Fuel Pressure Release: Service and Repair

1NZ-FXE FUEL: FUEL SYSTEM: PRECAUTION

PRECAUTION

1. PRECAUTION
(a) Before working on the fuel system, disconnect the cable from the negative (-) battery terminal.
CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.

(b) Do not work on the fuel system near fire. Never smoke while performing work.
(c) Keep rubber or leather parts away from gasoline.
2. DISCHARGE FUEL SYSTEM PRESSURE
CAUTION:
- Before removing the fuel system parts, take precautions to prevent gasoline spillage.
- As some pressure remains in the fuel line even after taking precautions to prevent gasoline spillage, use a shop rag to prevent gasoline from spilling when disconnecting the fuel line.

(a) Set the vehicle to "INSPECTION MODE1" Component Tests and General Diagnostics.
(b) Disconnect the cable from the negative (-) battery terminal.
CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.

(c) Remove the rear seat cushion Removal.
(d) Remove the rear floor service hole cover.





(e) Disconnect the fuel pump connector.

(f) Connect the cable to the negative (-) battery terminal.
(g) Start the engine.
(h) After the engine stops (rough idle), turn the power switch OFF.
HINT: DTC P0171 (system too lean) may be present.

(i) Crank the engine again, then check that the engine does not start.
(j) Remove the fuel tank cap, then discharge the pressure in the fuel tank completely.
(k) Disconnect the cable from the negative (-) battery terminal.
(l) Connect the fuel pump connector.
(m) Install the rear floor service hole cover.
(n) Install the rear seat cushion Installation.
(o) Connect the cable to the negative (-) battery terminal.
(p) Perform initialization Repair Instruction - Initialization.
NOTE: Certain systems need to be initialized after disconnecting and reconnecting the cable from the negative (-) battery terminal.

3. FUEL SYSTEM
(a) When disconnecting the high-pressure fuel line, a large amount of gasoline will spill out. So take the following precautions.




(1) Discharge the fuel system pressure (see step DISCHARGE FUEL SYSTEM PRESSURE).
(2) Disconnect the fuel pump tube.
(3) Drain the pressure remaining in the fuel pump tube.
(4) Cover the disconnected fuel pump tube (fuel tube joint and fuel tube connector) with a plastic bag to prevent damage and intrusion of foreign objects.
(b) Take the following precautions when removing and installing the fuel injector.




(1) Do not reuse the O-ring.
(2) Do not damage a new O-ring when installing it to the fuel injector.
(3) Before installing a new O-ring, apply spindle oil or gasoline.
NOTE: Do not use engine oil, gear oil or brake fluid.





(c) Install the fuel injector to the fuel delivery pipe and cylinder head as illustrated.
NOTE: Apply spindle oil or gasoline to the contact surface of the fuel delivery pipe and fuel injector before installing the fuel injector.

(d) Take the following precautions when removing the fuel tube connector (Type A).




(1) Check the fuel tube connector and pipe for dirt or mud before removing the fuel tube connector.
If they are dirty, wipe them off with a shop rag.
(2) Pinch the retainer as illustrated, then pull out the fuel tube connector from the pipe.




(3) If the fuel tube connector and pipe are stuck, pinch the pipe, then push and pull the fuel tube connector to release and disconnect the fuel tube connector.
NOTE: Do not use any tools.
(4) After removing the fuel tube, check the sealing surface of the pipe for dirt or mud.
If it is dirty, wipe it off with a shop rag.




(5) Cover the disconnected fuel tube connector and pipe with a plastic bag to prevent damage and intrusion of foreign objects.

(e) Take the following precautions when installing the fuel tube connector (Type A).




(1) Align the fuel tube connector with the pipe, then push in the fuel tube connector until the retainer makes a "click" sound.
HINT: If they are connected too tightly, apply a light coat of engine oil to the tip of the pipe, then install the fuel tube connector.




(2) After connecting the fuel tube connector, check that the fuel tube connector and pipe are securely connected by pulling them.

(f) Take the following precautions when removing the fuel tube connector (Type B).




(1) Check the fuel tube connector and pipe for dirt or mud before removing the fuel tube connector.
If they are dirty, wipe them off with a shop rag.
(2) Pinch the retainer as illustrated, then pull out the fuel tube connector from the pipe.




(3) If the fuel connector and pipe are stuck, pinch the pipe, then push and pull the fuel tube connector to release and disconnect the fuel tube connector.
NOTE: Do not use any tools.
(4) After removing the fuel tube, check the sealing surface of the pipe for dirt or mud.
If it is dirty, wipe it off with a shop rag.




(5) Cover the disconnected fuel tube connector and pipe with a plastic bag to prevent damage and intrusion of foreign objects.

(g) Take the following precautions when installing the fuel tube connector (Type B).




(1) Align the fuel tube connector with the pipe, then push in the fuel tube connector until the retainer makes a "click" sound.
HINT: If they are connected too tightly, apply a light coat of engine oil to the tip of the pipe, then install the fuel tube connector.




(2) After connecting the fuel tube connector, check that the fuel tube connector and pipe are securely connected by pulling them.

4. INSPECT FOR FUEL LEAK
(a) Check that there are no fuel leaks after doing maintenance on the fuel system Testing and Inspection.