Charge Air Temperature Sensor; Charge Air Pressure Sensor - Yanmar BY Series Service Manual

Component Tests
12/05
• 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
Figure 12-17
1 – Pin 1 - 12V (Fuse F5)
2 – Pin 2 - Out (ECU pin 171)

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 - Charge air temperature over 125°C
(257°F)
• P0113 - Charge air temperature under -20°C
(-4°F)
Test Values
• Resistance at -20°C (-4°F): 40 to 48 k-ohm
• Resistance at 0°C (32°F): 14.5 to 16.5 k-ohm
• Resistance at 20°C (68°F): 6.0 to 6.5 k-ohm
• Resistance at 120°C (248°F): 0.18 to 0.22 k-ohm
BY Service Manual
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© 2009 Yanmar Marine International
ELECTRICAL AND ECU
Figure 12-18
(1)
Figure 12-18
1 – Pin 1 - Out (ECU pin 157)
2 – Pin 2 - Ground (ECU pin 16)

Charge Air Pressure Sensor

This sensor measures the charge air pressure as
absolute value (charge air pressure + atmospheric
pressure). It is mounted on the charge air pipe and
is sealed by an O-ring.
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.)
If this sensor is defective, the following P-codes
may be generated:
• P0238 - Boost pressure at 4 bar (58 psi)
(absolute)
• P0237 - Boost pressure under 0.5 bar (7.3 psi)
(absolute)
• P0236 - plausibility check fail
Test Values
Note: Pressure is kPa (absolute)
• Relation to supply voltage:
Vout = (2/875 x pressure value - 1/70) x supply
voltage
Examples:
• At 5V supply voltage and atmospheric pressure
(98 kPa), Vout is approximately 1.04 V
• At 5V supply voltage and 200 kPa (absolute),
Vout is approximately 2.21 V
(2)
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