FUEL INJECTION SYSTEM
8-92
Fault code No. 50
Symptom ECU memory malfunction
Fail-safe action
Engine startup: Under certain conditions
Riding: Under certain conditions
Diagnostic monitor-
ing code No.
—
Meter display —
Checking method —
Item/components and
probable cause
Check or maintenance job
Sensor inspection proce-
dure
1 ECU malfunction Replace the ECU. Place the main switch to the
ON position.
Then, check that no fault
code indicated.
Fault code No. 59
Symptom Open or short circuit of accelerator position sensor lead
Fail-safe action
Engine startup: Possible under certain conditions
Riding: Possible under certain conditions
Diagnostic monitor-
ing code No.
D:14
D:15
D:14
Meter display
Accelerator position sensor signal 1
• 12–22 (fully closed position)
• 97–107 (fully opened position)
Checking
method
• Check with throttle grip fully closed.
• Check with throttle grip fully open.
D:15
Meter display
Accelerator position sensor signal 2
• 10–24 (fully closed position)
• 95–109 (fully opened position)
Checking
method
• Check with throttle grip fully closed.
• Check with throttle grip fully open.
Item/components and
probable cause
Check or maintenance job
Sensor inspection proce-
dure
1 Connection of accelerator
position sensor coupler
Check the connection of the
coupler is secure.
Remove the coupler, and
check each pin (for bending,
wear, or locking).
Poor connection → Connect
it securely, or repair/replace
the wire harness.
Place the main switch to the
ON position, and check the
fault code indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
2 Connection of main harness
ECU coupler
Check the connection of the
coupler is secure.
Remove the coupler, and
check each pin (for bending,
wear, or locking).
Poor connection → Connect
it securely, or repair/replace
the wire harness.
Place the main switch to the
ON position, and check the
fault code indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
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