Yanmar 3TNV82A Troubleshooting Manual page 149

Method and Procedure of Failure Diagnosis
3. Check of harness continuity:
• Remove the foot pedal and E-ECU from the harness.
• Check the harness continuity using a circuit tester.
Terminal
Pedal signal wire (A) E14
[Between E-ECU and pedal connector]
Pedal signal wire (B) E13
[Between E-ECU and pedal connector]
Between E14 and other terminal/GND
and between E13 and other
terminal/GND
NG
OK
4. Foot pedal movement check:
• Connect the all connectors (foot pedal, E-ECU).
• Connect the diagnosis tool, and log in to the diagnosis tool after key switch turning-on.
• With the diagnosis tool "Diagnosis Test: Pulse/Analog etc.", operate the pedal to obtain the specified
sensor voltage watching "accelerator sensor position", and fix it at that opening.
• With the diagnosis tool "Diagnosis Test: Digital Input etc.", make "Foot pedal SW-NO" and "Foot pedal
SW-NC" be displayed, and check the status of ON/OFF.
Sensor voltage
0.65[V] and below
1.1[V] and above
TNV DI Service Manual
• Check if the harness is damaged, or if the wiring is correct.
• Replace the harness.
Check if the foot pedal movement is correctly recognized with the diagnosis tool
"Diagnosis Test". → Go to [4. Foot pedal movement check:]
Foot pedal
SW-NO
OFF
Other than above
ON
Other than above
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
SW-NC
ON Replace the E-ECU.
• Replace the harness.
• Replace the accelerator sensor.
OFF Replace the E-ECU.
• Replace the harness.
• Replace the accelerator sensor.
FAILURE DIAGNOSIS
Status
Action
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