Checking The Oil Pressure Sensor; Checking The Valve Clearance - Yamaha F150A Service Manual

Checking the oil pressure sensor

1. Connect the test harness (3 pins) to the
oil pressure sensor.
2. Start the engine and warm it up for 5 min-
utes.
3. Measure the oil pressure sensor input
voltage. Check the wiring harness con-
nection or replace the ECM if out of spec-
ification.
4. Measure the oil pressure sensor output
voltage. Replace if out of specification.
2.8 V
a
b
a: Output voltage
b: Oil pressure
Test harness (3 pins):
New: 90890-06869
Current: 90890-06769
Oil pressure sensor input voltage:
Orange (O) – Black (B)
5 V
Oil pressure sensor output voltage
(reference data):
Pink/white (P/W) – Black (B)
2.8 V at engine idle speed
63P3F11
S63P5030
450 kpa
(4.5 kgf/cm 2 ,
S63P5040
65.3 psi)

Checking the valve clearance

1. Remove the flywheel magnet cover and
spark plug wire cover.
2. Disconnect the fuel hoses from the fuel
pumps.
3. Disconnect the spark plug wires 1, and
remove the blowby hoses 2, spark
plugs, and cylinder head cover 3.
2
3
4. Turn the flywheel magnet clockwise and
align the "TDC" mark a on the flywheel
magnet with the pointer b, and check
that "I" marks c and d on the driven
sprockets are aligned.
c
NOTE:
Do not turn the flywheel magnet counter-
clockwise.
Power unit
2
1
S63P5050
d
a
20
10
b
S63P5060
5-12
1
2
3
4
5
6
7
8
9