Ecm Circuit - Yamaha WaveRunner FX SHO Service Manual

– +
ELEC
Control system
3 1 2
B
1
R/Y
1 2
B
B
B
2
3
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ECM circuit

1. Measure:
• ECM input voltage
Out of specification → Check the ECM
circuit.
Measurement steps:
1. Disconnect the ECM coupler 1.
2. Push the unlock button, and then measure
the input voltage between the ECM cou-
pler terminal (wiring harness end) and
ground.
NOTE:
Do not disconnect the coupler 2 or coupler 3
when measuring the ECM input voltage.
ECM input voltage:
Red/yellow (R/Y) – Ground
12 V (battery voltage)
2. Check:
• ECM circuit continuity
No continuity → Replace the wiring har-
ness assembly.
Checking steps:
1. Disconnect the ECM couplers 1 and 2.
2. Check the continuity between the ECM
coupler terminals 3 (wiring harness end)
and ground.
E
1
2
3
4
5
6
7
8
9