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3-40 FUEL SYSTEM (DFI)
Self-Diagnosis

Backups

Backups
The ECU takes the following measures to prevent engine damage when the DFI or the ignition
system parts have troubles.
Service
Parts
Codes
Main Throttle
11
Sensor
Inlet Air
12
Pressure
Sensor
Inlet Air
13
Temperature
Sensor
Water
14
Temperature
Sensor
Crankshaft
21
Sensor
24
and
Speed Sensor
25
Vehicle-down
31
Sensor
Subthrottle
32
Sensor
Oxygen Sensor
33
(Europe Model)
Output Signal Usable
Range or Criteria
Main Throttle Sensor
Output Voltage
0.20 ∼ 4.8 V
Inlet Air Pressure
(absolute)
Pv = 150 mmHg ∼ 800
mmHg
Inlet Air Temperature
Ta = –30°C ∼ +120°C
Water Temperature
Tw = –30C° ∼ +120°C
Crankshaft sensor must
send 22 signals (output
signal) to the ECU at
the one cranking.
Speed sensor must
send 4 signals (output
signal) to the ECU at
the one rotation of the
engine sprocket.
The gear position is
decided by the signal of
the speed sensor.
Vehicle-down Sensor
Output Voltage (signal)
Vd = 0.65 V ∼ 4.45 V
Subthrottle Sensor
Output Voltage
0.15 ∼ 4.85 V
The oxygen sensor is
active and sensor must
send signals (output
voltage) continuously to
the ECU.
Backups by ECU
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.
Also, the main throttle sensor system and
inlet air pressure fails, the ECU locks ignition
timing into the ignition timing at closed throttle
position and sets the DFI in the α-N method.
If the inlet air pressure sensor system fails (the
signal Pv is out of the usable range, wiring
short or open), the ECU sets the DFI in the α
- N method.
If the inlet air temperature sensor fails (the
signal is out of the usable range, wiring short
or open), the ECU sets Ta at 40°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.
If crankshaft sensor generates other than 22
signals, the engine stops by itself.
If the speed sensor system fails (no signal,
wiring short or open), the speedometer shows
0, and the ECU sets the top (6) gear position.
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.
If the subthrottle sensor system fails (the
signal is out of the usable range, wiring short
or open), the actuator locks sub throttle valve
at full open position.
If the oxygen sensor is not activated, the ECU
stops oxygen sensor feedback mode.

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   Also See for Kawasaki ER-6n

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