3-110 FUEL SYSTEM (DFI)
Fuel Pump Power Source Voltage Inspection
Be sure the battery is fully charged.
Remove the ignition coil cover (see Ignition Coil Removal
in the Electrical System chapter).
Connect a digital meter [A] to the fuel pump connector [B]
(3P), using the needle adapter set [C].
Special Tool - Needle Adapter Set: 57001-1457
Measure the power source voltage with the engine
stopped, and with the pump connector joined.
Turn the ignition switch ON.
Pump Power Source Voltage
Connections to Pump Connector
Meter (+) → BK/Y lead [D]
Meter (–) → Battery (–) Terminal [E]
Battery Voltage (12.8 V or more)
Fuel Pump [F]
If the reading is good, the power source voltage is normal.
Inspect operating source voltage (see Fuel Pump Oper-
ating Voltage Inspection).
If the reading is incorrect, check the following.
Battery (see Charging Condition Inspection in the Elec-
trical System chapter)
Main Fuse 30 A (see Fuse Inspection in the Electrical
Ignition Fuse 10 A (see Fuse Inspection in the Electrical
Fuel Pump Relay (see Relay Circuit Inspection in the
Electrical System chapter)
Wiring for Fuel Pump Power Source (see next diagram)
Vehicle-down Sensor (see Vehicle-down Sensor Inspec-