3-88 FUEL SYSTEM (DFI)
Refer to the Throttle Body Assy Disassembly/Assembly.
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).
The click interval becomes shorter as the engine speed
If any injector(s) doesn't click, the DFI circuit or the injector
is suspect. Perform "Fuel Injector Power Source Voltage
Fuel Injector Power Source Voltage Inspection
Remove the ECU (see ECU Power Supply Inspection).
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
Meter (+) → W/Y (terminal 16)
Meter (–) → Battery (–) Terminal
Service Limit: Voltage (12.6 V or more)
If the meter doesn't read as specified, check the following.
Main Fuse 30 A (see Fuse section in the Electrical Sys-
Fuel Pump Relay (see Relay Circuit Inspection in the
Electrical System chapter)
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 left side cover (see Side Cover
Removal in the Frame chapter).
If the power source voltage is normal, check the output
voltage of the injectors.