3) Disconnect the quick connector from the pipe while pinching portion A with your fingers as shown in the illustration.
(4) If the quick connector and pipe are stuck, pinch the pipe, then push and pull the quick connector to release and pull it out.
NOTICE: Do not use any tools.
(5) If there is dirt or any other substances on the sealing surface that might interfere with the seal, clean the area thoroughly before assembling.
(6) In order to prevent the disconnected pipe and quick connector from damage or dirt, cover them with a vinyl or plastic bag.
(e) Take the following precautions when connecting the quick connector.
(1) Check the connected part of the pipe for damage or foreign objects.
(2) Align the axis of the quick connector with the axis of the pipe, then push into the quick connector until the quick connector makes a "click' sound. In case that the connection is tight, apply a little amount of fresh engine oil to the tip of the pipe.
(3) After connecting, check if the pipe and quick connector are securely connected by pulling on them.
(4) Install the fuel pipe clamp.
(5) Check if there is any leakage.
4. CHECK FOR FUEL LEAKS
(a) Check that there are no fuel leaks after doing maintenance anywhere on the fuel system.