Troubleshooting the DFI System
After measurement, remove the needle adapters and ap-
ply silicone sealant to the seals [A] of the connector [B]
Sealant - Liquid Gasket, TB1211: 56019-120
Always check battery condition before replacing the DFI
parts. A fully charged battery is a must for conducting
accurate tests of the DFI system.
Trouble may involve one or in some cases all items.
Never replace a defective part without determining what
CAUSED the problem. If the problem was caused by
some other item or items, they too must be repaired or
replaced, or the new replacement part will soon fail again.
Measure the coil winding resistance when the DFI part is
cold (at room temperature).
Make sure all connectors in the circuit are clean and tight,
and examine leads for signs of burning, fraying, short,
etc. Deteriorated leads and bad connections can cause
reappearance of problems and unstable operation of the
If any wiring is deteriorated, replace the wiring.
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 the hand tester between the ends of the leads.
Special Tool - Hand Tester: 57001-1394
Set the tester to the × 1 Ω range, and read the tester.
If the tester does not read 0 Ω, the lead is defective. Re-
place the lead or the main harness [B] or the sub harness.
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.
FUEL SYSTEM (DFI) 3-25