3-82 FUEL SYSTEM (DFI)
ECU Power Supply Inspection
Visually inspect the terminals of the ECU connector.
If the connector is clogged with mud or dust, blow it off
with compressed air.
Replace the main harness if the terminals [A] of the main
harness connectors are cracked, bent, or otherwise dam-
Replace the ECU if the terminals of the ECU connector
are cracked, bent, or otherwise damaged.
With the ECU connector [A] joined, check the following
ground leads for continuity with the ignition SW ON or
OFF, using a digital voltmeter [D].
ECU Grounding Inspection
10, 20, 32, or 42
(BK/Y) Terminal ←→ Battery (–) Terminal
11 (BR/BK) Terminal ←→ Battery (–) Terminal
Engine Ground Terminal [B] ←→ Battery (–) Terminal
0 Ω (regardless of the ignition SW ON or OFF)
If no continuity, check the connector, the engine ground
lead, or main harness, and repair or replace them if nec-
Battery [C] in the Frame
Special Tool - Needle Adapter Set: 57001–1457
Check the power source voltage of the ECU with a digital
ECU Power Source Inspection
Meter Connection: between 30 (W/R) Terminal and
Ignition SW OFF:
Ignition SW ON:
If the voltmeter does not read as specified, check the fol-
Power Source Wiring (see wiring diagram of DFI Power
Source section in this chapter).
DFI Fuse 15 A (see DFI Power Source section)
DFI Main Relay (see DFI Power Source section)
Ignition Fuse 10 A (see Electrical System chapter)
If the inspection checks good, the ECU is damaged. Re-
place the ECU. The ECU itself cannot be checked or ser-
Battery (–) Terminal
Battery Voltage (12.5 V or more)