Yamaha WaveRunner VXR VX1800A, Service Manual

Page: 225 / 318

Control system
7-18
8. Measure the intake air temperature sensor
resistance when the specified tempera-
tures are reached. Replace if out of speci-
fication.
9. Install the intake air temperature sensor.
See “Intake manifold” (5-24).
10. Connect the intake air temperature sensor
coupler.
Intake air pressure sensor check
1. Disconnect the intake air pressure sensor
coupler “a”.
2. Supply power to the ECM, and then mea-
sure the input voltage at the intake air
pressure sensor coupler (wire harness
end). Check the wire harness if out of
specification.
3. Connect the intake air pressure sensor
coupler.
4. Disconnect the vacuum hose from the in-
take air pressure sensor.
5. Connect the special service tool “1” to the
intake air pressure sensor.
6. Connect the YDIS to display “Intake air
pressure”.
7. Apply negative pressure to the intake air
pressure sensor slowly and check that the
displayed intake air pressure increases.
Replace if it does not increase.
8. Disconnect the special service tool, and
then connect the vacuum hose.
TPS check
• Do not loosen the throttle stop screw nut
and do not turn the throttle stop screw.
• Do not disconnect the ETV coupler (throt-
tle body end).
• TPS 1 and TPS 2 are components of the
ETV, which cannot be disassembled.
Resistance at 0°C (32°F)
5.4–6.6 k
Ω
Resistance at 80°C (176°F)
0.29–0.39 k
Ω
Input voltage
4.75–5.25 V
Orange (O)–Black/Orange (B/O)
O B/O
a
Vacuum/pressure pump gauge set “1”
90890-06945
Pressure/vacuum tester “1”
YB-35956-B
1