Specifications

87
Data Parameters Engine Parameters
OIL TEMPERATURE(°)
Range: _________________________________________ –40 to 199°C or –40 to 389°F
These ECM-calculated parameters indicate the engine oil temperature (EOT) based on the
signal voltage from the EOT sensor. The electronic level sensor is located in the engine sump
mounted to the engine oil pan.
The probe of the level sensor contains two temperature-sensing elements.
• One senses the engine oil temperature.
• The other is heated to 50°F (10°C) above the temperature of the engine and then is allowed
to cool.
The length of time it takes to cool the heated element is how the sensor determines the engine
oil level. When the oil level is high, it covers a larger portion of the probe submersed in the oil
sump. The engine oil around the probe absorbs the heat of the heated element more quickly
than if the level is low. The microprocessor in the base of the sensor produces a pulse width
modulated signal proportional to the oil level. The pulse width decreases with a decreased level
of oil.
The engine control module uses the EOT input signal to protect the engine during the cold
engine warm-up phase. On some models, the visual warning LEDs in the tachometer will
illuminate at cold engine start up and slowly be extinguished as the oil temperature increases.
The EOT sensor may also serve as an important input for VANOS operation, varying the
solenoid control based on oil temperature because oil temperature/viscosity effects camshaft
movement reaction time.
In the event of a oil temp/level sensor fault, the coolant temperature sensor reading may be used
as the substituted value.
PART LOAD FUEL TRIM (FUEL TRIM (PART LOAD)(%)
PART LOAD FUEL TRIM1 (FUEL TRIM 1(PART LOAD)(%)
PART LOAD FUEL TRIM2 (FUEL TRIM 2(PART LOAD)(%)
Range: _____________________________________________________ –100 to +100%
Multiplicative Mixture Adaptation, Part Load, Part Load—Bank 1, and Part Load—Bank 2
These parameters indicate the long term fuel trim (FT) correction the ECM is applying to the air/
fuel mixture during closed-loop operation over the middle to upper range of engine operation.
BMW uses the term “Multiplicative Mixture Adaptation” because it is a percent correction factor
based on the individual base injection value for each memory cell.
Cells are constantly updated based on feedback operation. If any cell stores an update that is
beyond the neutral feedback value, a correction is then factored into the injector pulse-width
calculation. To maintain the optimal air/fuel ratio of 14.7:1 for catalytic converter efficiency, the
ECM monitors the oxygen sensors and calculated load. From this information, the ECM
calculates a percent value that indicates how much to enrich or lean the fuel mixture.
Sometimes, the ECM makes fine tuning adjustments across the complete fuel map by adjusting
the IDLE FUEL TRIM (for example, when a fine-tune adjustment is needed across the range to
compensate for fuel injector drift).
PEDAL POSITION 1 (ACCEL.PEDAL POSITION SENSOR 1)(V)
PEDAL POSITION 2 (ACCEL.PEDAL POSITION SENSOR 2)(V)
Range: __________________________________________________________ variable
These parameters indicate the position of the accelerator pedal position (APP) sensor on
electronic throttle systems (EDK/MDK). The ECM determines accelerator pedal position using
APP sensors and changes throttle plate position with an electronic throttle plate actuator. BMW
uses two different systems: the MDK Hybrid and the EML full drive-by-wire system (see “Testing