Service Manual (KLZ1000C) — page 112 of 762

Fuel System (DFI) › Outline
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3-28 FUEL SYSTEM (DFI)
Troubleshooting the DFI System

• Pull  each connector [A] apart and inspect it for corrosion,
  dirt, and damage.
 If the connector is corroded or dirty, clean it carefully. If it
 is damaged, replace it. Connect the connectors securely.
•Check the wiring for continuity.
○Use the wiring diagram to find the ends of the lead which
 is suspected of being a problem.
○Connect a tester between the ends of the leads.
 If the tester does not read about 0 Ω, the lead is defective.
 Replace the lead or the main harness or the subharness.

○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 wiring, connectors, and
    DFI parts, replace the ECU.