Yanmar 3TNV82A Troubleshooting Manual page 206

FAILURE DIAGNOSIS
Work Description
1. Battery voltage check:
• During the engine running, connect the diagnosis tool and log in to the diagnosis tool.
• Check the battery voltage with the diagnosis tool "Diagnosis Test: Pulse/analog etc.".
Voltage
Approx.12[V] ≤ battery voltage < 16[V]
10.5[V] ≤ battery voltage < approx.12[V]
NG
OK
2. Check of harness continuity:
• Check the harness continuity using a circuit tester.
Terminal
CAN wiring (Hi side) E40
(Between E-ECU and sensor connector)
CAN wiring (Low side) E39
(Between E-ECU and sensor connector)
Between E39/E40 and
GND/E28/E45/E47
NG
OK
1-204
• Charge or replace the battery.
• Check the movement of other E-ECUs.
Check the harness for correct continuity. → Go to [2. Check of harness continuity:]
• Check if the harness is damaged, or if the wiring is correct.
• Replace the harness.
• Check the movement of other E-ECUs.
• Replace the E-ECU.
Method and Procedure of Failure Diagnosis
Status
OK
Check the harness for correct continuity.
(normal range)
• Charge or replace the battery.
NG
• Check the movement of other E-ECUs.
Continuity
Available OK: normal
Unavailable NG: harness disconnection
Available OK: normal
Unavailable NG: harness disconnection
Unavailable OK: normal
Available NG: harness short-circuited with GND
TNV DI Service Manual
Action
Status