AEM 30-3510 Infinity Plug & Play Harnesses - BMW 2001-2006 E46 M3 - Manual (Page 10)

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© 2014 AEM Performance Electronics
P/N 30-3510
There are a few integrated DBW fail safes incorporated into the Infinity system. The ECU constantly
monitors the accelerator pedal sensor voltage and throttle position sensor voltages to ensure the signals
are not excessively high or low due to damaged sensors, short circuits, or broken wires. The ECU also
performs self-diagnostics to ensure the electronic throttle is following desired DBW_Target properly, that
the DBW throttle control motor is not using excessive energy to move the throttle, and watching to see
that all the redundant sensors are working together as expected. If any of these conditions are
determined to be abnormal or unsafe, the ECU can shut the engine down to prevent unintended engine
acceleration. When the ECU shuts the engine off due to problems detected in the DBW system, the
AEM Infinity notifies the driver by illuminating the Engine Malfunction Lamp (EML) on the dashboard. This
error will reset when the ignition key is cycled or if the problem is fixed.
CAN BUS
The AEM Infinity EMS for the BMW E46 M3 supports the majority of the OEM features including:
Tachometer, Oil Temperature Gauge, Coolant Temperature Gauge, A/C Request Button, and Fuel
Consumption (MPG).
When the EMS is connected to a PC and changes are being committed either through table
values or the wizard, the CAN transmission may occasionally pause and the gauges will drop
out one at a time until they all stop working. This does not happen during normal operation.
Cycling the ignition switch will reset everything back.
NOTE: If the vehicle is used on rollers such as a dynamometer where the front wheels and rear wheels
are operating at completely different speeds, the DSC light, the TPMS (tire pressure monitoring system),
and the BRAKE light will illuminate as usual. When the vehicle is driven conservatively on a road, these 3
lights will be OFF like normal. However, if the tires experience any slippage, these 3 lights will flash ON/
OFF, warning the driver of traction issues. If the tires are excessively spun, these 3 lights may stay ON
replicating a dynamometer speed test. If this happens, a simple cycle of the ignition key will reset these
lights back to OFF.