Self-Diagnosis - Yamaha YZF-R1K Service Manual

EB812000

SELF-DIAGNOSIS

The YZF-R1 features a self-diagnosing system for the following circuit(-s):
• throttle position sensor
• EXUP
• fuel level indicator light
If any of these circuits are defective, their respective condition codes will be displayed on the
tachometer when the main switch is set to "ON" (irrespective of whether the engine is run-
ning or not)
Circuit
Throttle posi-
tion sensor
EXUP
Fuel level indi-
cator light
Tachometer display sequence
8
When more than one item is being monitored, the tachometer needle displays the condition
codes in ascending order, cycling through the sequence repeatedly.
If the engine is stopped, the engine speed 3 is 0 r/min.
Defect(-s)
• Disconnected • The ignitor unit stays set to the
• Short-circuit
• Locked
• The tachometer displays the
• Improper connec- • The EXUP valve stays in the
tion
• Short-circuit
• The tachometer displays the
• Servomotor is • The servomotor's power supply
locked.
• The tachometer displays the
• Improper connec-
• The tachometer displays the
tion
SELF-DIAGNOSIS
System response
wide-open throttle ignition tim-
ing. The motorcycle can be rid-
den.
condition code.
open position for three seconds
and then the servomotor shuts
off. The motorcycle can be rid-
den.
condition code.
is constantly interrupted so that
it will not burn out. The motorcy-
cle can be ridden.
condition code.
condition code.
8 - 58
– +
ELEC
Condition code
3,000 r/min
7,000 r/min
8,000 r/min