Yanmar 3TNV82A Troubleshooting Manual page 182

FAILURE DIAGNOSIS
Work Description
1. Check of resistance value of the CSD solenoid valve coil (solenoid valve only):
• Remove the CSD solenoid valve connector from the harness.
• Measure the resistance between CSD solenoid valve side terminals C and D using a circuit tester.
(REF) Coil resistance of the CSD solenoid valve
CSD solenoid valve side C - D (400W)
NG
OK
2. Check of resistance value of the CSD solenoid valve coil (solenoid valve + harness):
• Connect the CSD solenoid valve and the harness.
• Remove E-ECU from the harness.
• Measure the resistance between E-ECU connectors E41 and B00 using a circuit tester.
*See above-mentioned "(REF) Coil resistance of Yanmar standard CSD solenoid valve".
NG
OK
3. Check of harness continuity:
• Remove the CSD solenoid valve connector from the harness, and remove E-ECU from the harness.
• Check the harness continuity using a circuit tester.
Terminal
CSD Solenoid Valve (upstream side) E41
[Between E-ECU and sensor connector]
Between E41 and GND/E28/E45/E47
Between E41 and E43/E48
NG
OK
1-180
Terminal
Replace the solenoid valve.
Check the coil resistance of the CSD solenoid valve with the CSD solenoid valve
connector and the harness being connected. → Go to [2. Check of resistance value
of the CSD solenoid valve coil (solenoid valve + harness):]
Check the harness for correct continuity. → Go to [3. Check of harness continuity:]
Check the movement of the CSD solenoid valve by a diagnosis tool. → Go to [4.
Movement check of the CSD solenoid valve:]
• Check if the harness is damaged, or if the wiring is correct.
• Replace the harness.
Check the movement of the CSD solenoid valve by a diagnosis tool. → Go to [4.
Movement check of the CSD solenoid valve:]
Method and Procedure of Failure Diagnosis
Continuity
Available OK: normal
Unavailable NG: harness disconnection
Unavailable OK: normal
Available NG: harness short-circuited with GND
Unavailable OK: normal
NG: Harness short-circuited with power
Available
supply
TNV DI Service Manual
Specification
8Ω (at 23°C)
Status