High-Pressure Fuel Rail Pressure Sensor; Camshaft Speed Sensor - Yanmar BY Series Service Manual

ELECTRICAL AND ECU
Figure 12-19
Figure 12-19
1 – Pin 1 - 5V (ECU pin 139)
2 – Pin 2 - Ground (ECU pin 180)
3 – Pin 3 - Out (ECU pin 154)
High-Pressure Fuel Rail Pressure
Sensor
This sensor measures the fuel pressure in the fuel
rail. The values are used by the ECU for fuel
quantity regulation and fuel pressure regulation. It
is mounted on the front of the fuel rail. The ECU
supplies 5V and ground.
Results of Failed Sensor
Failure of the sensor results in:
• Default value in the ECU
• Limitation of the injection rate (See Engine Faults
and Torque Limitations on page 13-3.)
NOTICE: If a fault code is generated, check the
fuel supply and delivery first.
If this sensor is defective, the following P-codes
may be generated:
• P0088 - fuel rail pressure out of range
• P0087 - fuel rail pressure out of range
• P0089 - fuel rail pressure out of range
• P0090 - fuel rail pressure out of range
• P0193 - no connection / short circuit B+
• P0192 - short circuit to ground
Test Values
• At 0 bar (0 psi) (relative): 0.5 V
• At 1800 bar (26107 psi) (relative): 4.5 V
12-20
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© 2009 Yanmar Marine International
Figure 12-20
Figure 12-20
1 – Pin 1 - Ground (ECU pin 178)
2 – Pin 2 - Out (ECU pin 156)
3 – Pin 3 - 5V (ECU pin 130)

Camshaft Speed Sensor

This sensor measures the speed of the camshaft.
This value is compared with the crankshaft speed
by the ECU. It is mounted on the cylinder head
cover near the front of the engine.
Results of Failed Sensor
Failure of the sensor results in:
• Difficulty starting and reduction in power (See
Engine Faults and Torque Limitations on
page 13-3.)
If this sensor is defective, the following P-codes
may be generated:
• P0344 - disagreement between camshaft speed
sensor and crankshaft speed sensor
• P2614 - no connection / short circuit
Figure 12-21
Figure 12-21
1 – Pin 1 - 12V (Fuse F5)
2 – Pin 2 - F_out (ECU pin 187)
3 – Pin 3 - Ground (ECU pin 115)
BY Service Manual
Component Tests
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