TROUBLESHOOTING
Troubleshooting by DTC Fault Codes
12/05
6LY3 Service Manual
13-61
© 2007 Yanmar Marine International
DTC Fault Code
Fault
Troubleshooting Procedure
See Troubleshooting the Pressure Sensor on page 13-77
.
DTC / FMI
1. Condition, 2. Fault, 3. Time to Detect, 4. Display
Check Point
P0520/3
1. Key switch ON
2. Input signal voltage is above 3.6V
3. 0.5 seconds
4. CHECK ENGINE on the TELEFLEX display
Wire harness
Sensor
P0520/4
1. Key switch ON
2. Input signal voltage is below 0.2V
3. 0.5 seconds
4. CHECK ENGINE on the TELEFLEX display
Wire harness
Sensor
Fail Mode
—
Limited Operation
No limited operation
Fail Release
Yes
When the input signal voltage goes to normal range (0.2 - 3.6V)
Remarks
Oil pressure is monitored for engine diagnosis use only.
Sensor supply voltage must be kept below 6V. Once the sensor supply voltage exceeds 6V, sensor
damage occurs. Replace the pressure sensor. To check if the voltage has been exceeded, check the
status of DTC 1230/0.
DTC / FMI
Probable Cause
P0520/3
1. SIGNAL wire harness short to high voltage over 5V
2. Sensor ground wire harness for the oil pressure sensor open
3. Sensor malfunction
P0520/4
1. SIGNAL wire harness open or short to ground
2. 5V sensor wire harness open
3. Sensor malfunction