INSTRUMENT AND CONTROL FUNCTIONS
3-7
3
EAU00106
Diagnosis deviceThis model is equipped with a self diag-
nosis for the following circuits.l
Throttle Position Sensor (T.P.S.)
circuit
l
Exhaust Ultimate Power valve
(EXUP) circuit
l
Fuel level indicator circuit
If some trouble should occur in any of
these circuits, the tachometer will re-
peatedly display as follows:
CB-53E
Use this chart to identify what circuit is
faulty according to the specified r/min
displayed.CB-54EIf the tachometer displays as described
above, take note of the specified r/min
and then take your motorcycle to a
Yamaha dealer for repair.
EC000004
CAUTION:@ To prevent engine damage, be sure
to consult a Yamaha dealer as soon
as possible if the tachometer dis-
plays a repeated change in r/min. @
EAU01652
Coolant temperature gaugeThis gauge indicates the coolant tem-
perature when the main switch is on.
The engine operating temperature will
vary with changes in weather and en-
gine load. If the needle points to the red
zone or higher, stop your motorcycle
and let the engine cool. (See page 6-11
for details.)
EC000002
CAUTION:@ When the engine is overheated, do
not continue riding. @
0 r/min for
3 seconds
Specified r/min
for the faulty
circuit for
2.5 seconds
(see chart below)
Current
engine
r/min for
3 seconds
Specified
r/min
Faulty circuit
3,000 r/min
Throttle Position Sensor
(T.P.S.)
7,000 r/min
Exhaust Ultimate Power
valve (EXUP)
8,000 r/min
Fuel level indicator
1. Coolant temperature gauge
2. Red zone
E_4sv_Functions.fm Page 7 Tuesday, August 31, 1999 3:42 PM
PERIODIC MAINTENANCE AND MINOR REPAIR
6-36
6
Engine overheating
EW000070
WARNING
@ Do not remove the radiator cap when the engine and radiator are hot. Scalding hot fluid and steam may be blown
out under pressure, which could cause serious injury. Open the radiator cap as follows. Wait until the engine has
cooled. Remove the radiator cap stopper by removing the screw. Place a thick rag like a towel over the radiator cap
and slowly rotate the cap counterclockwise to the detent. This procedure allows any residual pressure to escape.
When the hissing sound has stopped, press down on the cap while turning counterclockwise and remove it. @NOTE:@ If it is difficult to get the recommended coolant, tap water can be temporarily used, provided that it is changed to the recom-
mended coolant as soon as possible. @
Wait until the
engine has cooled.
Check the coolant level in the
reservoir tank and/or radiator.
Level is OK.Level is low, check the
cooling system for leakage.
No
leakage.Leakage.
Ask a Yamaha dealer to inspect
and repair the cooling system.Add coolant. (See NOTE.)
Restart the engine. If the engine overheats again, ask a
Yamaha dealer to inspect and repair the cooling system.
E_4sv_Periodic.fm Page 36 Tuesday, August 31, 1999 3:45 PM
