TROUBLESHOOTING
Troubleshooting by DTC Fault Codes
13-80 6LY3 Service Manual
© 2007 Yanmar Marine International
• Check the sensor signal output and the 5V sensor voltage.
Comment: Sensor signal output range
4. Checking the 5V sensor wire harness:
• Disconnect the ECU and unplug the sensor connector.
• Check for an open / short circuit (continuity test).
Case 2: When the DTC is not active (logged status):
• ECU stores the DTC information and the YDT indicates a logged DTC. If a connector comes loose, it may
be the reason for a logged DTC.
• Clear the DTC information first, then it becomes easy to identify when the new DTC comes on.
• Check the wire harness around the pressure sensor and ECU. Check if DTC comes again.
Terminals Value
A - B (pressure sensor connector) 0.5V (engine stopped)
A - C (pressure sensor connector)
5V
Wire harness is already checked at 1.
Defective
Replace the pressure sensor.
Replace the ECU if the pressure sensor replacement does not make a difference.
OK Replace the ECU.
Terminals Voltage Status
Wire harness connector A - B
Below 0.5V
Just below 0.5V may be
an error.
Failure:
1. Open circuit B- [ECU_P***]
2. Open circuit C- [ECU-SNS5]
3. Short to ground circuit B- [ECU_P***]
0.5V <
[ECU_P***]
V < 3.6V
OK: Normal
above 3.6V
Failure:
1. Short to battery C- [ECU_SNS5]
2. Short to battery B- [ECU_P***]
Terminals Continuity Status
[ECU_SNS5] - C
Good OK: Normal
Defective Failure: Open circuit
[ECU_SNS5] - A / B /
other terminal /
ground / Battery +
Defective OK: Normal
Good Failure: Short circuit
DTC Contents
Yes
Check if the DTC comes on.
Check the connector terminal and wire harness.
Replace the wire harness.
No
No action at this time
Wait and see if same DTC occurs.
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