AEM **NEW 8-21-2007** - Updates Available for 30-1800 EMS
**NEW 8-21-2007** - Updates Available for 30-1800 EMS
http://forum.aempower.com/forum/index.php?board=29.0
-s-
There are a few hardware updates available for the 30-1800 EMS, and AEM would like to ensure that all RX-7 owners are aware that these fixes exist. The following circuits may need to be updated in all existing 30-1800 EMS units:
Throttle Position Sensor
This is a relatively well-known issue among RX-7 users: the RX-7 TPS sends two signals to the EMS, but only one of them is linear from 0-100% throttle. This fix will allow the EMS to work properly without switching wires on the RX-7 harness. Without this fix, the EMS sees the "narrow-range" signal, which should be a constant 4.5V between 40-100% throttle.
Air Conditioning Input
Unlike most other vehicles, the RX-7 doesn't use a simple on/off switch to activate the air conditioning, so this pin needs to be connected to a 0-5V analog input. This fix will allow the EMS to work properly with the factory air conditioning system.
Vehicle Speed Sensor
Although the RX-7 uses a magnetic-type speed sensor, this sensor is not directly connected to the EMS. The EMS receives a hall-effect style signal from the speedometer/gauge cluster. This fix will allow the EMS to detect vehicle speed, which can be useful for datalogging and/or boost control functions.
Check Engine Lamp
The Mazda factory service manual is unclear as to which pin controls the Check Engine Lamp. After some double-checking, we found the correct pin. Like most other outputs on the AEM EMS, the Check Engine Lamp can be configured to illuminate depending on RPM, Engine Load (boost), Throttle Position, Coolant Temperature, Vehicle Speed, and Air/Fuel Ratio (when the EMS is supplied with a proper wideband O2 signal).
If you would like to receive these updates, please call AEM Tech Support at 1-800-423-0046 for more information and instructions.
Throttle Position Sensor
This is a relatively well-known issue among RX-7 users: the RX-7 TPS sends two signals to the EMS, but only one of them is linear from 0-100% throttle. This fix will allow the EMS to work properly without switching wires on the RX-7 harness. Without this fix, the EMS sees the "narrow-range" signal, which should be a constant 4.5V between 40-100% throttle.
Air Conditioning Input
Unlike most other vehicles, the RX-7 doesn't use a simple on/off switch to activate the air conditioning, so this pin needs to be connected to a 0-5V analog input. This fix will allow the EMS to work properly with the factory air conditioning system.
Vehicle Speed Sensor
Although the RX-7 uses a magnetic-type speed sensor, this sensor is not directly connected to the EMS. The EMS receives a hall-effect style signal from the speedometer/gauge cluster. This fix will allow the EMS to detect vehicle speed, which can be useful for datalogging and/or boost control functions.
Check Engine Lamp
The Mazda factory service manual is unclear as to which pin controls the Check Engine Lamp. After some double-checking, we found the correct pin. Like most other outputs on the AEM EMS, the Check Engine Lamp can be configured to illuminate depending on RPM, Engine Load (boost), Throttle Position, Coolant Temperature, Vehicle Speed, and Air/Fuel Ratio (when the EMS is supplied with a proper wideband O2 signal).
If you would like to receive these updates, please call AEM Tech Support at 1-800-423-0046 for more information and instructions.
-s-
Just figured I'd give an update for us AEM Series 1 users. This is as of 4/20/2014.
Hi Ed,
An up to date 1800 unit will have a Rev. B Mods: E
We can issue an RMA for you to have the unit brought up to speed for $75 plus shipping. Please be aware that although we still service these series 1 units, parts for them have become scarce and almost all but unavailable. Updates on the hardware should not be an issue. If you should have future problems with communications, it is almost always generally linked to the EPROM chip on the main board. This part is no longer available and has always been an Achilles heel to the Series 1 units. There is a bright side to this problem should you experience it and that is an option to upgrade. Should we receive a unit in for repair that cannot be repaired, you will be entitled to receive a substantial discount on an upgrade to a Series 2 or Infinity unit. Please be aware that there are no Plug n Play applications for your vehicle when venturing towards an upgrade and that Customer wiring and a new Tune will likely be required to get you back up and running.
Pyng Thai
Technical Support
AEM Performance Electronics
(310) 484-2322 Ext. 252
AEM Electronics - Wideband O2 UEGO, Water/Methanol, Stand Alone Engine Management, Piggyback F/IC, Tru Boost Controller, Gauges, Automotive Performance Electronics
An up to date 1800 unit will have a Rev. B Mods: E
We can issue an RMA for you to have the unit brought up to speed for $75 plus shipping. Please be aware that although we still service these series 1 units, parts for them have become scarce and almost all but unavailable. Updates on the hardware should not be an issue. If you should have future problems with communications, it is almost always generally linked to the EPROM chip on the main board. This part is no longer available and has always been an Achilles heel to the Series 1 units. There is a bright side to this problem should you experience it and that is an option to upgrade. Should we receive a unit in for repair that cannot be repaired, you will be entitled to receive a substantial discount on an upgrade to a Series 2 or Infinity unit. Please be aware that there are no Plug n Play applications for your vehicle when venturing towards an upgrade and that Customer wiring and a new Tune will likely be required to get you back up and running.
Pyng Thai
Technical Support
AEM Performance Electronics
(310) 484-2322 Ext. 252
AEM Electronics - Wideband O2 UEGO, Water/Methanol, Stand Alone Engine Management, Piggyback F/IC, Tru Boost Controller, Gauges, Automotive Performance Electronics
