Yamaha YP400T, YP400V, YP400W Service Manual page 299

Fault
Symptom
Code No.
An error is detected while reading or
44 writing on EEPROM.
Power supply to the FI system is not
46
normal.
Faulty ECU memory. When this mal-
50 function is detected, the code number
might not appear on the meter.
ISC (idle speed control) valve open or
61 short circuit is detected.
No signals are received from the
Er-1 ECU.
No signals are received from the ECU
Er-2 within the specified duration.
Data from the ECU cannot be
Er-3 received correctly.
Non-registered data has been
Er-4 received from the meter.
EAS00907
Diagnostic mode table
Switch the meter display from the regular mode to the diagnostic mode. To switch the display, refer
to "DIAGNOSTIC MODE".
NOTE:
_
• Check the intake air temperature and coolant temperature as close as possible to the intake air
temperature sensor and the coolant temperature sensor respectively.
• If it is not possible to check the intake air temperature, use the ambient temperature as reference.
Diagnostic
Item
code
Throttle angle
01
Pressure difference
(atmospheric pressure-
intake air pressure)
03
Intake air temperature
05
Coolant temperature
06
Vehicle speed pulse
07
Lean angle cut-off switch
08
FUEL INJECTION SYSTEM
Probable cause of malfunction
• Malfunction in ECU. (The CO adjustment value and
throttle valve fully closed notification value are not prop-
erly written on or read from the internal memory.)
• Malfunction in charging system.
• Malfunction in ECU. (The program and data are not
properly written on or read from the internal memory.)
• Open or short circuit in wiring harness.
• Defective ISC (idle speed control) valve.
• Malfunction in ECU.
• Open or short circuit in wiring sub lead.
• Malfunction in meter.
• Malfunction in ECU.
• Improper connection in wiring sub lead.
• Malfunction in meter.
• Malfunction in ECU.
• Improper connection in wiring sub lead.
• Malfunction in meter.
• Malfunction in ECU.
• Improper connection in wiring sub lead.
• Malfunction in meter.
• Malfunction in ECU.
Description of action
Displays the throttle angle.
• Check with throttle fully closed.
• Check with throttle fully open.
Displays the pressure difference (atmospheric pres-
sure-intake air pressure).
Engine stop switch is on.
• Generate the pressure difference by cranking the
engine with the starter, without actually starting the
engine.
Displays the intake air temperature.
• Check the temperature in the air cleaner case.
Displays the coolant temperature.
• Check the temperature of the coolant.
Displays the accumulation of the vehicle pulses that
are generated when the tire is spun.
Displays the lean angle cut-off switch values.
7 - 10
FI
Diagnostic code
60
—
—
54
—
—
—
—
Data displayed on meter
(reference value)
0 ~ 125 degrees
• Fully closed position (15 ~ 16)
• Fully open position (97 ~ 102)
When engine is stopped:
Atmospheric pressure 101.3 kPa
(760 mmHg, 30 inHg) when cranking
the engine with the start switch.
2
0 ~ 126 kPa (1.26 kgf/cm , 17.9 psi)
Compare it to the value displayed on
the meter.
Compare it to the value displayed on
the meter.
(0 ~ 999; resets to 0 after 999)
OK if the numbers appear on the
meter.
Upright: 0.4 ~ 1.4 V
Overturned: 3.8 ~ 4.2 V