Yamaha MX-800, Service Manual, Page: 140 / 188

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ELECTRICAL
ELECTRICAL COMPONENTS
3.
Connect:
• Digital circuit tester
(between the engine ground and oil pressure switch
terminal)
4.
Check:
• Oil pressure switch continuity
No continuity

Replace the oil pressure switch.
CHECKING MANIFOLD ABSOLUTE PRESSURE
SENSOR
1.
Connect:
• FI Diagnostic Tool “1”
2.
Select Mode:
• Select “DIAG” Mode and “MAP” Diag Code.
3.
Check:
• Compare “MAP” value with atomosphere pressure
Does not much

Replace the manifold absolute.
CHECKING THE THROTTLE POSITION SENSOR
1.
Remove:
• Throttle body assembly
(Refer to “THROTTLE BODY ASSEMBLY” on page
4-6)
2.
Check:
• Throttle position sensor maximum resistance
Out of specification

Replace the throttle position
sensor.
Model 88 Multimeter with tachometer:
YU-A1927
1
FI Diagnostic Tool:
90890-03253
Atomosphere pressure (Reference):
14–15 Psi
• Handle the throttle body assembly with special care.
• Never subject the throttle body assembly to strong
shocks. If the throttle body assembly is dropped,
replace it.
NOTICE