Yamaha WaveRunner VXR VX1800A, Service Manual

Page: 236 / 318

7-29
Fuel system
Fuel system
Fuel injector check
1. Connect the YDIS.
2. Using the “Stationary test” of the YDIS, lis-
ten for the fuel injector operation sound.
3. Disconnect the fuel injector couplers “a”.
4. Supply power to the ECM, and then mea-
sure the input voltage between the fuel in-
jector coupler terminals (wire harness end)
and ground. Check the wire harness if out
of specification.
5. Remove the fuel injectors. See “ETV and
fuel injector” (4-6).
6. Measure the fuel injector resistance.
7. Replace the fuel injector if out of specifica-
tion.
8. Install the fuel injectors. See “ETV and fuel
injector” (4-6).
Fuel pump relay check
1. Remove the fuse box cover and fuel pump
relay “1”.
2. Check the fuel pump relay. See “Main re-
lay check” (7-31).
3. Measure the input voltage between the ter-
minal “a” and ground.
4. Supply power to the ECM, and then mea-
sure the input voltage between the termi-
nals “a” and “b”.
Input voltage
12 V (battery voltage)
Red/Yellow (R/Y)–Ground
Resistance
11.5–12.5
Ω
a
R/Y
Input voltage
12 V (battery voltage)
Terminal “a”–Ground
Input voltage
12 V (battery voltage)
Terminal “a”–Terminal “b”
1
a
a
b