Fuel Injector Inspection - Honda BF135A Manual

• Fuel Injector Inspection

When the engine is hard to start:
1) Disconnect the fuel injector connector and measure the
resistance between the terminals.
2) If the fuel injector is normal, check the following
• No.7 (10A) fuse
• No.4 (15A) fuse
• Open or short circuit in the injector harness (between
ECM, injectors and No.4 fuse) (P. 5-100).
When the engine starts:
1) Start the engine and warm it up.
2) With the engine running at idling, disconnect the fuel injec-
tor connector of each cylinder and check the idle speed
change and idling stability.
• The fuel injector is normal when the idling condition
changes.
• If the idling condition does not change when the fuel injec-
tor connector is disconnected, replace the fuel injector of
the cylinder and recheck the idling condition.
3) With the engine running at idling, check for the operation
sound of the fuel injectors using a sound scope (or with a
screwdriver or equivalent if a sound scope is not available).
• If there is no operation sound, replace the fuel injector
with a new one and recheck.
4) If no abnormality is detected, replace the ECM.
5-105
BF135A•BF150A