Fuel Injector: Service and Repair
INJECTORREMOVAL AND INSTALLATION
CAUTION: When the fuel injector replacement is performed, use scan tool MB991958 to initialize the learning value (Refer to general (body and chassis), Initialization Procedure for Learning Value in MFI Engine).
Pre-removal & Post-installation Operation:
Removal Steps 1-19:
REMOVAL SERVICE POINTS
[[A]] FUEL HIGH-PRESSURE HOSE DISCONNECTION
CAUTION: Do not kink the fuel high-pressure hose as it is made of plastics and will become damaged.
1. Insert a flat-tipped screwdriver [width 6 mm (0.24 inch), thickness 1 mm (0.04 inch)] to the retainer.
2. Turn the flat-tipped screwdriver approximately 90 degrees to the arrowed direction, and lift the retainer to unlock and disconnect the fuel high-pressure hose.
[[B]] FUEL RAIL AND FUEL INJECTOR ASSEMBLY REMOVAL
CAUTION: Do not drop the injector.
Remove the fuel rail with the injectors attached to it.
INSTALLATION SERVICE POINTS
]]A[[ FUEL INJECTOR ASSEMBLY INSTALLATION
CAUTION: Do not let the engine oil get into the fuel rail.
1. Apply a drop of new engine oil to the O-ring.
2. Turn the injector to the right and left to install to the fuel rail. Be careful not to damage the O-ring. After installing, check that the item turns smoothly.
3. If it dose not turn smoothly, the O-ring may be trapped, remove the item, re-install it into the fuel rail and check again.
]]B[[ FUEL HIGH-PRESSURE HOSE CONNECTION
1. Pull up the retainer of fuel high-pressure hose to unlock before installing.
2. Install the fuel high-pressure hose to the fuel rail securely and push the retainer of fuel high-pressure hose downward and lock thoroughly.
3. After installing, slightly pull the fuel high-pressure hose and ensure that there is no disengaged fuel high-pressure hose. Also confirm that there is approximately 1 mm (0.04 inch) play at this time.