Yamaha Waverunner 3 Manual

7-8
E
–+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
E
–+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 

7-10
E
–+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
E
–+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...

7-12
E
–+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...

7-13
E
–+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...

7-14
E
–+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...

7-15
E
–+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...

7-16
E
–+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...

7-17
E
–+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....