Yanmar 3TNV82A Troubleshooting Manual page 205

Method and Procedure of Failure Diagnosis
CAN Communication
Related DTC
DTC U0001/12
Work flow
*For details of the work, see after-mentioned "<Work Description>."For the operation of the
diagnosis tool, see "Diagnosis tool Operation Manual" separately.
Initial diagnosis with the diagnosis tool
A. Check the current
failure display.
Current failure
exists.
B. Check the detected
value to estimate the
cause of failure.
Failure diagnosis flow
1. Check of
battery voltage
(diagnosis tool)
OK
2. Check the harness
continuity.
OK
TNV DI Service Manual
CAN Communication Error
DTC in the failure history indication
[Check Items]: Battery voltage
• 12[V] or equivalent
≤
• 10.5[V]
NG
NG
FAILURE DIAGNOSIS
≤
battery voltage < 16[V]
→CAN wiring disconnected?
Battery voltage <12[V] or equivalent
→ Battery voltage descent?
Another ECU deactivated?
Charge or replace battery.
Replace the harness.
Check of other ECUs movement
or replacement of E-ECU
Check the failure
conditions.
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