Fuel Volume Regulator; Charge Air Temperature Sensor - Yanmar BY Series Service Manual

Component Tests

Fuel Volume Regulator

This component controls fuel volume in the fuel
injection system. The ECU uses values supplied by
several sensors and sends corresponding signals
to control fuel pressure. It is mounted on the rear of
the high-pressure fuel pump.
Results of Failed Regulator
Failure of the regulator results in:
• Limitation of the injection rate (See Engine Faults
and Torque Limitations on page 13-3.)
• All high-pressure fuel system control is provided
by the fuel rail pressure control valve
IMPORTANT
If a fault code is set, check the fuel supply
and delivery first!
If this regulator is defective, the following P-codes
may be generated:
• P0001 - not connected
• P0003 - short circuit to ground
• P0004 - short circuit to B+
• 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
Test Values
• Resistance at 20°C (68°F): 3.0 ohm
Figure 12-17
1 – Pin 1 - 12V (Fuse F5)
2 – Pin 2 - Out (ECU pin 1/71)
BY Service Manual
1 2
0004169
ELECTRICAL AND ECU

Charge Air Temperature Sensor

This sensor measures the temperature of the
compressed air coming from the turbocharger. It is
mounted on the charge air pipe.
Results of Failed Sensor
Failure of the sensor results in:
• Limitation of the injection rate (See Engine Faults
and Torque Limitations on page 13-3.)
• Reduction in rated power
• Destruction of the sensor if short circuit to B+
If this sensor is defective, the following P-codes
may be generated:
• P0112 - short circuit to B+
• P0113 - No connection / short to ground
Test Values
• Resistance at -20°C (-4°F): 40 - 48 k-ohm
• Resistance at 0°C (32°F): 14.5 - 16.5 k-ohm
• Resistance at 20°C (68°F): 6.0 - 6.5 k-ohm
• Resistance at 120°C (248°F): 0.18 - 0.22 k-ohm
(1)
Figure 12-18
1 – Pin 1 - Out (ECU pin 1/57)
2 – Pin 2 - Ground (ECU pin 1/6)
(2)
0004168
12-21