Yanmar 6LY3 series Service Manual page 364

TROUBLESHOOTING
P1603/0 (ECU Temperature Too High)
DTC
DTC Fault Code
DTC / FMI 1. Condition, 2. Fault, 3. Time to Detect, 4. Display
1. Key switch ON
2. ECU temperature is higher than 85°C (185°F)
P1603/0
3. 0.5 seconds
4. CHECK ENGINE on the TELEFLEX display
Fail Mode —
Limited Operation
No limited operation
Yes
Fail Release
After the fault has been cleared and also when the ECU temperature drops below 80°C (176°F)
Remarks Around 50°C (122°F) is the usual temperature at hot condition.
Fault
DTC / FMI
P1603/0
Troubleshooting Procedure / Recommendations
If the DTC gets active often, please keep the engine room temperature below 60°C (140°F) at all times.
Example: Improve the ventilation and the temperature of the engine room.
13-74
P1603/0 ECU Temperature Too High
Poor ventilation in the engine room
© 2007 Yanmar Marine International
Troubleshooting by DTC Fault Codes
Check Point
Cooling freshwater / seawater system
Environment around the ECU (engine room
temperature)
Probable Cause
6LY3 Service Manual