Self-Diagnosis - Yamaha YZF-R1 2000 Supplementary Service Manual

EB812000

SELF-DIAGNOSIS

The YZF-R1 features a self-diagnosing system for the following circuit(-s):
S throttle position sensor
S EXUP
S speed sensor
S fuel level warning light
If any of these circuits are defective, their respective condition codes will be displayed on the tachome-
ter when the main switch is set to "ON" (irrespective of whether the engine is running or not)
Circuit
S Disconnected
Throttle posi-
S Short-circuit
tion sensor
S Locked
S Improper connec-
EXUP
tion
S Short-circuit
S Servomotor is
locked.
S Disconnected
Speed sensor
S Short-circuit
S Improper connec-
Fuel level
warning light tion
S Short-circuit
Tachometer display sequence
Revolution
3
( 10 r / min)
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)
S The ignitor unit stays set to the
wide-open throttle ignition timing.
The motorcycle can be ridden.
S The tachometer displays the
condition code.
S The EXUP valve stays in the open
position for three seconds and
then the servomotor shuts off. The
motorcycle can be ridden.
S The tachometer displays the
condition code.
S The servomotor's power supply is
constantly interrupted so that it
will not burn out. The motorcycle
can be ridden.
S The tachometer displays the
condition code.
S The tachometer displays the
condition code.
S Display the condition code on the
fuel level warning light.
Tachometer display
SELF-DIAGNOSIS
System response
1
2
3
Engine speed
Time (seconds)
–66–
ELEC
Condition code
3,000 r/min
7,000 r/min
4000 r/min
The warning light
will flash eight
times, then go off
for three seconds.
0 r / min ... 3 seconds
Condition code ... 2.5 seconds
Engine speed ... 3 seconds