Yanmar 6LY3 series - Page 341

TROUBLESHOOTING
Troubleshooting by DTC Fault Codes
12/05
6LY3 Service Manual
13-51
© 2007 Yanmar Marine International
P0220/3, 4 (Sub-Throttle Sensor)
Electrical Circuit Chart
See Sub-Throttle Indicator, Emergency Throttle Position Sensor on page 13-84.
DTC Fault Code
Remarks
*If the sub-throttle position sensor is replaced with YANMAR standard parts, check the specification of the
throttle potentiometer.
Fault
Troubleshooting Procedure
1. Check the sub-throttle voltage by YDT.
2. Check the wire harness and connectors. If wire harness is at fault, replace wire harness.
3. Check the sub-throttle position sensor.
DTC P0220/3, 4 Sub-Throttle Sensor
DTC / FMI 1. Condition, 2. Fault, 3. Time to Detect, 4. Display Check Point
P0220/3
1. Key switch ON
2. Input signal voltage to the ECU from the sub-throttle sensor is above 4.8V
3. 0.5 seconds
4. SEC THROTTLE on the TELEFLEX display
Wire harness sensor
P0220/4
1. Key switch ON
2. Input signal voltage to the ECU from the sub-throttle sensor is below 0.2V
3. 0.5 seconds
4. SEC THROTTLE on the TELEFLEX display
Wire harness sensor
Fail Mode
Fail mode will be different according to the position of the main throttle.
1. If the sub-throttle is active: Target engine speed slows to low idle speed. Target speed is set to low
idle in neutral and 1000 rpm in non-neutral condition.
2. If the sub-throttle is inactive (main throttle is active):
No fail mode happens to throttle control.
Limited Operation —
Fail Release
1. If the sub-throttle is active: No.
2. If the sub-throttle is inactive: Yes.
Remarks If sub-throttle is active, the key must be switched OFF and ON again to reset the fail mode.
DTC / FMI Probable Cause
P0220/3
1. Sub-throttle position sensor ground wire harness open.
2. Sub-throttle position sensor signal wire harness short to battery or 5V sensor.
P0220/4
1. Sub-throttle position SIGNAL wire harness open or short to ground.
2. Sub-throttle position 5V SENSOR wire harness open or short to ground.