Yanmar 3TNV82A Troubleshooting Manual page 193

Method and Procedure of Failure Diagnosis
3. Check of harness continuity:
• Remove the contact input switch and E-ECU from the harness.
• Check the harness continuity using a circuit tester.
Terminal
Switch signal wire E14 (*)
[Between E-ECU and switch connector]
Between E14 (*) and E38/E43/E48
(power supply line)
Between E14 (*) and E28/E45/E47(GND
line)/GND
*This table takes an oil pressure switch as an example.In the case of charge switch (E09), water temperature switch
(E17), air cleaner switch (E05), oil-water separator switch (E06), check the continuity using the same procedure.
NG
OK
TNV DI Service Manual
• Check if the harness is damaged, or if the wiring is correct.
• Replace the harness.
Check if the movement of the contact input switch is correctly recognized with the
diagnosis tool "Diagnosis Test". → Go to [4. Movement check of the contact input
switch:]
Continuity
Available OK: normal
Unavailable NG: harness disconnection
Unavailable OK: normal
NG: Harness short-circuited with power
Available
supply
Unavailable OK: normal
Available NG: harness short-circuited with GND
FAILURE DIAGNOSIS
Status
1-191