Yanmar 3TNV82A Troubleshooting Manual page 202

FAILURE DIAGNOSIS
Wiring Diagram
: Check points
Battery
Fuse
15A
Key switch
"ON"
Fuse
5A
*For the E-ECU Pin Layout, see [E-ECU Pin Layout Diagram] (P.1-134).
1-200
Relay side coupler
(coupling face)
A
＋ −
Self-hold relay
Fuse
10A
B
Harness side coupler
(coupling face)
B10 B10 E48
E34 -- --
Method and Procedure of Failure Diagnosis
C
B
D
ECU
C
A
D
E48
E34
E07
TNV DI Service Manual
E-ECU
VB VB
MAIN-RLY
IGNSW
017559-00E