SFI System: Precaution

HINT:

Any diagnostic trouble codes retained by the computer will be erased when the negative (-) terminal cable is removed from the battery. Therefore, if necessary, read the diagnosis before removing the negative (-) terminal cable from the battery.

1. In the event of engine misfire, the following precautions should be taken.
   1. Check proper connection to battery terminals, etc.
   2. After repair work, check that the ignition coil terminals and all other ignition system lines are reconnected securely.
   3. When cleaning the engine compartment, be especially careful to protect the electrical system from water.
2. Precautions when handling oxygen sensor.
   1. Do not allow the oxygen sensor to drop or hit against an object.
   2. Do not allow the sensor to come into contact with water.

      If vehicle is equipped with Mobile Radio System (HAM, CB, etc.) If the vehicle is equipped with a mobile communication system, See INTRODUCTION .

1. Separation of the engine oil dipstick, oil filler cap, PCV hose, etc. may cause the engine to stop turning.
2. Disconnection, looseness or cracks in the air induction system between the throttle body and cylinder head will allow air suction and cause the engine to stop turning.

1. Before removing SFI wiring connectors, terminals, etc., first disconnect the power by either turning the ignition switch to LOCK or disconnecting the negative (-) terminal cable from the battery.

   HINT:

   Always check the diagnostic trouble code before disconnecting the negative (-) terminal cable from the battery.

2. When installing the battery, be sure to correctly connect the positive (+) and negative (-) cables.
3. Be careful that parts do not receive a severe impact during removal or installation. Handle all SFI parts carefully, especially the ECM.
4. Be careful during troubleshooting, as there are numerous transistor circuits, and even slight terminal contact can cause further troubles.
5. Do not open the ECM cover.
6. When inspecting during rainy weather, be careful of water entry. Also, when washing the engine compartment, prevent water from getting on the SFI parts and wiring connectors.
7. Parts should be replaced as an assembly.
8. Care should be taken when pulling out and inserting wiring connectors.
   1. Release the lock and pull out the connector, pulling on the connectors.
   2. Fully insert the connector and check that it is locked.
9. Use SST for inspection or test of the injector or its wiring connector.

   SST 09842-30080

   Fig 1: Identifying SST

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Disconnecting Fuel Pump Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. When disconnecting the high fuel pressure line, a large amount of gasoline will spill out, so observe the following procedures.
   1. Disconnect the fuel pump connector.
   2. Start the engine. After the engine has stopped on its own, turn the ignition switch to LOCK.
   3. Disconnect the fuel tube (See REMOVAL  ).
   4. Drain the fuel remaining inside the fuel tube.
   5. Prevent the disconnected fuel tube from damage or foreign matter contamination by covering it with a vinyl bag.
      Fig 3: Covering Fuel Tube With Vinyl Bag

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   6. Put a container under the connection.
      Fig 4: Putting Container Under Connection

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Observe the following precautions when removing and installing the injector.
   1. Never reuse the O-ring.
   2. When placing a new O-ring on the injector, be careful not to damage it in any way.
   3. Coat a new O-ring with spindle oil or gasoline before installing. Never use engine, gear or brake oil.
      Fig 5: Identifying Correct Way Of Removing And Installing Injector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Before installing the injector, be sure to apply spindle oil or gasoline on the area where the delivery pipe or cylinder head touches the O-ring or injector grommet. Install the injector to the delivery pipe and cylinder head, as shown in Fig 6 .
   Fig 6: Installing Injector To Delivery Pipe

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Observe the following precautions when disconnecting the fuel delivery pipe. The structure of the metallic connector is shown in Fig 7 .
   1. Remove the fuel pipe clamp.
      Fig 7: Structure Of Metallic Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Grasp the metallic connector of the fuel tube assembly, pull it rearwards and hold in place.
   3. Assemble SST to the connection as shown in Fig 8.

      SST 09268-21010

      Fig 8: Assembling SST To Connection

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Turn the SST, align the retainers inside the connector with SST chamfered parts and insert the SST into the connector.
      Fig 9: Aligning Retainers Inside Connector With SST Chamfered Parts

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   5. Hold the SST in position (as in step 4), push the connector towards the SST to place the retainers on SST chamfered parts.
   6. Slide the SST and the connector together towards the fuel tube assembly.
      Fig 10: Pushing Connector Towards SST

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Observe the following precautions when disconnecting the fuel tube connector (quick type).
   1. Remove the fuel pipe clamp.
   2. Check if there is any dirt, such as mud, on the pipe and around the connector before disconnecting them and clean the dirt away.
      Fig 11: Disconnecting Fuel Tube Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Be sure to disconnect by hand.
   4. When the connector and the pipe are stuck, pinch the retainer between the hands, push and pull the connector to disconnect and pull it out. Do not use any tool at this time.
   5. Inspect if there is any dirt or foreign matter on the seal surface of the disconnected pipe and clean it away.
      Fig 12: Disconnecting Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   6. Prevent the disconnected pipe and connector from damage or foreign matter contamination by covering them with a vinyl bag.
      Fig 13: Covering Pipe And Connector With Vinyl Bag

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Observe the following precautions when connecting the fuel tube connector (quick type).
   1. Do not reuse the retainer removed from the pipe.
   2. Be sure to remove the retainer from the pipe by hand, not with a tool.
   3. Check if there is any damage or foreign objects on the connected part of the pipe.
      Fig 14: Locating Retainer

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Align the connector axis with the pipe axis, and push in the connector until the retainer makes a "click" sound. If the connection is tight, apply a small amount of new engine oil on the tip of the pipe.
   5. After the connection is completed check if the pipe and the connector are securely connected by pulling them.
      Fig 15: Pushing Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   6. Install the fuel pipe clamp.
   7. Check if there is any fuel leakage.
7. Observe the following precautions when handling the nylon tube.
   1. Be careful not to forcibly turn the connected part of the nylon tube and the quick connector when connecting them.
   2. Be careful not to kink the nylon tube.
   3. Do not remove the nylon tube.
   4. Do not close the piping with the nylon tube by bending it.
      Fig 16: Installing Fuel Pipe Clamp

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
8. Check that there are no fuel leaks in the fuel system after performing an inspection.
   1. Connect the TOYOTA hand-held tester to the DLC3.
   2. Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON.
   3. Select the active test mode on the TOYOTA handheld tester.
   4. Refer to the TOYOTA HAND-HELD TESTER Operator's Manual for further details.
      Fig 17: Connecting Toyota Hand-Held Tester To DLC3

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   5. If you do not have a TOYOTA hand-held tester, connect the positive (+) and negative (-) leads from the battery to the fuel pump connector. (See FUEL PUMP  )
   6. Check that there are no leaks in the fuel system.
   7. Turn the ignition switch to LOCK.
   8. Disconnect the TOYOTA hand-held tester from the DLC3.