Honda CBR650 - Service manual > Fuel injector

REMOVAL/INSTALLATION

Remove the air cleaner housing.

Disconnect the fuel injector 2P (Black) connectors [1] Remove the following:

• Four bolts [2]
• Fuel rails/joint [3] and fuel injectors [4] (as an assembly)

• Fuel injectors [1]
• Seal rings [2]
• O-rings [3]

• Fuel rails [1]
• Fuel rail joint [2]
• O-rings [3]

Check each part for wear or damage and replace it if necessary.

Installation is in the reverse order of removal.

NOTE:

• Replace the O-rings and seal rings with new ones and coat them with engine oil.
• Install the fuel injector by aligning the injector connector with the groove of the fuel rail.
• When installing the fuel injector, be careful not to damage the O-ring and seal ring.

TORQUE:
 Fuel injector joint bolt:
  5.1 N*m (0.5 kgf*m, 3.8 lbf*ft)

IACV

INSPECTION

• The IACV is installed on the throttle body and is operated by the stepping motor. When the ignition switch is turned ON, the IACV operates for a few seconds.

Turn the ignition switch ON with the engine stop switch "" and check the IACV.

If the operating sound is not heard with no MIL blinking, perform the following inspection.

Remove the IACV.

Check the IACV slide valve [1] and IACV air passage in the throttle body for carbon deposits.

Check the O-ring [2] on the IACV for deterioration or damage.

Temporarily connect the IACV 4P (Black) connector [3].

Turn the ignition switch ON with the engine stop switch "" while holding the slide valve lightly.

The slide valve should move back and forth.

Turn the ignition switch OFF.

Install the removed parts in the reverse order of removal.

REMOVAL

Remove the air cleaner housing.

Disconnect the IACV 4P (Black) connector [1].

Remove the following:

• Two screws [2]
• Setting plate [3]
• IACV [4]
• O-ring [5]

INSTALLATION

Replace the O-ring [1] with a new one (do not apply oil).

Turn the slide valve [2] clockwise until it is seated lightly and install the IACV [3] by aligning the long slot with the pin on the throttle body.

Install the setting plate [1] by aligning the cutout with the lug of the IACV body.

Install and tighten the screws to the specified torque.

TORQUE: 2.1 N*m (0.2 kgf*m, 1.5 lbf*ft)

Connect the IACV 4P (Black) connector [2].

Install the air cleaner housing.

Fuel pump relay

CIRCUIT INSPECTION

For relay inspection.

Remove the fuel pump relay.

RELAY SWITCH/COIL POWER INPUT LINE

Measure the voltage between each fuel pump relay 4P connector [1] terminal and ground.

CONNECTION:
B (+) - Ground (-)
D (+) - Ground (-)

There should be battery voltage when the ignition switch is turned ON with the engine stop switch "".

If there is no voltage, check the following:

• Black/white wire in the relay connector between the main relay and fuel pump relay for open circuit
• CBR650F/FA: Black/yellow or Black/red wire between the engine stop switch and fuel pump relay for open circuit
• CB650F/FA: Black/yellow wire between the engine stop switch and fuel pump relay for open circuit
• Main relay and its circuit

SIGNAL LINE

Check for continuity between the fuel pump relay 4P connector [1] terminal and ground.

CONNECTION: C - Ground

There should be no continuity with the ignition switch OFF.

If there is continuity, check for short circuit in the Brown/ black wire between the relay connector and ECM.

There should be continuity for a few seconds when the ignition switch is turned ON with the engine stop switch "".

If there is no continuity, check for open circuit in the Brown/black wire between the relay connector and ECM.

See also: