Fuel Delivery: SFI: Precaution

HINT:

Any diagnostic trouble code 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. Take following precautions to prevent the engine misfire.
   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. Take following precautions to handle the oxygen sensor.
   1. Do not drop the oxygen sensor or hit against an object.
   2. Do not allow the sensor to contact with water.

If the vehicle is equipped with a mobile communication system, refer to the precaution in INTRODUCTION .

1. Separation of the engine oil dipstick, oil filler cap, PCV hose, etc. may cause the engine to be out of tune.
2. Disconnection, looseness or cracks in the parts of the air induction system between the throttle body and cylinder head will cause air suction, which makes the engine out of tune.

1. Disconnect the power by either turning the ignition switch OFF or disconnecting the negative (-) terminal cable from the battery before removing SFI wiring connectors, terminals, etc.

   HINT:

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

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

   SST 09842-30070

   Fig 1: Identifying Wiring Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. When disconnecting the high fuel pressure line, a large amount of gasoline may be spilled:
   1. Disconnect the fuel pump connector.
   Fig 2: Disconnecting Fuel Pump Connector
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Start the engine. After the engine has stopped on its own, turn the ignition switch OFF.
   3. Put a container under the connection.
   4. Slowly loosen the connection.
   5. Disconnect the connection.
   6. Plug the connection with a rubber plug.
   7. Reconnect the fuel pump connector.
2. When connecting the union bolt (fuel pressure pulsation damper) on the high pressure pipe union, follow the procedure below:
   1. Always use 2 new gaskets.
   2. Tighten the union bolt by hand.
      Fig 3: Connecting Union Bolt

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Using SST, tighten the union bolt to the specified torque.

      SST 09612-24014 (09617-24011)

      Torque: 

      33 N.m (340 kgf.cm, 24 ft.lbf) for use with SST 

      39 N.m (400 kgf.cm, 29 ft.lbf) 

   Fig 4: Tightening Union Bolt Using SST

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   Use a torque wrench with a fulcrum length of 30 cm (11.81 in.).

3. When connecting the flare nut on the high pressure pipe union, follow the procedure below:
   1. Apply a light coat of engine oil to the flare nut, and tighten the flare nut by hand.
   2. Using SST, tighten the flare nut to the specified torque.

   SST 09023-12701

   Fig 5: Identifying Fulcrum Length

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002