Specifications
64
Data Parameters Engine Parameters
LOWER P. LOAD F. TRIM CYL 1-6, RIGHT
LOWER P. LOAD F. TRIM CYL 4-6, RIGHT
LOWER P. LOAD F. TRIM CYL 7-9, LEFT
LOWER P. LOAD F. TRIM CYL 10-12, LEFT
Range: __________________________________________________________ variable
Used on ME27 and ME28 systems. These fuel trim numbers represent the long term correction
to the fuel injection pulse width when the engine is under partial load. This number is learned by
the ECU and is used to correct small differences between engines and engine wear. When the
short term correction is outside the window defined in the ECU memory, the long term fuel trim
(P. LOAD F. TRIM) is changed. P. LOAD F. TRIM can modify injector duration using a self-
adaptation factor. A 1.0 reading represents the neutral base adjustment point. Readings greater
than 1.0 indicate that the duration of injection is currently being extended because the system is
running lean. Readings less than 1.0 indicate that the duration of injection is currently being
shortened because the system is running rich. This injection corrective factor affects only those
adaptive learn memory cells controlling long term fuel correction in the part-load operation (lower
to mid-range). The pre-programmed base pulse width (original fuel, RPM/Load mapping with no
correction) determines the actual corrected injector pulse. For ME27 systems the parameter
values range from 0.750 to 1.280; for ME28 systems, the values range from 0.680 to 1.320.
LR VSS
Range: ___________________________________________________ 0 to vehicle max.
Used on EGS systems. This parameter indicates the speed of the left rear wheel based on input
signals to the ECU from the wheel vehicle speed sensor (VSS). The measurement units can be
changed from KPH to MPH.
M39(RECIR. AIR FLAP ACT.)VOLT.1
M39(RECIR. AIR FLAP ACT.)VOLT.2
Range: ______________________________________________________ not available
Used on SIM4 supercharged systems. The supercharger air flap directs supercharged
compressed air into exhaust manifold during engine warm-up or into the engine at the intake
manifold. This system uses a dual potentiometer as a back-up reference check.
MANIFOLD AIR PRESSURE
Range: ____________________________________ 0 to 1000, ±100 mbar or 0 to 5.12 V
Used on ME27, ME28 and SIM4 systems. The manifold absolute pressure (MAP) sensor
provides an analog voltage parameter that varies with manifold pressure. The voltage is low
when the absolute pressure is low and is high when the absolute pressure is high. Either the
ECU or the Scanner calculates a manifold absolute pressure reading in millibars (mbar) from the
MAP sensor voltage signal.
MANIFOLD ABS. PRESSURE (MAP)
MANIFOLD AIR PRESSURE DIFF
Range: ________________________________________________0 to 1000, ±100 mbar
Used on EZ, ME10 and ME20 systems. This parameter displays intake manifold absolute
pressure in millibars (mbar), and is used for adjusting camshaft timing and detecting EGR flow.
NOTE: Some ME10 and ME20 systems also display MAP sensor voltage, which ranges from 0
to 5.12 volts.
MASS AIR FLOW SENSOR
Range: __________________________________________________________ YES/NO
Used on DM and DM2 systems. This parameter indicates whether the mass air flow (MAF)
sensor is operating correctly or not.