Service manual

G420F(FE) Service Manual 245 Chapter 7. MPI Gasoune Fuel Delivery System
Injector Inspection
Operation check
Operation Sound Check
1. Using a stethoscope, check the injectors for a
clicking sound at idle. Check that the sound is
produced at shorter intervals as the engine speed
increases.
NOTE: Ensure that the sound from an adjacent
injector is not being transmitted along the delivery
pipe to an inoperative injector.
2. If a stethoscope is not available, check the
injector operation with your finger. If no vibrations
are felt, check the wiring connector, injector, or
injection signal from ECM.
Resistance Measurement Between
Terminals
1. Disconnect the connector at the injector and
measure the resistance between the two
terminals.
Standard value : 14.5 ± 0.35Ω [at 20℃ (68℉)]
2. Re-connect the connector to the injector.
Removal
1. Release residual pressure from the fuel line to
prevent fuel from spilling.
CAUTION
Cover the hose connection with rags to prevent
splashing of fuel that could be caused by
residual pressure in the fuel line.
2. Remove the delivery pipe with the fuel injectors.
CAUTION
Be careful not to drop any injectors when
removing the delivery pipe.
Be aware that fuel may flow out when removing
the injector.