AEM Infinity Supported Applications - Mazda 1986-2002 16B & 20B Rotary - Manual (Page 3)

Infinity Supported Application 3
© 2014 AEM Performance Electronics
TRAILING IGNITION
The Mazda Rotary engines use a trailing ignition system. These trailing coils fire sequentially, regardless
of which ignition type is selected. A 2-axis ignition split table, "TrailingIgnSplit [deg]" is used to
determine the timing of the trailing ignition.
In the image below, the table on the left is the standard Ignition Map [degBTDC]. This table is still used
to determine the ignition timing of the leading ignition. The table on the right is the Ignition Split [deg],
used to determine the ignition timing of the trailing ignition.
The trailing ignition timing is calculated as IgnMap [degBTDC] - TrailingIgnSplit [deg] = Trailing Ignition
[degBTDC]. Therefore if the Leading Ignition fires as 25 [degBTDC] and there is an ignition split of +10
[deg], the Trailing Ignition will fire at 15 [degBTDC].
OIL METERING PUMP
The Infinity ECU has the ability to control the factory Oil Metering Pump (OMP), which uses a stepper
motor for flow control. The OMP control incorporates several failsafe options to minimize potential for
engine damage. Setup will be described in more detail; however the first step in setting up the OMP is to
follow the directions below to modify the factory wiring.
IMPORTANT! Oil Metering Pump Requirements
The factory wiring harness is designed to drive the Oil Metering Pump as a unipolar stepper motor (6
wires). However the Infinity ECU is designed to drive the OMP as a bipolar stepper motor, requiring the
removal of the two 12V wires. Failure to remove these 12V wires may affect the performance of the
stepper motor and may also cause damage to the Infinity ECU hardware.
Figure 1 below is a connector view showing the terminal position while observing the pin (male) terminal
side of the connector. The “---“ denotes an unused connector cavity, and should be used as a reference
point. Terminals C and D will need to be extracted from the connector and then properly isolated using
heat shrink tube or electrical tape.