Yanmar 3TNV82A Troubleshooting Manual page 184

FAILURE DIAGNOSIS
EGR valve
Related DTC
P1402/4
P1403/3
P1412/4
P1413/3
DTC
P1422/4
P1423/3
P1432/4
P1433/3
Work flow
*For details of the work, see after-mentioned "<Work Description>."For the operation of the
diagnosis tool, see "Diagnosis tool Operation Manual" separately.
Initial diagnosis with the diagnosis tool
A. Check the current
failure display
B. Check the detected
value to estimate the
cause of failure.
1-182
Method and Procedure of Failure Diagnosis
Failure A with EGR valve (Step Motor A-Phase)
Failure B with EGR valve (Step Motor A-Phase)
Failure A with EGR valve (Step Motor B-Phase)
Failure B with EGR valve (Step Motor B-Phase)
Failure A with EGR valve (Step Motor C-Phase)
Failure B with EGR valve (Step Motor C-Phase)
Failure A with EGR valve (Step Motor D-Phase)
Failure B with EGR valve (Step Motor D-Phase)
DTC in the failure history indication
[Check items]: Step motor A-phase (B-phase, C-phase, D-phase)
• Contact status → ON
• Contact status → OFF
Check the failure
conditions.
Normal ?
Abnormal ?
TNV DI Service Manual
017552-00E