PRECAUTION CAUTION:
BEFORE WORKING ON FUEL SYSTEM (a) Before inspecting and repairing the fuel system, disconnect the cable from the negative (-) battery terminal. NOTICE: After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Click here
(b) Do not smoke or work near fire when handling the fuel system. (c) Keep fuel away from rubber or leather parts. DISCHARGE FUEL SYSTEM PRESSURE CAUTION:
(a) When discharging fuel system pressure by disconnecting the EFI-MAIN NO. 2 relay: (1) Remove the No. 1 engine room relay block and No. 1 junction block assembly cover. (2) Remove the EFI-MAIN NO. 2 relay. (3) Remove the V-bank cover sub-assembly. Click here (4) Disconnect the No. 6 engine wire connector and No. 7 engine wire connector.  (5) Start the engine. After the engine has stopped on its own, turn the engine switch off. NOTICE: Do not increase the engine speed or drive the vehicle while waiting for the engine to stop on its own. (6) Crank the engine again and make sure that the engine does not start. HINT: DTC P008700 (Fuel Rail / System Pressure - Too Low), P017100/P017400 (System Too Lean), P160300 (Engine Stall History), P160400 (Startability Malfunction) or P160500 (Rough Idling) may be stored. Clear the DTCs before proceeding to the next step. Click here
(7) Remove the fuel tank cap assembly and discharge the pressure from the fuel tank assembly. (8) Disconnect the cable from the negative (-) battery terminal. NOTICE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected. Click here (9) Connect the No. 6 engine wire connector and No. 7 engine wire connector. (10) Install the V-bank cover sub-assembly. Click here
(11) Install the EFI-MAIN NO. 2 relay. (12) Install the No. 1 engine room relay block and No. 1 junction block assembly cover. (b) When discharging fuel system pressure by disconnecting the fuel pump connector: (1) Disconnect the rear center seat outer belt assembly. Click here
(2) Remove the rear seat cushion assembly. Click here (3) Remove the rear seat cushion lock hook. Click here (4) Using a clip remover with its tip wrapped with protective tape, remove the rear floor service hole cover and butyl tape. 
 (5) Disconnect the fuel pump connector. (6) Remove the V-bank cover sub-assembly. Click here
(7) Disconnect the No. 6 engine wire connector and No. 7 engine wire connector. (8) Start the engine. After the engine has stopped on its own, turn the engine switch off. NOTICE: Do not increase the engine speed or drive the vehicle while waiting for the engine to stop on its own. (9) Crank the engine again and make sure that the engine does not start. HINT: DTC P008700 (Fuel Rail / System Pressure - Too Low), P017100/P017400 (System Too Lean), P160300 (Engine Stall History), P160400 (Startability Malfunction) or P160500 (Rough Idling) may be stored. Clear the DTCs before proceeding to the next step. Click here
(10) Remove the fuel tank cap assembly and discharge the pressure from the fuel tank assembly. (11) Disconnect the cable from the negative (-) battery terminal. NOTICE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected. Click here (12) Connect the No. 6 engine wire connector and No. 7 engine wire connector. (13) Install the V-bank cover sub-assembly. Click here
(14) Remove any remaining butyl tape from the rear floor service hole cover and vehicle body. (15) Clean the installation surfaces of the rear floor service hole cover and vehicle body. (16) Connect the fuel pump connector. (17) Install the rear floor service hole cover with new butyl tape. NOTICE: Securely install the rear floor service hole cover. 
(18) Install the rear seat cushion lock hook. Click here
(19) Install the rear seat cushion assembly. Click here (20) Connect the rear center seat outer belt assembly. Click here FUEL LINE (a) When disconnecting a high-pressure fuel line, a large amount of fuel will spray. Perform the following procedure: (1) Discharge fuel system pressure. (2) Disconnect the fuel tube. (3) Drain the fuel remaining inside the fuel pump tube into a container. (4) Cover the disconnected fuel pipe and fuel tube connector with plastic bags to prevent damage and contamination. (b) Quick Type A: Perform the following procedure when disconnecting a fuel tube connector. NOTICE: Remove any foreign matter on the fuel tube connector and fuel pipe before performing this work. (1) Disengage the 2 claws to remove the No. 2 fuel pipe clamp. 
 (2) Remove the No. 1 fuel pipe clamp from the fuel tube connector. (3) Check that there is no foreign matter around the fuel tube connector before disconnecting it. Clean it if necessary. (4) While holding the retainer at the positions shown in the illustration, pull up the retainer to disengage the lock claws. 
HINT: If the lock claws of the retainer are difficult to disengage, disengage them using a screwdriver with its tip wrapped with protective tape. 
(5) Pull up the retainer while holding it at the positions shown in the illustration and pull off the fuel tube connector. 
(6) If the fuel tube connector and fuel pipe are stuck, push and pull the fuel tube connector to release it. Pull the fuel tube connector off of the fuel pipe carefully. NOTICE:
(7) Check that there is no foreign matter on the sealing surfaces of the disconnected fuel lines. Clean them if necessary. (8) Cover the disconnected fuel pipe and fuel tube connector with plastic bags to prevent damage and contamination. (c) Quick Type A: Perform the following procedure when connecting a fuel tube connector. NOTICE: Check that there is no damage or foreign matter on the connecting parts of the fuel lines. (1) Align the fuel tube connector with the fuel pipe, push the fuel tube connector onto the fuel pipe, then push in the retainer to secure the connection. 
NOTICE: Confirm that the retainer makes a "click" sound when pushed. HINT: If it is difficult to push the fuel tube connector onto the fuel pipe, apply a small amount of clean gasoline to the tip of the fuel pipe. (2) After connecting the fuel lines, check that the fuel pipe and fuel tube connector are securely connected by pulling on them. (3) Install the No. 1 fuel pipe clamp to the fuel tube connector. (4) Engage the 2 claws to install the No. 2 fuel pipe clamp. (5) Inspect for fuel leaks. Click here (d) Quick Type B: Perform the following procedure when disconnecting a fuel tube connector. NOTICE: Remove any foreign matter on the fuel tube connector and fuel pipe before performing this work. (1) Pull out the retainer to disengage the lock claws and pull off the fuel tube connector. 
(2) If the fuel tube connector and fuel pipe are stuck, push and pull the fuel tube connector to release it. Pull the fuel tube connector off of the fuel pipe carefully. NOTICE: Do not scratch or allow any foreign matter to get on the parts when disconnecting them as the fuel tube connector has an O-ring that seals the pipe (fuel pipe). (3) Check that there is no foreign matter on the sealing surfaces of the disconnected fuel lines. Clean them if necessary. (4) Cover the disconnected fuel pipe and fuel tube connector with plastic bags to prevent damage and contamination. (e) Quick Type B: Perform the following procedure when connecting a fuel tube connector. NOTICE: Check that there is no damage or foreign matter on the connecting parts of the fuel lines. (1) Align the fuel tube connector with the fuel pipe, push the fuel tube connector onto the fuel pipe, then push in the retainer to secure the connection. 
NOTICE: Confirm that the retainer makes a "click" sound when pushed. HINT: If it is difficult to push the fuel tube connector onto the fuel pipe, apply a small amount of clean gasoline to the tip of the fuel pipe. (2) After connecting the fuel lines, check that the fuel pipe and fuel tube connector are securely connected by pulling on them. (3) Inspect for fuel leaks. Click here (f) Quick Type C: Perform the following procedure when disconnecting a fuel tube connector. NOTICE: Remove any foreign matter on the fuel tube connector and fuel pipe before performing this work. (1) Pull out the retainer to disengage the lock claws and pull off the fuel tube connector. 
(2) If the fuel tube connector and fuel pipe are stuck, push and pull the fuel tube connector to release it. Pull the fuel tube connector off of the fuel pipe carefully. 
NOTICE: Do not scratch or allow any foreign matter to get on the parts when disconnecting them as the fuel tube connector has O-rings that seal the pipe (fuel pipe). (3) Check that there is no foreign matter on the sealing surfaces of the disconnected fuel lines. Clean them if necessary. (4) Cover the disconnected fuel pipe and fuel tube connector with plastic bags to prevent damage and contamination. (g) Quick Type C: Perform the following procedure when connecting a fuel tube connector. NOTICE: Check that there is no damage or foreign matter on the connecting parts of the fuel lines. (1) Align the fuel tube connector with the fuel pipe, push the fuel tube connector onto the fuel pipe, then push in the retainer to secure the connection. 
NOTICE: Confirm that the retainer makes a "click" sound when pushed. HINT: If it is difficult to push the fuel tube connector onto the fuel pipe, apply a small amount of clean gasoline to the tip of the fuel pipe. (2) After connecting the fuel lines, check that the fuel pipe and fuel tube connector are securely connected by pulling on them. (3) Inspect for fuel leaks. Click here (h) Quick Type D: Perform the following procedure when disconnecting a fuel tube connector. NOTICE: Remove any foreign matter on the fuel tube connector and fuel pipe before performing this work. (1) Pull out the retainer to disengage the lock claws and pull off the fuel tube connector. 
(2) If the fuel tube connector and fuel pipe are stuck, push and pull the fuel tube connector to release it. Pull the fuel tube connector off of the fuel pipe carefully. NOTICE: Do not scratch or allow any foreign matter to get on the parts when disconnecting them as the fuel tube connector has O-rings that seal the pipe (fuel pipe). (3) Check that there is no foreign matter on the sealing surfaces of the disconnected fuel lines. Clean them if necessary. (4) Cover the disconnected fuel pipe and fuel tube connector with plastic bags to prevent damage and contamination. (i) Quick Type D: Perform the following procedure when connecting a fuel tube connector. NOTICE: Check that there is no damage or foreign matter on the connecting parts of the fuel lines. (1) Align the fuel tube connector with the fuel pipe, push the fuel tube connector onto the fuel pipe, then push in the retainer to secure the connection. 
NOTICE: Confirm that the retainer makes a "click" sound when pushed. HINT:
(2) After connecting the fuel lines, check that the fuel pipe and fuel tube connector are securely connected by pulling on them. (3) Inspect for fuel leaks. Click here (j) Observe the following precautions when handling a nylon tube: NOTICE:
FUEL SUCTION TUBE WITH PUMP AND GAUGE ASSEMBLY NOTICE:
INSPECT FOR FUEL LEAK (a) Check that there are no fuel leaks from the fuel system after doing any maintenance or repairs. Click here |
Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Occupant Classification System(for Gasoline Model): System Diagram
SYSTEM DIAGRAM Communication Table Transmitting ECU (Transmitter) Receiving ECU Signal Communication Method Airbag ECU Assembly Occupant Detection ECU Crash detection signal Acceleration signal CAN Skid Control ECU (Brake Actuator Assembly) Occupant Detection ECU Vehicle speed signal Occupant Detect ...
