Yanmar 3TNV82A Troubleshooting Manual page 176

FAILURE DIAGNOSIS
START ASSIST RELAY
Related DTC
P1232/4
DTC P1233/3
P1234/2
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.
Current failure
exists.
B. Check the detected
value to estimate the
cause of failure.
Failure diagnosis flow
1. Check of relay
coil resistance
(relay only)
2. Check of relay
coil resistance
(relay + harness)
OK
4. Movement check
of the relay
(use diagnosis tool)
1-174
Method and Procedure of Failure Diagnosis
Failure A with Start Assist Relay
Failure B with Start Assist Relay
Intermittent Failure with Start Assist Relay
DTC in the failure history indication
[Check items]: Air heater relay 1
• Contact status → ON
• Contact status → OFF
NG
NG
3. Check the harness
continuity.
NG
OK
Check the failure
conditions.
Normal ?
Abnormal ?
NG
Replace the
harness.
OK
Replace the ECU
or
harness.
Replace the
E-ECU.
TNV DI Service Manual
Replace the
relay.
017547-00E