2-74 FUEL SYSTEM (DFI)
How to Read Fault Codes
Fault codes are shown by a series of long and short blinks
of the FI indicator LED light as shown below.
Read 10th digit and unit digit as the FI indicator LED light
When there are a number of problems, all the fault codes
can be stored and the display will begin starting from the
lowest number fault code in the numerical order. Then
after completing all codes, the display is repeated until
the ignition switch is turned OFF.
For example, if four problems occurred in the order of 31,
15, 41, 12, the fault codes are displayed from the lowest
number in the order listed.
(12 → 15 → 31 → 41) → (12 → 15 → 31 → 41) → · · ·
If there is no problem or when the repair has been done,
no fault code is shown.
If the problem is with the following parts, the ECU can-
not memorize these problems, the FI indicator LED light
doesn't go on, and no fault codes can be displayed.
FI Indicator LED Light
Pressure Regulator (Fuel Pressure, Fuel Flow Rate)
DFI Main Relay
Ignition Coil Secondary Wiring (check the internal resis-
tance, see Electrical System chapter)
ECU Power Source Wiring and Ground Wiring (see ECU
Inspection in this chapter)
For example, if two problems of 12 and 15 occur, the fault
code 12 and 15 are shown as follows.
Each fault code is continuously repeated three times.