Filter
Top Products
3-82 FUEL SYSTEM (DFI)
Fuel Injectors
Removal/Installation
•
Refer to t he Throttle Body Assy Disassembly/Assembly.
Audible Inspection
•
Start the engine.
•
Apply the tip of a screwdriver [A] to the injector [C]. Put
the grip end onto your ear, and listen whether the injector
is clicking or not.
○
A sound scope [B] can also be used.
•
Do the same for the other injectors.
If all the injectors click at a regular intervals, the injectors
are good. The trouble may be related to the fuel line,
requiring fuel pressure inspection (see Fuel Line section
in this chapter).
○
The click interval becomes shorter as the engine speed
rises.
If any injector(s) doesn’t click, the DFI circuit or the injector
is suspect. Perform “Power Source Voltage Inspection”,
first.
Power Source Voltage Inspection
•
Remove the ECU (see ECU section). Do not disconnect
the ECU connector.
•
Connect a digital meter [A] to the ECU connector [B], us-
ing the needle adapter [C].
Special Tool - Needle Adapter Set: 57001–1457
○
Measure the power source voltage with the engine
stopped, and with the connector joined.
•
Turn the ignition switch ON.
Injector Power Source Voltage at ECU
Connections: Meter (+) → W/Y (terminal 13)
Meter (–) → Battery (–) Terminal
Service Limit: Voltage (12.6 V or more)
If the meter doesn’t read as specified, check the following.
Main Fuse 30A (see Electrical System chapter)
Fuel P ump Relay (see DFI Power Source section)
Power Source Wiring (see Wiring diagram below)
○
To check the W/R leads between the injector connector
and the fuel pump relay, remove the fuel tank (see Fuel
Tank Removal) and the seat cover (see Frame chapter).
If the power source voltage is normal, check the output
voltage of the injectors.