Yamaha Waverunner 3 Manual

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–+ELECELECTRICAL BOX AND IGNITION COIL BOX
EXPLODED DIAGRAM 
REMOVAL AND INSTALLATION CHART
Step Procedure/Part name Q’ty Service points
IGNITION COIL BOX REMOVAL
Follow the left “Step” for removal.
Air filter Refer to “FUEL INJECTION SYSTEM” in 
Chapter 4.
1 Spark plug cap 4
2 Holder 1
3 Ignition coil coupler 2
4 Bolt/washer 3/3
5 Ignition coil box 1
6 Collar 3
Reverse the removal steps for installation.
6 × 28 mm
7.6 N • m (0.76 kgf 
• m, 5.5 ft 
• Ib)
1
4
5 3 26 
						

							7-9
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–+ELECELECTRICAL BOX AND IGNITION COIL BOX
EXPLODED DIAGRAM 
REMOVAL AND INSTALLATION CHART
Step Procedure/Part name Q’ty Service points
IGNITION COIL BOX 
DISASSEMBLYFollow the left “Step” for disassembly.
1 Tapping screw 10
2 Holder 2
3 Ignition coil cover 1
4 Tapping screw 4
5 Ignition coil 2
6 Hightention code 4
7 Ignition coil case 1
Reverse the disassembly steps for 
assembly.
7 65 65 4
4 3 2 112
4.9 N •
 m (0.49 kgf • m, 3.5 ft • Ib)
6 × 19 mm4.9 N •
 m (0.49 kgf • m, 3.5 ft • Ib)
6 × 24 mm 
						

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–+ELECELECTRICAL BOX AND IGNITION COIL BOX
UP
1
4
3
2
1
4
3
2
234
5
6
7
8 1
9ÊÉÈ
1Starter relay
2Fuse holder
3ECM
4Joint connector
5Joint connector
6Main and fuel pump relay
7Rectifier/regulator
8Slant detection switch
9Ignition coilÈTo ignition coil
ÉTo battery positive terminal
ÊTo starter motor 
						

							7-11
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–+ELECELECTRICAL ANALYSIS
ELECTRICAL ANALYSIS
INSPECTION
CAUTION:
All measuring instruments should be han-
dled with special care. Damaged or mis-
handled instruments will not measure
properly.
On an instrument powered by dry batter-
ies, check the battery’s voltage periodi-
cally and replace the batteries if
necessary.
Digital tester
NOTE:
Throughout this chapter the digital tester’s part
number has been omitted. Refer to the follow-
ing part number. 
NOTE:
“” indicates a continuity of electricity;
i.e., a closed circuit at the respective switch
position.
Digital circuit tester:
YU-34899-A/90890-03174 
						

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–+ELECELECTRICAL ANALYSIS
Low resistance measurement
NOTE:
When measuring a resistance of 10 Ω
 or less
with the digital tester, the correct measure-
ment cannot be obtained because of the
tester’s internal resistance. 
To obtain the correct value, subtract the
internal resistance from the displayed mea-
surement. 
The internal resistance of the tester can be
obtained by connecting both of its terminals.
Correct value =
Displayed measurement – 
Internal resistance
Peak voltage measurement
NOTE:
When checking the condition of the ignition
system it is vital to know the peak voltage.
Cranking speed is dependant on many fac-
tors (e.g., fouled or weak spark plugs, a
weak battery). If one of these is defective,
the peak voltage will be lower than specifica-
tion.
If the peak voltage measurement is not
within specification the engine will not oper-
ate properly.
A low peak voltage will also cause compo-
nents to prematurely wear. 
						

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–+ELECELECTRICAL ANALYSIS
Peak voltage adaptor
NOTE:
Throughout this chapter the peak voltage
adaptor’s part number has been omitted.
Refer to the following part number.
The peak voltage adaptor should be used
with the digital tester. 
When measuring the peak voltage, connect
the peak voltage adaptor to the digital circuit
tester and switch the selector to the DC volt-
age mode.
NOTE:
Make sure that the adaptor leads are prop-
erly installed in the digital circuit tester.
Make sure that the positive pin (the “+” mark
facing up as shown) on the adaptor is
installed into the positive terminal of the
tester.
The test harness is needed for the following
tests.
È Voltage measurement
É Peak voltage measurement
Peak voltage adaptor:
YU-39991/90890-03172
È
É
Test harness 
NOTE:
If the lighting coil and pulser coil(s) are mea-
sured unloaded, disconnect the test harness
on the output side coupler.Checking steps:
Disconnect the coupler connections.
Connect the test harness between the
couplers.
Connect the tester terminals to the termi-
nals which are being checked.
Run the engine and observe the mea-
surement. 
						

							7-14
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–+ELECIGNITION SYSTEM
IGNITION SYSTEM
WIRING DIAGRAM
FREE
PUSHW
B
FREE
PUSHBr
Br
FREE
PUSHWBRBr
P/W
P/W
P/W
K
R/YB/W
B/W
O
B/O
P/G
R
L/R
R/YR/Y
B/O
B/O
B/Y
B/O
B/O
B/O
B/O
B/WRB
B/OR/Y
L/RBrL
Y
R/YR/Y
B
G/O
G/O
R/Y
R/Y
B/YB/Y B/Y B/O
B/Y
B/O
B/O
B/O W/R
W/BW
B
R
B/O
B/Y
O  P
Y
P
RGGG
G
RBW
GG
B
P
R
W
Br
G
R
B
GG
GG
G OPu/R
Pu/GPu/B
B/O Pu/G Pu/B
Pu/R Bu/Y
B/YR/Y
B/YB/O
P/G
R/Y
Pu/Y
P
W
B/O
R
B
P
B/O
B
P
B/O
#2
#3
R/YB/R
B/W
R
B/WR
#1
#4
B/O
R 
R 
BrB
B
R 
B/O
B/OB/OB/O
W
Br
Br
B
R
R
PB
PB
A
C3
2
B 1
II
IID F J
JG
HEE8 56
7
9
0 4
R/Y
R/Y R/YR
P
P
O R
R
R R R P POO
B/OL/B
 2  : W
 3  : P/W
 4  : P 
 5  : B/Y
 6  : B/O
 7  : Y
 8  : O
 9  : W/R
10 : W/B
11 : L/R13 : B/R
15 : G/O
17 : L/B
18 : R/Y
19 : P/G
20 : P
21 : B/Y
27 : B
28 : B/W
1 2  3  4 5 6   7   8 
B
BB
B/O
Br
4321
8765
1ECM
2Main and fuel pump relay
3Fuse (20A)
4Battery
5Engine shut-off switch
6Engine stop switch
7Start switch
8Thermoswitch (exhaust)
9Thermoswitch (engine)0Engine temperature sensor
ASlant detection switch
BCam position sensor
CRectifier/regulator
DLighting coil
EPulser coil
FIntake air temperature sensor
GIntake air pressure sensor
HThrottle position sensorISpark plug
JIgnition coil
KOil pressure switch 
						

							7-15
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–+ELECIGNITION SYSTEM
WIRING DIAGRAM
FREE
PUSHW
B
FREE
PUSHBr
Br
FREE
PUSHWBRBr
P/W
P/W
P/W
K
R/YB/W
B/W
O
B/O
P/G
R
L/R
R/YR/Y
B/O
B/O
B/Y
B/O
B/O
B/O
B/O
B/WRB
B/OR/Y
L/RBrL
Y
R/YR/Y
B
G/O
G/O
R/Y
R/Y
B/YB/Y B/Y B/O
B/Y
B/O
B/O
B/O W/R
W/BW
B
R
B/O
B/Y
O  P
Y
P
RGGG
G
RBW
GG
B
P
R
W
Br
G
R
B
GG
GG
G OPu/R
Pu/GPu/B
B/O Pu/G Pu/B
Pu/R Bu/Y
B/YR/Y
B/YB/O
P/G
R/Y
Pu/Y
P
W
B/O
R
B
P
B/O
B
P
B/O
#2
#3
R/YB/R
B/W
R
B/WR
#1
#4
B/O
R 
R 
BrB
B
R 
B/O
B/OB/OB/O
W
Br
Br
B
R
R
PB
PB
A
C3
2
B 1
II
IID F J
JG
HEE8 56
7
9
0 4
R/Y
R/Y R/YR
P
P
O R
R
R R R P POO
B/OL/B
 2  : W
 3  : P/W
 4  : P 
 5  : B/Y
 6  : B/O
 7  : Y
 8  : O
 9  : W/R
10 : W/B
11 : L/R13 : B/R
15 : G/O
17 : L/B
18 : R/Y
19 : P/G
20 : P
21 : B/Y
27 : B
28 : B/W
1 2  3  4 5 6   7   8 
B
BB
B/O
Br
4321
8765
B: Black
Br : Brown
G: Green
L: Blue
O : Orange
P: Pink
R: Red
W: White
Y : YellowB/O : Black/orange
B/R : Black/red
B/W : Black/white
B/Y : Black/yellow
G/O : Green/orange
L/B : Blue/black
L/R : Blue/red
P/G : Pink/green
P/W : Pink/whiteR/Y : Red/yellow
W/B : White/black
W/R : White/red 
						

							7-16
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–+ELECIGNITION SYSTEM
IGNITION SPARK GAP
 WARNING
When checking the spark gap, do not
touch any of the connections of the spark
gap tester lead wires.
When performing the spark gap test, take
special care not to let sparks leak out of
the removed spark plug cap.
When performing the spark gap check,
keep flammable gas or liquids away,
since this test can produce sparks.
1. Check:
Ignition spark gap
Below specification →
 Check the ECM
output peak voltage.
Check the ignition coil for resistance.
ÈFor USA and Canada
ÉFor worldwide
Spark gap:
7–8 mm (0.28–0.31 in)
Checking steps:
Connect the spark plug cap to the spark
gap tester.
Set the spark gap length on the adjusting
knob.
Spark gap tester:
YM-34487/90890-06754
Crank the engine and observe the igni-
tion system spark through the discharge
window.
È
É
È
É 
						

							7-17
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–+ELECIGNITION SYSTEM
IGNITION SYSTEM PEAK VOLTAGE
 WARNING
When checking the electrical components,
do not touch any of the connections of the
digital tester lead wires.
NOTE:
If there is no spark, or the spark is weak,
continue with the ignition system test.
If a good spark is obtained, the problem is
not with the ignition system, but possibly with
the spark plug(-s) or another component.
1. Measure:
ECM output peak voltage
Below specification →
 Measure the
pulser coil output peak voltage.
Replace the ECM. 
NOTE:
B/R – Ground for cylinder #1 and #4.
B/W – Ground for cylinder #2 and #3.
To crank the engine, connect the engine shut-
off cord (lanyard), and then press the start
switch and engine stop switch simultaneously.
Test harness (2 pins):
YB-06792/90890-06792
ECM output peak voltage:
Black/red (B/R) – Ground
Black/white (B/W) – Ground
r/minLoaded
Cranking 2,000 3,500
V 7 258 258