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FUEL SYSTEM (DFI) 3-49
Self-Diagnosis
Service
Codes
Parts
Output Signal Usable
Range or Criteria
Backups by ECU
75
ECU Main
Relay
When the relay OFF
condition, the main relay is
open.
–
83
Oxygen
Sensor #2
(Europe
Models)
The oxygen sensor #2 is
active and sensor must
send signals (output
voltage) continuously to
the ECU.
If the oxygen sensor #2 is not activated, the
ECU stops feedback mode of the oxygen
sensor #1 and #2.
Note:
(1) α-N Method: the DFI control method from medium to heavy engine load. When the engine load
is light like at idling or l ow speed, the ECU determines the injection quantity by calculating from the
throttle vacuum (vacuum sensor output voltage) and engine speed (crankshaft sensor output voltage).
This method is called D-J method. As the engine speed increases, and the engine load turns middle
to heavy, the ECU determines the injection quantity by calculating from the throttle opening (throttle
sensor output voltage) and the engine speed. This method is called α-N method.
* This depends on the number of stopped cylinders.
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