AEM Infinity Supported Applications - Mazda 1986-2002 16B & 20B Rotary - Manual (Page 7)

Infinity Supported Application 7
© 2014 AEM Performance Electronics
Oil Metering Pump Basic Setup
The Infinity ECU is set up to control the Mazda Oil Metering Pump. The Mazda OMP uses a stepper
motor with voltage feedback. The voltage feedback is used by the Infinity to verify stepper motor position.
There are two failsafes to prevent engine damage in the case of a sensor or stepper motor malfunction.
These will be discussed in more detail. The following layout will be helpful throughout this section. If you
plan to configure the OMP manually, add a new page to your layout and include the following 2-axis
tables and text grids.
The OMP sensor feedback can be seen in its raw voltage value as “OMP_Feedback [V]. However the
feedback is scaled to a 0-100% range, shown as channel “OM_Position [%]”. The load tables
“OMP_Load [%]” and “OMP Load [%] Failsafe” both output a % position rather than voltage. The output
from these tables can be seen as “OMP_PositionReq [%]”, which uses either table based on failsafe
conditions. By default, the tables are populated with values that increase with both engine load and
engine speed.
Failsafes
The first failsafe utilizes the table “OMP Load [%] Failsafe”. This table is used in the event of a MAP
sensor error. If the channel “ErrorMAP” shows a value of 1 or 2, the channel “OMP_PositionReq [%]” will
automatically be calculated using OMP Load [%] Failsafe rather than OMP Load [%]. Therefore both
tables need to be populated with useable values.
The second failsafe is based on OMP position and sensor voltage. If either channels
“OMP_Error_Position” or “OMP_Error_Sensor” are non-zero, the channel “OMP_Failure” will equal 1.
This means that the sensor position indicates an error relative to the requested position, or that there is
a sensor failure. In either case, user adjustable engine protection will activate. OMP Engine Protection
will be described in the wizard section below.