Yanmar 3TNV82A Troubleshooting Manual page 87

DTCs (Diagnostic Trouble Codes) General Description
Diagnosis Description
1) Initial diagnosis
with the diagnosis
tool
2) Check of
connectors/wiring
3) Failure Diagnostic
Work
TNV DI Service Manual
• Check the fault indication.
• Check the output signal of the EGR step motor.
• Check the movement of the EGR step motor by the active control function.
*For details of the method and the procedure of diagnosis, see P.1-182
• Before beginning your work, be sure to turn off the key switch.
• Check that the connector of the EGR step motor is correctly inserted.
• Check that the wiring of the EGR step motor is not disconnected or the
insulation of the wiring is not peeled.
• Check the coil resistance of the EGR step motor.
• Check the harness for correct continuity.
*For details of the method and the procedure of diagnosis, see P.1-182
FAILURE DIAGNOSIS
1-85