Aem 30-1600 Ems 240sx / Sentra / Pulsar / Nx Altima / Blue Bird / G20 1989-1994 on 2040-parts.com

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1) Removing the Stock Engine Control Unit
a) Access the stock Engine Control Unit (ECU). The 240SX ECU is found behind the
passenger-side kick panel. All other Nissan engine control units are found on the
floor in front of the center console.
b) Carefully disconnect the wiring harness from the ECU. Avoid excessive stress or
pulling on the wires, as this may damage the wiring harness. Some factory ECUs use
a bolt to retain the factory connectors, and it must be removed before the harness
can be disconnected. There may be more than one connector, and they must all be
removed without damage to work properly with the AEM ECU. Do not cut any of the
wires in the factory wiring harness to remove them.
c) Remove the fasteners securing the ECU to the car body, and set them aside. Do not
destroy or discard the factory ECU, as it can be reinstalled easily for street use and
troubleshooting.

2) Installing the AEM Engine Management System.
a) Plug the factory wiring harness into the AEM EMS and position it so the wires are not
pulled tight or stressed in any manner. Secure the EMS with the provided Velcro
fasteners.
b) Plug the comms cable into the EMS and into the PC (not supplied).
c) Install the supplied AEM CD and open the AEMPro software.
d) Turn the ignition “on” but do not attempt to start the engine.
e) Go to: “ECU | Send New Calibration”. Upload the base calibration file (.cal) that most
closely matches the vehicle’s configuration to be tuned. Full details of the test vehicle
used to generate each map can be found in the “Notes” section in the “Setup”
window of the AEMPro software. The base maps can be found in the Nissan folder
located in: “My Computer | Local Disk (C:) | Program Files | AEM | AEMPro | Startup
Calibrations”
f) Set the throttle range: Select the “Configure” drop down menu, then “ECU Setup | Set
Throttle Range” and then follow the instructions given on the screen.
g) Verify the ignition timing: Select the “Configure” drop down menu, then “ECU Setup |
Set Ignition”. Use a timing light and compare the physical engine timing to the
parameter “Ignition Timing” displayed. Use the “Advance/Retard” buttons to make the
timing number match.
h) Calibrate the lambda sensor channel (UEGO Only): With the ignition “on” and the
sensor unplugged, change the “O2 #1 Gain” (Setup | Sensors | Oxygen Sensor |
Oxygen Sensor #1 | Options - O2 Sensor #1) until the “O2 #1 Volts” parameter
displays 3.94 Volts (+/- 0.02 Volts). This should yield an “O2 #1 Gain” near 1.28. If
using the non-UEGO EMS, keep the “O2 #1 Gain” at 1.0.

3) Ready to begin tuning the vehicle.
a) Note: This calibration needs to be properly tuned and is not recommended for street
use. NEVER TUNE THE VEHICLE WHILE DRIVING.

Product detail: 

Connection Diagram for EMS P/N 30-1600 can be found on your computer after the software has been installed.  Instruction location:

 C:\Program Files (x86)\AEM\AEMPro\Instructions

Description of Plug n Play means the Unit plugs into your existing harness. That's it! You still need to install software on your lap top (AEM Pro-Can be found on AEM website for free) and load a calibration as well as set it up and tune. 

Warning! Do not buy this if you have no experience with standalone engine management systems. A professional should be involved in the install and setup process. 

Unit has been tested and all hardware revisions and modifications are up to date.  Communications are responding correctly. Unit comes loaded with a base calibration. 

Warranty is 30 days with me for defects and faulty hardware only. Damage to unit unit hardware is not covered under the 30 day warranty and will have to be returned to me to have repaired for a $100 fee. Please read the connection diagram instructions and verify everything is correct on your side.