Yanmar 3TNV82A Troubleshooting Manual page 171

Method and Procedure of Failure Diagnosis
Work Description
1. Battery voltage check:
• Set the accelerator at the lowest position, and operate the engine.
• Measure the battery voltage using a circuit tester.
Battery voltage (in the normal condition)
• Check the alternator.
NG
• Replace the battery.
Check the harness for correct continuity. → Go to [2. Check of harness continuity:]
OK
2. Check of harness continuity:
• Remove the connector of the spare speed sensor and E-ECU from the harness.
• Check the harness continuity using a circuit tester.
Terminal
Alternator P terminal (E10)
[Between E-ECU and alternator]
Alternator IG terminal
[Between Key switch and alternator]
Alternator B terminal
[Between battery and alternator]
Between E10 and GND/E45/E47
NG
OK
TNV DI Service Manual
Terminal
• Check if the harness is damaged, or if the wiring is correct.
• Replace the harness.
• Check the alternator.
• Replace the E-ECU.
Continuity
Available OK: normal
Unavailable NG: harness disconnection
Available OK: normal
Unavailable NG: harness disconnection
Available OK: normal
Unavailable NG: harness disconnection
Unavailable OK: normal
Available NG: harness short-circuited with GND
FAILURE DIAGNOSIS
Specification
10 to 16 [V]
Status
1-169