Yanmar 6LY3 series Service Manual page 362

TROUBLESHOOTING
DTC Fault Code
DTC / FMI
1. Key switch ON
2. 5V sensor voltage is above 5.5V
P1230/0
3. 0.5 seconds
4. PWR REDUCTION, CHECK ENGINE on the TELEFLEX display
1. Key switch ON
2. 5V sensor voltage is below 4.5V
P1230/1
3. 0.5 seconds
4. PWR REDUCTION, CHECK ENGINE on the TELEFLEX display
Fail Mode ECU cannot get boost pressure value and defaults to limited operation condition.
Limited Operation
Maximum engine speed is limited to 1800 rpm.
Yes
Fail Release
When the sensor voltage goes to normal range (4.5 - 5.5V)
5V sensor affects all pressure sensors and sub-throttles.
P1230/0 or 1 cannot detect an open circuit, in 5V sensor wire harness. P1230/0, 1 can only detect a short
Remarks to ground. An open circuit will be shown as low voltage at sensor as a different failure code.
Sensor supply voltage must be kept below 6V. If sensor voltage exceeds 6V, sensor damage occurs.
Replace the pressure sensor. To check if the voltage exceeds 6V, check status of the DTC 1230/0.
Fault
DTC / FMI
P1230/0 5V sensor wire harness short to battery voltage
P1230/1 5V sensor wire harness short to ground
Troubleshooting Procedure
1. Check the 5V sensor wire harness (short).
2. Check the sub-throttle sensor wire harness.
3. Check the pressure sensor (boost, LO), wire harness and pressure sensor for a malfunction.
13-72
1. Condition, 2. Fault, 3. Time to Detect, 4. Display
© 2007 Yanmar Marine International
Troubleshooting by DTC Fault Codes
Probable Cause
6LY3 Service Manual
Check Point
Wire harness
(ECU)
Wire harness
Sensor
(ECU)