Yamaha F400A 2022 - Checking the Electrical Management Box

Engine control unit and component
5-20
e. Turn the main switch or power switch
to OFF.
f. Connect the engine ECM couplers.
Checking the electrical management
box
1. Check:
• Electrical management box
a. Connect the YDIS and check that trou-
ble codes for code number 190 and
higher are not displayed.
Trouble codes for code number 190
and higher are displayed → See “Trou-
ble code and checking step” (4-8).
Trouble codes for code number 190
and higher are not displayed → Check
the engine ECM and electrical man-
agement box for continuity.
TIP:
To connect the YDIS, use the CAN-Line.
b. Disconnect the engine ECM couplers
“a”, “b”, and “c”.
c. Disconnect the electrical management
box coupler “d”.
d. Check the wire harness for continuity.
Continuity between the engine ECM
coupler “a” and the electrical manage-
ment box coupler “d”:
Continuity between the engine ECM
coupler “b” and the electrical manage-
ment box coupler “d”:
Input voltage
12 V
Terminal 36 of engine ECM cou-
pler “b”–Ground
36
b
<B>
a b c
Terminal of coupler
“a”
Terminal of coupler
“d”
8–13
7–6
17 – 12
26 – 21
d
8 7
67
22 21 20 1823
13 12 9 1516
3334
25 26
17
1
2
1117
26
2
a
c
b
d
<B>
<C>
<A>