Yamaha Fz6 N Service Manual

							
ELECTRICAL COMPONENTS
8-118
Headlight relay
Radiator fan motor
EAS4S81030
CHECKING THE ABS MOTOR RELAY
1. Check: ABS motor relay for continuity Connect the pocket tester ( Ω ×  1) to the ter-
minals of ABS motor relay.
Check for continuity between terminals “1” 
and “2” of the ABS motor relay. Tester reading is “
∞”.  →  Replace the ABS 
motor relay.
CAUTION:
ECA4S81021
Do not reverse the connections. If the 
pocket tester leads are connected in 
reverse to terminals “1” and “2”, a correct 
pocket tester reading cannot be obtained.
 Connect the positive battery terminal to ter- minal “2” and the negative battery terminal 
to terminal “1”, and then check for continu-
ity between terminals “3” and “4” of the 
ABS motor relay.
Tester reading is “ ∞”.  →  Replace the ABS 
motor relay.
CAUTION:
ECA4S81022
 Be sure to connect the pocket tester posi- tive and negative probes correctly. If the 
pocket tester probes are connected in 
reverse, the diode of the ABS motor relay 
will be broken.
 When connecting the ABS motor relay 
and battery terminals, be careful not to 
short-circuit the positive and negative 
battery terminals.
1. Positive battery terminal
2. Negative battery terminal
3. Positive tester probe
4. Negative tester probe
Result Continuity/No continuity 
(between “3” to “4”)
1. Positive battery terminal
2. Negative battery terminal
3. Positive tester probe
4. Negative tester probe
ResultContinuity/No continuity 
(between “3” to “4”)
ABS motor relay resistance
50–150  Ω
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
 Tester positive probe  →Terminal “2”
 Tester negative probe  → Te r m i n a l  “ 1 ”
 Tester positive probe  →Terminal “3”
 Tester negative probe  → Te r m i n a l  “ 4 ” 
						

							
ELECTRICAL COMPONENTS
8-119
EAS4S81031
CHECKING THE SOLENOID VALVES AND 
MOTOR
CAUTION:
ECA4S81023
When check the hydraulic unit solenoid 
relay and ABS motor, do not remove the 
brake hoses.
1. Check: Solenoid valve resistance (front)
Out of specification  → Replace the hydrau-
lic unit.
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a. Connect the pocket tester ( Ω ×  1) to the 
solenoid valve (front) terminal as shown.
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2. Check:  Solenoid valve resistance (rear)
Out of specification  → Replace the hydrau-
lic unit.
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a. Connect the pocket tester ( Ω ×  1) to the 
solenoid valve (rear) terminal as shown.
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3. Check:  ABS motor continuity No continuity  → Replace the hydraulic unit.
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a. Connect the pocket tester ( Ω ×  1) to the 
ABS motor coupler terminal as shown.
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Solenoid valve resistance
2.96–3.20  Ω at 20 °C (68 °F)
Pocket tester
90890-03112
Analog pocket tester YU-03112-C
 Positive tester probe  →
terminal “1”
 Negative tester probe  →
terminal “2”
Solenoid valve resistance 2.96–3.20  Ω at 20 °C (68 °F)
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
 Positive tester probe  →
terminal “3”
 Negative tester probe  →
terminal “4”
There is continuity.
Pocket tester
90890-03112
Analog pocket tester YU-03112-C
 Positive tester probe  →
terminal “1”
 Negative tester probe  →
terminal “2” 
						

							
ELECTRICAL COMPONENTS
8-120
EAS4S81032
CHECKING THE TURN SIGNAL/HAZARD 
RELAY
1. Check: Turn signal/hazard relay input voltage Out of specification  → The wiring circuit 
from the main switch to the turn signal/haz-
ard relay coupler is faulty and must be 
repaired.
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a. Connect the pocket tester (DC 20 V) to the  turn signal/hazard relay terminal as shown.
b. Turn the main switch to “ON”.
c. Measure the turn signal/hazard relay input  voltage.
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2. Check: Turn signal/hazard relay output voltage Out of specification  → Replace.
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a. Connect the pocket tester (DC 20 V) to the 
turn signal/hazard relay terminal as shown. b. Turn the main switch to “ON”.
c. Measure the turn signal/hazard relay out-
put voltage.
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EAS28050
CHECKING THE RELAY UNIT (DIODE)
1. Check: Relay unit (diode) Out of specification  → Replace.
Turn signal/hazard relay input
voltage
DC 12 V
Pocket tester90890-03112
Analog pocket tester YU-03112-C
 Positive tester probe  →
Brown/Green “1”
 Negative tester probe  →
Ground
Turn signal/hazard relay output
voltage DC 12 V
Pocket tester90890-03112
Analog pocket tester
YU-03112-C
 Positive tester probe  →
Brown/White “1”
 Negative tester probe  →
Ground
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C 
						

							
ELECTRICAL COMPONENTS
8-121
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a. Disconnect the relay unit coupler from the wire harness.
b. Connect the pocket tester ( Ω ×  1) to the 
relay unit terminal as shown.
c. Check the relay unit (diode) for continuity.
d. Check the relay unit (diode) for no continu-
ity.
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EAS28070
CHECKING THE SPARK PLUG CAPS
The following procedure applies to all of the 
spark plug caps.
1. Check: Spark plug cap resistance Out of specification  → Replace.
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a. Remove the spark plug cap from the spark 
plug lead.
b. Connect the pocket tester ( Ω ×  1k) to the 
spark plug cap as shown.
c. Measure the spark plug cap resistance.
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EAS28100
CHECKING THE IGNITION COILS
The following procedure applies to all of the 
ignition coils.
1. Check:  Primary coil resistance Out of specification  → Replace.
Continuity
Positive tester probe  → Sky
blue “1”
Negative tester probe  →
Black/Yellow “2”
No continuity
Positive tester probe  → Black/
Yellow “2”
Negative tester probe  → Sky
blue “1”
Continuity Positive tester probe  → Sky
blue “1”
Negative tester probe  →
Black/Red “3”
No continuity Positive tester probe  → Black/
Red “3”
Negative tester probe  → Sky
blue “1”
Continuity
Positive tester probe  → Sky
blue “1”
Negative tester probe  → Light
green “4”
No continuity Positive tester probe  → Light
green “4”
Negative tester probe  → Sky
blue “1”
Continuity
Positive tester probe  → Blue/
Green “5”
Negative tester probe  →
Black/Red “3”
No continuity Positive tester probe  → Black/
Red “3”
Negative tester probe  → Blue/
Green “5”
Resistance
10.0 k Ω
Pocket tester
90890-03112
Analog pocket tester YU-03112-C
Primary coil resistance1.53–2.07  Ω at 20 °C (68 °F) 
						

							
ELECTRICAL COMPONENTS
8-122
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a. Disconnect the ignition coil connectors 
from the ignition coil terminals.
b. Connect the pocket tester ( Ω ×  1) to the 
ignition coil as shown.
c. Measure the primary coil resistance.
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2. Check:  Secondary coil resistance Out of specification  → Replace.
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a. Disconnect the spark  plug cap from the 
ignition coil.
b. Connect the pocket tester ( Ω ×  1k) to the 
ignition coil as shown. c. Measure the secondary coil resistance.
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3. Check:
 Ignition spark gap Out of specification  → Replace.
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a. Disconnect the spark plug cap from the 
spark plug.
b. Connect the ignition checker/dynamic  spark tester “1” as shown.
c. Set the main switch to “ON”.
d. Measure the ignition spark gap “a”.
e. Crank the engine by pushing the starter  switch and gradually increase the spark 
gap until a misfire occurs.
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EAS28120
CHECKING THE CRANKSHAFT POSITION 
SENSOR
1. Disconnect:
 Crankshaft position sensor coupler (from the wire harness)
Pocket tester
90890-03112
Analog pocket tester YU-03112-C
 Positive tester probe Red/black
 Negative tester probe Orange/Black (Gray/Black)
Secondary coil resistance 12.0–18.0 k Ω at 20 °C (68 °F)
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
 Negative tester probe Spark plug lead “1”
 Positive tester probe Spark plug lead “2”
Minimum ignition spark gap
6.0 mm (0.24 in)
Ignition checker90890-06754
Opama pet-4000 spark checker YM-34487
2. Spark plug cap 
						

							
ELECTRICAL COMPONENTS
8-123
2. Check: Crankshaft position sensor resistance
Out of specification  → Replace the crank-
shaft position sensor.
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a. Connect the pocket tester ( Ω ×  100) to the 
crankshaft position sensor coupler as 
shown.
b. Measure the crankshaft position sensor  resistance.
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EAS28130
CHECKING THE LEAN ANGLE SENSOR
1. Remove: Lean angle sensor
(from the bracket.)
2. Check:  Lean angle sensor output voltage
Out of specification  → Replace.
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a. Connect the lean angle sensor coupler to 
the wire harness.
b. Connect the pocket tester (DC 20 V) to the 
lean angle sensor coupler as shown. c. When turn the lean angle sensor to 65
°.
d. Measure the lean angle sensor out put volt-
age.
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EAS4S81036
CHECKING THE WHEEL SENSOR
1. Check: Front wheel sensor output voltage
Out of specification  → Replace
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a. Connect the pocket tester (DC20 V) to the 
front wheel sensor coupler as shown.
Crankshaft position sensor248–372  Ω at 20 °C (68 °F)
Pocket tester
90890-03112
Analog pocket tester YU-03112-C
 Positive tester probe Gray “1”
 Negative tester probe Black “2”
Lean angle sensor output volt-
age 65 °: 1.0–4.0 V
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
 Positive tester probe Yellow/Green “1”
 Negative tester probe Black/Blue “2”
Output voltage reading cycle
Hi: 1.1 V–1.7 V 
Lo: 0.5 V–0.9V
Pocket tester90890-03112
Analog pocket tester YU-03112-C
 Positive tester probe Black “1”
 Negative tester probe
Blue “2” 
						

							
ELECTRICAL COMPONENTS
8-124
b. Turn the main switch to “ON”.
c. Elevate the front wheel and slowly rotate it.
d. Measure the voltage with each full rotation of the front wheel, the voltage reading 
should cycle from Lo (0.5–0.9 V) to Hi (1.1–
1.7 V) to Lo to Hi.
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EAS4S81035
CHECKING THE STARTOR MOTOR OPERA-
TION
1. Check: Starter motor operation
Does not operate  → Perform the electric 
starting system troubleshooting, starting 
with step 5.
Refer to TROUBLESHOOTING on page 
9-1.
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a. Connect the positive battery terminal “1”  and starter motor lead “2” with a jumper 
lead “3”.
WARNING
EWA13810
 A wire that is used as a jumper lead must have at least the same capacity of the bat-
tery, otherwise the jumper lead may burn.
 This check is likely to produce sparks,  therefore, make sure no flammable gas or 
fluid is in the vicinity.
b. Check the starter motor operation.
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2. Check:  Stator coil resistance Out of specification 
→ Replace the stator 
coil.
EAS28150
CHECKING THE STATOR COIL
1. Disconnect:  Stator coil coupler
(from the wire harness)
2. Check:  Stator coil resistance
Out of specification  → Replace the stator 
coil.
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a. Connect the pocket tester ( Ω ×  1) to the 
stator coil coupler as shown.
b. Measure the stator coil resistance.
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EAS28170
CHECKING THE RECTIFIER/REGULATOR
1. Check:  Charging voltage
Stator coil resistance 0.22–0.34  Ω at 20 °C (68 °F)
Pocket tester
90890-03112
Analog pocket tester YU-03112-C
 Positive tester probe White “1”
 Negative tester probe White “2”
 Positive tester probe White “1”
 Negative tester probe White “3”
 Positive tester probe White “2”
 Negative tester probe White “3” 
						

							
ELECTRICAL COMPONENTS
8-125
Out of specification → Replace the rectifier/
regulator.
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a. Set the engine tachometer to the ignition 
coil of cylinder #1.
b. Connect the pocket tester (AC 20 V) to the 
rectifier/regulator coupler as shown.
c. Start the engine and let it run at approxi- mately 5000 r/min.
d. Measure the rectifier/regulator input volt-
age.
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EAS28180
CHECKING THE HORN
1. Check: Horn resistance Out of specification  → Replace.
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a. Disconnect the horn leads from the horn 
terminals.
b. Connect the pocket tester ( Ω ×  1) to the 
horn terminals. c. Measure the horn resistance.
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2. Check:
 Horn sound Faulty sound  → Adjust or replace.
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a. Connect a battery (12 V) to the horn.
b. Turn the adjusting screw in direction “a” or 
“b” until the specified horn sound is 
obtained.
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EAS28190
CHECKING THE ENGINE OIL LEVEL 
GAUGE
1. Drain: Engine oil
2. Remove:  Engine oil level gauge (from the oil pan)
3. Check:  Engine oil level gauge resistance
Charging voltage above 14 V at 5000 r/min
Pocket tester90890-03112
Analog pocket tester
YU-03112-C
 Positive tester probe Red “1”
 Negative tester probe Black “2”
Horn resistance 1.01–1.11  Ω at 20 °C (68 °F)
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
 Positive tester probe Horn terminal “1”
 Negative tester probe Horn terminal “2” 
						

							
ELECTRICAL COMPONENTS
8-126
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a. Connect the pocket tester (Ω ×  100) to the 
engine oil level gauge terminal as shown.
b. Measure the pickup coil resistance.
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EAS28230
CHECKING THE FUEL SENDER
1. Remove:  Fuel tank
2. Disconnect:
 Fuel pump coupler
 Fuel sender coupler (from the wire harness)
3. Remove:  Fuel pump (from the fuel tank)
4. Check:
 Fuel sender resistance Out of specification  → Replace the fuel 
pump assembly.
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a. Connect the pocket tester ( Ω ×  10) to the 
fuel sender terminal as shown.
b. Measure the fuel sender resistance.
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EAS28240
CHECKING THE SPEED SENSOR
(except for ABS)
1. Check:  Speed sensor output voltage
Out of specification  → Replace.
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a. Connect the pocket tester (DC 20 V) to the 
speed sensor coupler (wire harness side) 
as shown.
Engine oil level gauge
Maximum level position resis-
tance114–126  Ω at 20 °C (68 °F)
Minimum level position resis-
tance 484–536  Ω at 20 °C (68 °F)
Pocket tester
90890-03112
Analog pocket tester YU-03112-C
Maximum level position “A”
 Positive tester probe Connector (white) “1”
 Negative tester probe Body earth “2”
Minimum level position “B”
 Positive tester probe Connector (white) “1”
 Negative tester probe Body earth “3”
Fuel sender resistance (full)
20–26  Ω at 20 °C (68 °F)
Fuel sender resistance (empty) 134–140  Ω at 20 °C (68 °F)
Pocket tester
90890-03112
Analog pocket tester YU-03112-C
 Positive tester probe Green/White “1”
 Negative tester probe
Black “2”
Output voltage reading cycle 0.6 V–4.8 V–0.6 V–4.8 V
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C 
						

							
ELECTRICAL COMPONENTS
8-127
b. Set the main switch to “ON”.
c. Elevate the rear wheel and slowly rotate it.
d. Measure the voltage (DC 5 V) of White/Yel-low and Black/Blue. With each full rotation 
of the rear wheel, the voltage reading 
should cycle from 0.6 V to 4.8 V to 0.6 V to 
4.8 V.
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EAS28250
CHECKING THE RADIATOR FAN MOTOR
1. Check: Radiator fan motor
Faulty/rough movement  → Replace.
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a. Disconnect the radiator fan motor coupler 
from the wire harness.
b. Connect the battery (DC 12 V) as shown.
c. Measure the radiator fan motor movement.
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EAS28260
CHECKING THE COOLANT TEMPERATURE 
SENSOR
1. Remove:  Coolant temperature sensor
WARNING
EWA14130
 Handle the coolant temperature sensor with special care.
 Never subject the coolant temperature 
sensor to strong shocks. If the coolant 
temperature sensor is dropped, replace it.
2. Check:  Coolant temperature sensor resistance Out of specification  → Replace.
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a. Connect the pocket tester ( Ω ×  100) to the 
coolant temperature sensor “1” as shown.
b. Immerse the coolant temperature sensor in  a container filled with coolant “2”.
NOTE:
Make sure the coolant temperature sensor ter-
minals do not get wet.
c. Place a thermometer “3” in the coolant.
d. Slowly heat the coolant, and then let it cool to the specified temperature indicated in 
the table.
 Positive tester probe
White/Yellow “1”
 Negative tester probe
Black/Blue “2”
 Positive tester probe Blue “1”
 Negative tester probe
Black “2”
Coolant temperature sensor 5.21–6.37 k Ω at 0 °C (32 °F) 
0.29–0.35 k Ω at 80 °C (176 °F)
Pocket tester
90890-03112
Analog pocket tester YU-03112-C