Service Code Reading
Service codes are shown by a series of long and short blinks of the FI indicator LED light as shown
Read 10th digit and unit digit as the FI indicator LED light blinks.
When there are a number of problems, all the service codes can be stored and the display will
begin starting from the lowest number service code in the numerical order. Then after completing
all codes, the display is repeated until the ignition SW is turned OFF.
For example, if four problems occurred in the order of 31, 15, 41, 12, the service codes are displayed
from the lowest number in the order listed.
(12 → 15 → 31 → 41) → (12 → 15 → 31 → 41) → · · · (repeated)
If there is no problem or when the repair has been done, no service code is shown.
If the problem is with the following parts, the ECU cannot memorize these problems, the FI indicator
LED light doesn't go on, and no service 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 resistance, 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 service code 12 and 15 are shown as follows.
Each service code is continuously repeated three times until the ignition SW is turned OFF.
Service Code Erasing
When the repair has been done, the LED light will not show service codes any more.
But even if the repair has been done, the ignition SW is turned OFF, or the battery is disconnected,
all the service codes remain in the ECU, which need not be absolutely erased.
FUEL SYSTEM (DFI) 3-41