39
Engine Management
SSP209/045
Intake Manifold Sensors
The intake manifold sensors are integrated
into a single module and installed in the
intake pipe.
• Manifold Absolute Pressure Sensor G71
• Intake Air Temperature Sensor G72
Manifold Absolute Pressure Sensor G71
Signal application
The Manifold Absolute Pressure Sensor
G71 supplies a signal that is required to
check the charge pressure (boost
pressure).
The Diesel Direct Fuel Injection Engine
Control Module J248 compares the actual
measured value with the setpoint from the
charge pressure map.
If the actual value deviates from the
setpoint, the Diesel Direct Fuel Injection
Engine Control Module J248 adjusts the
charge pressure via the Wastegate Bypass
Regulator Valve N75.
Effects of signal failure
The charge pressure can no longer
be regulated.
Engine performance drops.
Intake Air Temperature Sensor G72
Signal application
The Diesel Direct Fuel Injection Engine
Control Module J248 requires the signal
generated by the Intake Air Temperature
Sensor G72 as a correction value for
computing the charge pressure.
It can then make allowance for the effect
of temperature on the density of the
charge air.
Effects of signal failure
If the Intake Air Temperature Sensor G72
signal fails, the Diesel Direct Fuel Injection
Engine Control Module J248 uses a
fixed substitute value to calculate the
charge pressure.
This can result in a drop in
engine performance.
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