Pickup Coil Resistance Test; Pressure Sensor - Yamaha VMX12H Supplementary Service Manual

IGNITION SYSTEM
I
I
7-29

PICKUP COIL RESISTANCE TEST

1. Remove:
2.
Disconnect:
connecter (Black,
and Gray)
3. Measure
coil resistance
Use a Pocket Tester
Out of specification
Pickup Coil Resistance:
10% at 20°C
1
-
Black
Orange
Gray
SPARK PLUG INSPECTION
Refer to "CHAPTER
S PE CT N section.
"

PRESSURE SENSOR

Operation
This pressure sensor unit consists of a semi-
conductor strain gauge and an amplifying circuit.
Pressure to the carburetor joint (venturi portion)
is sensed by the strain gauge and amplified in
the circuit connected with this gauge. The
amplified pressure signals are then transmitted
to the ignition system for the control of ignition
timing advance.
Strain gauge
Amplifying circuit
Pressure intake tube
From carburetor joint
Orange,
Replace.
-
2
SPARK PLUG IN-