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FUEL SYSTEM (DFI) 3-47
Self-Diagnosis
Backups
○
The ECU takes the following measures to prevent engine damage when the DFI, ignition or immo-
bilizer system parts have troubles.
Service
Codes
Parts
Output Signal Usable
Range or Criteria
Backups by ECU
11
Main Throttle
Sensor
Main Throttle Sensor
Output Voltage
0.2 ∼ 4.8 V
If the main throttle sensor system fails (the
signal is out of the usable range, wiring short
or open), the ECU locks ignition timing into the
ignition timing at closed throttle position and
sets the DFI in the D -J method.
12
Inlet Air
Pressure
Sensor
Inlet Air Pressure
(absolute)
Pv = 100 mmHg ∼ 900
mmHg
If the inlet air pressure sensor system fails (the
signal Pv i s out of the usable range, wiring
short or open), the ECU sets the DFI in the
α-N method (1).
13
Inlet Air
Temperature
Sensor
Inlet Air Temperature
Ta = – 30°C ∼ + 100°C
If the inlet air temperature sensor fails (the
signal is out of the usable range, wiring short
or open), the ECU sets Ta at 30°C.
14
Water
Temperature
Sensor
Water Temperature
Tw = – 30°C° ∼ + 120°C
If the water temperature sensor system fails
(the signal is out of the usable range, wiring
short or open), the ECU sets Tw at 80°C.
15
Atmospheric
Pressure
Sensor
Absolute Atmospheric
Pressure
Pa = 100 mmHg ∼ 900
mmHg
If the atmospheric pressure sensor system
fails (the signal is out of the usable range,
wiring short or open), the ECU sets Pa at 760
mmHg (the standard atmospheric pressure).
21
Crankshaft
Sensor
Crankshaft sensor cannot
send the signal to the ECU
during 8 crankings.
If crankshaft sensor fails, the engine stops by
itself.
23
Camshaft
Position
Sensor
Camshaft position sensor
cannot send the signal
to the ECU during 24
crankings.
If the camshaft position sensor system fails
(the signal is missing, wiring short or open),
the ECU continues to ignite cylinders in the
same sequence following the last good signal.
24
Speed
Sensor
Speed sensor must send
4 signals (output signal) to
the ECU at the one rotation
of the drive shaft.
If the speed sensor system fails (no signal,
wiring short or open), the speedometer shows
0.
25
Gear
Position
Switch
Gear Position Switch
Output Voltage (signal)
Vg = 0.2 ∼ 4.8 V
If the speed sensor system fails (no signal,
wiring short or open), the ECU set the top (6)
gear position.
31
Vehicle
-down
Sensor
Vehicle-down Sensor
Output Voltage (signal)
Vd = 0.2 V ∼ 4.8 V
If the vehicle-down sensor system has failures
(the output voltage Vd is more than usable
range, wiring open), the ECU shuts off the
fuel pump, the fuel injectors and the ignition
system.
32
Subthrottle
Sensor
Subthrottle Sensor Output
Voltage
0.2 ∼ 4.8 V
If the subthrottle sensor system fails (the
signal is out of the usable range, wiring short
or open), the actuator locks subthrottle valve
at full open position.
33
Oxygen
Sensor #1
(Europe
Models)
The oxygen sensor #1 is
active and sensor must
send signals (output
voltage) continuously to
the ECU.
If the oxygen sensor #1 is not activated, the
ECU stops feedback mode of the oxygen
sensor #1 and #2.
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