Self-Diagnostic Function Table - Yamaha YFM7FGPW Service Manual

EAS27380

SELF-DIAGNOSTIC FUNCTION TABLE

If the ECU detects an abnormal signal from a sensor while the vehicle is being driven, the ECU illu-
minates the engine trouble warning light and provides the engine with alternate operating instruc-
tions that are appropriate for the type of malfunction.
When an abnormal signal is received from a sensor, the ECU processes the specified values that
are programmed for each sensor in order to provide the engine with alternate operating instructions
that enable the engine to continue to operate or stop operating, depending on the conditions.
Self-diagnostic function table
Fault
Item
code No.
12 Crankshaft position sensor
Intake air pressure sensor
13
(open or short circuit)
Intake air pressure sensor
14
(hose line)
Throttle position sensor (open
15
or short circuit)
16 Throttle position sensor
21 Coolant temperature sensor
Intake air temperature sen-
22
sor (open or short circuit)
Lean angle sensor (latch up
30
detected)
33 Ignition coil (faulty ignition)
39 Injector (open circuit)
Lean angle sensor (open or
41
short circuit)
42 Speed sensor
Fuel system voltage (monitor-
43
ing voltage)
Error in writing the amount of
44
CO adjustment on EEPROM
Vehicle system power supply
46
(Monitoring voltage)
ECU internal malfunction
50
(memory check error)
Communication error with the meter
Fault
Item
code No.
ECU internal malfunction
Er-1
(output signal error)
ECU internal malfunction
Er-2
(output signal error)
ECU internal malfunction
Er-3
(output signal error)
ECU internal malfunction
Er-4
(input signal error)
FUEL INJECTION SYSTEM
Symptom
No normal signals are received from the crankshaft
position sensor.
Intake air pressure sensor: open or short circuit
detected.
Intake air pressure sensor: hose system malfunction
(clogged or detached hose).
Throttle position sensor: open or short circuit
detected.
Stuck throttle position sensor detected.
Coolant temperature sensor: open or short circuit
detected.
Intake air temperature sensor: open or short circuit
detected.
The vehicle has overturned.
Malfunction detected in the primary wire of ignition
coil.
Injector: open circuit detected.
Lean angle sensor: open or short circuit detected.
No normal signals are received from the speed sen-
sor.
The ECU is unable to monitor the battery voltage (an
open or short circuit in the line to the ECU).
Error is detected while reading or writing on EEPROM
(CO adjustment value).
Power supply is not normal.
Faulty ECU memory. (When this malfunction is
detected in the ECU, the fault code number might not
appear on the meter).
Symptom
No signals are received from the ECU.
No signals are received from the ECU within the spec-
ified duration.
Data from the ECU cannot be received correctly.
Non-registered data has been received from the
meter.
6 - 6
FI
Able / unable Able / unable
to start to drive
Unable Unable
Able Able
Able Able
Able Able
Able Able
Able Able
Able Able
Unable Unable
Unable Unable
Unable Unable
Unable Unable
Able Able
Able Able
Able Able
Able Able
Unable Unable
Able / unable Able / unable
to start to drive
Unable Unable
Unable Unable
Unable Unable
Unable Unable