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FUEL SYSTEM (DFI) 3-123
Fuel Injectors
Fuel Injector Power Source Voltage Inspection
NOTE
â—‹
Be sure the battery is fully charged.
•
Turn the ignition switch off.
•
Remove the throttle body assy with the connectors in-
stalled (see Throttle Body Assy Removal).
•
Disconnect the injector connector and connect the mea-
suring 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 measuring adapter lead.
Fuel Injector Power Source Voltage
Connections to Adapter:
For Fuel Injector #1, #2, #3, #4
Digital Meter (+) → R (injector R or 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 stays on battery voltage and never shows 0
V, check the fuel pump relay (see Relay Circuit Inspection
in the Electrical System chapter).
If the fuel pump relay is normal, check the ECU for its
ground and power supply (see ECU Power Supply In-
spection).
If the ground and power supply are good, replace the ECU
(see ECU Removal/Installation).
If there is still no battery voltage, check the fuel pump re-
lay (see Relay Circuit Inspection in the Electrical System
chapter).
If the fuel pump relay is normal, check the power source
wiring (see wiring diagram in this section).
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).
If the reading is in specification, check the output voltage
(see Fuel Injector Output Voltage Inspection).
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