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3-118 FUEL SYSTEM (DFI)
Fuel Injectors
Fuel Injector Power Source Voltage Inspection
NOTE
○
Be sure the battery is fully charged.
•
Remove the air cleaner housing (see Air Cleaner Housing
Removal).
•
Turn the ignition switch OFF.
•
Disconnect the injector connector and connect the har-
ness adapter [A] between these connectors as shown.
Main Harness [B]
Fuel Injector #1 [C]
Special Tool - Measuring Adapter: 57001-1700
•
Connect a digital meter [D] to the harness adapter lead.
Fuel Injector Power Source Voltage
Connections to Adapter:
For Fuel Injector #1, #2, #3, #4
Digital Meter (+) R (injector W/R) lead
Digital Meter (–) Battery (–) terminal
•
Measure the power source voltage with the engine
stopped.
•
Turn the engine stop switch to run position.
•
Turn the ignition switch ON.
Power Source Voltage
Standard: Battery Voltage for 3 seconds, and then 0 V
•
Turn the ignition switch OFF.
If the reading is not the standard, check the ECU main
relay and fuel pump relay (see Relay Circuit Inspection in
the Electrical System chapter).
If the main relay and pump relay are normal, check the
wiring (see Fuel Injector Circuit).
If the wiring is good, check the ECU for its ground and
power supply (see ECU Power Supply Inspection).
If the ground and power supply are good, replace the ECU
(see ECU Removal/Installation).
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