Yanmar 3TNV82A Troubleshooting Manual page 179

Method and Procedure of Failure Diagnosis
4. Movement check of the relay:
• Connect the 2G eco-checker harness between E-ECU and machine's harness (for details, see [How to
use the 2G eco-checker harness] (P.1-135). And connect the all connectors (start assistant relay, E-
ECU).
• Connect the diagnosis tool, and log in to the diagnosis tool after key switch turning-on.
• Activate the start assistant relay by the diagnosis tool "Diagnosis Test: Active control", and measure
the voltage between terminals E44 and E45.
ON/OFF setting status
ON
OFF
NG
OK
TNV DI Service Manual
Voltage
2.5[V] and above OK: normal
Under 2.5[V]
1.75[V] and below OK: normal
Over 1.75[V]
• Check if the harness is damaged, or if the wiring is correct.
• Replace the harness.
Replace the E-ECU.
NG: Harness short-circuited with GND or E-ECU fault
NG: Harness short-circuited with power supply or E-
ECU fault
FAILURE DIAGNOSIS
Status
1-177