Yamaha WaveRunner VXR VX1800A, Service Manual

Page: 222 / 318

7-15
Control system
Control system
Oil pressure switch check
1. Disconnect the oil pressure switch coupler
“a”.
2. Supply power to the ECM, and then mea-
sure the input voltage between the oil
pressure switch coupler terminal (wire har-
ness end) and ground. Check the wire har-
ness if out of specification.
3. Remove the oil pressure switch. See “Oil
separator tank and oil pan” (5-69).
4. Connect the tester leads to the terminal
threads “a” and body “b” of the oil pressure
switch.
5. Connect the special service tool “1” to the
oil pressure switch, and then apply positive
pressure.
6. Check the oil pressure switch for continui-
ty. Replace if out of specification.
7. Install the oil pressure switch. See “Oil
separator tank and oil pan” (5-69).
8. Connect the oil pressure switch coupler.
Thermo switch check
1. Disconnect the thermo switch coupler “a”.
2. Supply power to the ECM, and then mea-
sure the input voltage at the thermo switch
coupler terminals (wire harness end).
Check the wire harness if out of specifica-
tion.
3. Remove the thermo switch. See “Cylinder
block and electrical part” (5-67).
4. Suspend the thermo switch in a container
filled with water, and then heat the water
slowly.
Input voltage
11–12 V
Pink/White (P/W)–Ground
Vacuum/pressure pump gauge set “1”
90890-06945
Pressure/vacuum tester “1”
YB-35956-B
P/W
a
b
a
1
Oil pressure switch continuity
Pressure
Terminal thread “a”–
Body “b”
Below 128–166 kPa
(1.3–1.7 kgf/cm²,
18.6–24.1 psi)
Continuity
Above 128–166 kPa
(1.3–1.7 kgf/cm²,
18.6–24.1 psi)
No continuity
Input voltage
11–12 V
Pink (P)–Black (B)
P B
a