Yanmar 3TNV82A Troubleshooting Manual page 158

FAILURE DIAGNOSIS
Cooling water temperature sensor
Related DTC
P0117/4
DTC P0118/3
P0119/2
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 sensor
resistance value
(sensor only)
2. Check of sensor
resistance value
(sensor + harness)
OK
4. Check of cooling
water temperature sensor
output voltage
1-156
Method and Procedure of Failure Diagnosis
Failure with Cooling Water Temperature Sensor (Low Voltage)
Failure with Cooling Water Temperature Sensor (High Voltage)
Intermittent Failure with Cooling Water Temperature Sensor
DTC in the failure history indication
[Check items]: Engine cooling water temperature - "Signal Data(SD)"
≤
• SD 200(0.2V)
• 200(0.2V)<SD<4800(4.8V)
• 4800(4.8V)
NG
NG
3. Check the harness
NG
OK
≤
SD
NG
continuity.
OK
TNV DI Service Manual
Check the failure
conditions.
Short-circuited with GND?
Normal
Disconnected?
Replace the sensor.
Replace the
harness.
Replace the E-ECU.
Replace the E-ECU
or
sensor.
Replace the E-ECU.
017539-00E