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3-28 FUEL SYSTEM (DFI)
Troubleshooting the DFI S ystem
○
If both ends of a harness [A] are far apart, ground [B] the
one end [C], using a jumper lead [D] and check the con-
tinuity between the end [E] and the ground [F]. This en-
ables to check a long harness for continuity. If the harness
is open, repair or replace the harness.
○
When checking a harness [A] for short circuit, open one
end [B] and check the continuity between the other end
[C] and ground [D]. If there is continuity, the harness has
a short circuit to ground, and it must be repaired or re-
placed.
•
Narrow down suspicious locations by repeating the con-
tinuity tests from the ECU connectors.
If no abnormality is found in the wiring or connectors, the
DFI parts are the next likely suspects. Check the part,
starting with input and output voltages. However, there is
no way to check the ECU itself.
If an abnormality is found, replace the affected DFI part.
If no abnormality is found in the w iring, connectors, and
DFI parts, replace the ECU.
○
The diagnosis flow chart illustrates the above procedures.
○
After inspection, be sure to connect all the DFI electrical
connectors. Do not turn the ignition switch ON while the
DFI electrical connectors and ignition system connectors
are disconnected. Otherwise, the ECU memorizes ser-
vice codes as open circuit.
○
Lead Color Codes:
BK: Black
G: Green
P: Pink
BL: Blue
GY: Gray
PU: Purple
BR: Brown LB: Light Blue R: Red
CH: Chocolate LG: Light Green
W: White
DG: Dark Green O: Orange
Y: Y ellow
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