Yamaha Waverunner 3 Manual

7-18
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–+ELECIGNITION SYSTEM
2. Measure:
Pulser coil output peak voltage
Below specification →
 Replace the
pulser coil. 
NOTE:
To crank the engine, connect the engine shut-
off cord (lanyard), and then press the start
switch and engine stop switch simultaneously.
3. Measure:
Lighting coil output peak voltage
Below specification →
 Replace the light-
ing coil.
NOTE:
To crank the engine, connect the engine shut-
off cord (lanyard), and then press the start
switch and engine stop switch simultaneously....

7-19
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–+ELEC
4. Measure:
Rectifier/regulator output voltage
Below specification →
 Replace the recti-
fier/regulator.
NOTE:
Before measuring the output peak voltage,
make sure that the battery is fully charged.
The output voltage gradually increases after
the engine is started, therefore, maintain the
specified engine speed for approximately 1
minute to measure the output voltage.
BATTERY
Refer to “ELECTRICAL” in Chapter 3.
FUSE
Refer to “STARTING SYSTEM”.
SPARK PLUGS
Refer to “POWER UNIT” in Chapter...

7-20
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–+ELEC
IGNITION COIL
1. Measure:
Primary coil resistance
Out of specification →
 Replace.
NOTE:
When measuring a resistance of 10 Ω
 or less
with the digital tester, the correct measurement
cannot be obtained because of the tester’s
internal resistance. 
Refer to “Low resistance measurement”.
Primary coil resistance:
Black/white (B/W) – Red (R)
1.53–2.07 
Ω at 20 °C (68 °F)
2. Measure:
Secondary coil resistance
Out of specification →
 Replace.
Secondary coil resistance:
12.5–16.9 k
Ω at 20 °C...

7-21
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–+ELECIGNITION SYSTEM
ENGINE TEMPERATURE SENSOR
1. Measure:
Engine temperature sensor resistance
(at the specified temperature)
Out of specification →
 Replace. 
Engine temperature sensor 
resistance:
20 °C (68 °F): 54.2–69.0 k
Ω 
100 °C (212 °F): 3.12–3.48 k
Ω 
Measurement steps:
Suspend the engine temperature sensor
in a container filled with water.
Slowly heat the water.
Measure the resistance when the speci-
fied temperature is reached.
INTAKE AIR TEMPERATURE SENSOR
1. Measure:
Intake air...

7-22
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–+ELECIGNITION SYSTEM
THERMOSWITCH (ENGINE)
1. Check:
Thermoswitch (engine) continuity
(at the specified temperature)
Out of specification →
 Replace. 
1 No continuity
È Temperature
2 Continuity
É Time
THERMOSWITCH (EXHAUST)
1. Check:
Thermoswitch (exhaust) continuity
(at the specified temperature)
Out of specification →
 Replace. 
1 No continuity
È Temperature
2 Continuity
É Time
Thermoswitch (engine) continuity 
temperature:
a 84–90 °C (183–194 °F)
b 70–84 °C (158–183 °F)
Checking steps:...

7-23
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–+ELECIGNITION SYSTEM
MAIN AND FUEL PUMP RELAY
1. Check:
Main and fuel pump relay continuity
Faulty →
 Replace. 
Checking steps:
Connect the tester leads between the
main and fuel pump relay terminals 5
, 6
and 7
.
Connect the terminals 2
 or 3
 to the pos-
itive battery terminal.
Connect the terminal 1
 to the negative
battery terminal.
Check that there is continuity between
the main and fuel pump relay terminals.
Check that there is no continuity between
the main and fuel pump relay...

7-24
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–+ELECIGNITION SYSTEM
THROTTLE POSITION SENSOR
1. Measure:
Throttle position sensor output voltage
Out of specification →
 Adjust the throttle
bodies synchronization.
Refer to “FUEL INJECTION SYSTEM”
in Chapter 4.
Test harness (3 pins):
YB-06793/90890-06793
Test connector:
YW-06862/90890-06862
Throttle position sensor output 
voltage:
Pink (P) – Black/Orange (B/O)
0.760 
± 0.016 V
Measurement steps:
Connect the test harness (3 pins) to the
throttle position sensor 1
.
To start the ECM normally,...

7-25
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–+ELECIGNITION SYSTEM
CAM POSITION SENSOR
1. Measure:
Cam position sensor output voltage
Out of specification →
 Replace.
NOTE:
When operating the Yamaha Diagnostic Sys-
tem, electric power is supplied to the cam posi-
tion sensor.
Test harness (3 pins):
YB-06777/90890-06777
Cam position sensor output 
voltage:
Green/orange (G/O) – 
Black/orange (B/O)
Position Voltage (V)
A More than 0.8
B Less than 4.8
Measurement steps:
Remove the cam position sensor.
Connect the test harness (3 pins) to the...

7-26
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–+ELECIGNITION SYSTEM
INTAKE AIR PRESSURE SENSOR
1. Measure:
Intake air pressure sensor output volt-
age
Out of specification →
 Replace.
È: Output voltage
É: Vacuum pressure 
NOTE:
When operating the Yamaha Diagnostic Sys-
tem, electric power is supplied to the intake air
pressure sensor.
Test harness (3 pins):
YB-06769/90890-06769
Vacuum/pressure pump gauge 
set:
YB-35956-A/90890-06756
Intake air pressure sensor output 
voltage:
Pink/green (P/G) – 
Black/orange (B/O)
1101.3 kPa 
(1.01 kgf/cm
2,...

7-27
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–+ELECIGNITION SYSTEM
SLANT DETECTION SWITCH
1. Check:
Slant detection switch continuity
Out of specification →
 Replace.
PositionLead color
Blue/black 
(L/B)Black/
orange 
(B/O)
Normal 
operation 
È 
Overturned 
É 
UP
UP
È
É