Diagnosis Description; Check Of Harness Continuity - Yanmar 3TNV82A Troubleshooting Manual

FAILURE DIAGNOSIS

Diagnosis Description

1. Check of the input voltage of the rack position sensor (harness + E-ECU)
• Turn the key switch off, and remove the rack actuator connector from the fuel injection pump. At this
time, keep the E-ECU connector being connected to E-ECU.
• Turn the key switch on to turn on the E-ECU power.
• Measure the voltage between sensor terminal E43 and E28 using a circuit tester.
Sensor connector E43 - E28
NG
OK

2. Check of harness continuity:

• Remove the rack actuator connector and E-ECU from the harness.
• Check the harness continuity using a circuit tester.
Terminal
Sensor signal wire E36
[Between E-ECU and sensor connector]
Sensor GND wire E28
[Between E-ECU and sensor connector]
Sensor 12V wire E43
[Between E-ECU and sensor connector]
Between E36 and other terminal/GND
and between E43 and other
terminal/GND
Between E28 and GND/E45/E47
Between E28 and other terminals
NG
OK
1-138
Terminal
Check the harness for correct continuity. → Go to [2. Check of harness continuity:]
Check if the "Directive rack position control" is executable using the diagnosis tool
"Diagnosis Test: Active control". → Go to [3. Execution check of the directive rack
position control:]
• Check if the harness is damaged, or if the wiring is correct.
• Replace the harness.
Check if the "Directive rack position control" is executable using the diagnosis tool
"Diagnosis Test: Active control". → Go to [3. Execution check of the directive rack
position control:]
Method and Procedure of Failure Diagnosis
Equivalent to the battery voltage
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
Available OK: normal
Unavailable NG: harness disconnection
Unavailable OK: normal
NG: harness short-circuited with another
Available
wiring
TNV DI Service Manual
Normal value
Status