2005 YAMAHA VX110 check engine

7-18
E
–+ELEC
IGNITION COIL
1. Measure:
Primary coil resistance
Out of specification →
Replace.
NOTE:
When measuring a resistance of 10 Ω
or less
using a digital tester, the correct measurement
cannot be obtained because of the tester’s
internal resistance.
Refer to “Low resistance measurement”.
Primary coil resistance:
1.19–1.61
Ω at 20 °C (68 °F)
2. Measure:
Secondary coil resistance
Out of specification →
Replace.
Secondary coil resistance:
8.5–11.5 k
Ω at 20 °C (68 °F)
ENGINE STOP SWITCH
1. Check:
Engine stop switch continuity
Out of specification →
Replace.
Engine stop switch continuity
(black coupler)
Clip PositionLead color
White Black
InstalledFree
Push
RemovedFree
Push
IGNITION SYSTEM
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7-19
E
–+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.
Place a thermometer in the water.
Slowly heat the water.
Measure the resistance when the speci-
fied temperature is reached.
SENSOR ASSEMBLY
1. Check:
Intake air temperature sensor
Out of specification →
Replace the sen-
sor assembly.
Checking steps:
Measure the ambient temperature.
Connect a computer to the watercraft and
use the Yamaha Diagnostic System to
display the intake air temperature.
If the ambient temperature and the dis-
played intake air temperature differ by
more than ±
5 °C (±
9 °F), replace the
sensor assembly.
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7-20
E
–+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
NOTE:
The thermoswitch (engine) connector is blue.
Thermoswitch (engine) continuity
temperature:
a 84–90 °C (183–194 °F)
b 70–84 °C (158–183 °F)
Checking steps:
Suspend the thermoswitch (engine) in a
container filled with water.
Place a thermometer in the water.
Slowly heat the water.
Measure the continuity when the speci-
fied temperature is reached.
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7-47
E
–+ELECOFF THROTTLE STEERING SYSTEM
STEERING SENSOR
1. Check:
Steering sensor
Malfunction → Replace the steering
sensor.
Checking steps:
Turn the handlebar all the way to the left
or right, and then release it.
Install a plastic tie 1 loosely around the
center of the handlebar grip as shown.
Hook a spring gauge 2 onto the plastic
tie.
Hold the spring gauge at a 90° angle
from the handlebar, and then pull the
spring gauge with a force of 10 kgf
(22 lb).
When handlebar
pulledWhen handlebar
not pulled
ON OFF
Check that the following is displayed in
the “Engine Monitor” window of the
Yamaha Diagnostic System.
Use the same procedure to check that
the steering sensor operates correctly
when the handlebar is turned to both the
left and right. Replace the steering sen-
sor if it is a malfunction.
1
2
ECM
Refer to “IGNITION SYSTEM”.
PICKUP COIL
Refer to “IGNITION SYSTEM”.
THROTTLE POSITION SENSOR
Refer to “IGNITION SYSTEM”.
ACCELERATOR POSITION SENSOR
Refer to “IGNITION SYSTEM”.
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7-50
E
–+ELECINDICATION SYSTEM
FUSE
Refer to “STARTING SYSTEM”.
BATTERY
Refer to “ELECTRICAL” in Chapter 3.
MAIN AND FUEL PUMP RELAY
Refer to “IGNITION SYSTEM”.
ECM
Refer to “IGNITION SYSTEM”.
ENGINE TEMPERATURE SENSOR
Refer to “IGNITION SYSTEM”.
THERMOSWITCH (ENGINE)
Refer to “IGNITION SYSTEM”.
THERMOSWITCH (EXHAUST)
Refer to “IGNITION SYSTEM”.
REMOTE CONTROL UNIT
(DELUXE MODEL ONLY)
Refer to “REMOTE CONTROL SYS-
TEM (DELUXE MODEL ONLY)”.
BUZZER
1. Check:
Buzzer
Buzzer does not sound → Replace.
Checking steps:
Connect the battery (12 V) to the buzzer
coupler as shown.
Battery positive terminal →
Red (R) terminal 1
Battery negative terminal →
Black (B) terminal 2
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7-51
E
–+ELECINDICATION SYSTEM
OIL PRESSURE SWITCH
1. Measure:
Oil pressure switch continuity
Out of specification → Replace.
Lower unit pressure/vacuum
tester:
YB-35956-A
Vacuum/pressure pump gauge
set:
90890-06756
Oil pressure switch continuity
pressure:
128 kPa (1.28 kgf/cm
2, 18.6 psi) –
167 kPa (1.67 kgf/cm2, 24.2 psi)
MULTIFUNCTION METER
Multifunction meter
1. Check:
Multifunction meter
Cracked meter housing → Replace the
multifunction meter.
Meter is fogged/shows signs of water
intrusion → Replace the multifunction
meter.
MULTIFUNCTION METER REMOVAL
Refer to “ENGINE HATCH COVER” in
Chapter 8.
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7-55
E
–+ELECINDICATION SYSTEM
Tachometer display
1. Check:
Tachometer display
Does not display → Check the engine
speed using the “Engine monitor” of the
Yamaha Diagnostic System.
Replace the multifunction meter.
Hour meter display
1. Check:
Hour meter display
Does not display → Replace the multi-
function meter.
Voltage meter display
1. Check:
Voltage meter display
Does not display → Check the battery
voltage using the “Engine monitor” of
the Yamaha Diagnostic System.
Replace the multifunction meter.
Low oil pressure warning indicator
1. Check:
Low oil pressure warning indicator
Does not come on → Check the oil pres-
sure switch using the “Engine monitor”
of the Yamaha Diagnostic System.
Replace the multifunction meter.
Fuel level meter display and fuel warning
indicator
1. Check:
Fuel level meter display and fuel warn-
ing indicator
Do not display → Measure the fuel
sender resistance.
If the fuel sender resistance is within
specification, replace the multifunction
meter.
2. Measure:
Fuel sender resistance
Refer to “FUEL CONTROL SYSTEM”.
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7-56
E
–+ELECINDICATION SYSTEM
Overheat warning indicator
1. Check:
Overheat warning indicator
Does not come on → Replace the multi-
function meter.
Checking steps:
Start the engine.
Disconnect the thermoswitch (engine)
connector 1 (blue), engine temperature
sensor connector 2 (black), or ther-
moswitch (exhaust) 3 connector.
Connect the jumper lead to the female
terminal of the disconnected connector.
Check that the multifunction meter over-
heat warning indicator blinks, then comes
on. The buzzer also begins to sound
intermittently, then sounds continuously.
3
12
Check engine warning indicator
1. Check:
Check engine warning indicator
Does not come on → Replace the multi-
function meter.
Checking steps:
Start the engine.
Disconnect the coupler of a sensor (e.g.,
engine temperature sensor) that normally
activates the check engine warning indi-
cator when a malfunction occurs.
Check that the warning light and check
engine warning indicator begin to blink
and the buzzer sounds intermittently.
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