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FUEL SYSTEM (DFI) 3-119
Fuel Pump
Fuel Pump Operating Voltage Inspection
NOTE
â—‹
Be sure the battery is fully charged.
•
Turn the ignition switch off.
•
Remove the front seat (see Front Seat Removal in the
Frame chapter).
•
Disconnect the fuel pump lead connector and connect
the measuring adapter [A] between these connectors as
shown.
Main Harness [B]
Fuel Pump [C]
Special Tool - Measuring Adapter: 57001-1700
•
Connect a digital meter [D] to the measuring adapter
leads.
Fuel Pump Operating Voltage
Connections to Adapter:
Digital Meter (+) → R (pump BK/Y) lead
Digital Meter (–) → BK (pump BK/W) lead
•
Measure the operating voltage with engine stopped and
with the connector joined.
•
Turn the engine stop switch run position.
•
Turn the ignition switch on.
Operating 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 wiring for con-
tinuity (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, but the pump does not op-
erate, replace the fuel pump (see Fuel Pump Removal/In-
stallation).
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