Yanmar 3TNV82A Troubleshooting Manual page 213

Factor Analysis
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TNV DI Service Manual
Wire breakage or short-
Intermittent on/off of
circuit in CSD solenoid
CSD solenoid valve
valve
Wire breakage or short-
circuit in harness, or
connector contact
failure
Rack actuator
Rack actuator malfunction due to
malfunction excessive hysteresis
etc.
Wire breakage or short-
circuit in harness, or
connector contact
failure
Intermittent on/off of Contact failure of relay
actuator relay contact
Wire breakage or short-
circuit in relay coil
Wire breakage or short-
circuit in harness, or
connector contact
failure
Wire breakage or short-
Rack position sensor
circuit in sensor, or
signal failure
output failure
Wire breakage or short-
circuit in harness, or
connector contact
failure
Speed sensor signal Reversed polarity of
failure speed sensor harness
Wire breakage or short-
circuit in speed sensor
Wire breakage or short-
circuit in harness, or
connector contact
failure
Intermittent fluctuation Wire breakage or short-
of accelerator sensor circuit in accelerator
signal sensor
Wire breakage or short-
circuit in harness, or
contact failure in
connector
FAILURE DIAGNOSIS
Check method
CSD solenoid valve system
Check conduction of CSD. error: P1242/4, P1243/3,
P1244/2
Check error occurrence, tool CSD solenoid valve system
data, harness shaking, and error: P1242/4, P1243/3,
conduction with tester. P1244/2
Check rack actuator operation Rack actuator system error:
and hysteresis. P1212/4, P1213/3, P1211/7
Check error occurrence, tool
Rack actuator system error:
data, harness shaking, and
P1212/4, P1213/3, P1211/7
conduction with tester.
Check error occurrence, tool
Rack actuator system error:
data, impact on relay, and
P1212/4, P1213/3, P1211/7
conduction with tester.
Check error occurrence, tool
Actuator relay system error:
data, impact on relay, and
P1222/4, P1223/3, P1224/2
conduction with tester.
Check error occurrence, tool
Actuator relay system error:
data, harness shaking, and
P1222/4, P1223/3, P1224/2
conduction with tester.
Check error occurrence, tool
Rack position sensor system
data, and conduction with
error: P1202/4, P1203/3
tester.
Check error occurrence, tool
Rack position sensor system
data, harness shaking, and
error: P1202/4, P1203/3
conduction with tester.
Check polarity difference
between harness drawing and
actual harness.
Check error occurrence, tool
Speed sensor system error:
data, and conduction with
P0340/4
tester.
Check error occurrence, tool
Speed sensor system error:
data, harness shaking, and
P0340/4
conduction with tester.
Check error occurrence, tool Accelerator sensor system
data, and conduction with error: P0222/4, P0223/3,
tester. P0224/2
Check error occurrence, tool Sensor 5V system error in
data, harness shaking, and addition to above: P0642/4,
conduction with tester. P0643/3, P1644/2
Relevant DTC Remarks
1-211