AEM 30-6620 Series 2 Plug & Play EMS - Manual (Page 7)

**Cam / Crank Angle Sensor: AEM trigger disc MUST be used
Discrepancies have been observed in the OEM cam/crank angle signals between model
years and/or trim levels; to avoid confusion the Series 2 EMS does not support the OEM
Nissan trigger pattern. A replacement trigger disc is now included with every Nissan EMS
and must be installed before attempting to start the engine. Two discs are supplied with
each 30-6620 EMS: one disc fits the CAS sensor found on RB, VG, CA and VE engines,
the other disc fits SR and ’99-‘03 Skyline GTR sensors. Please consult the following
instructions
supplement, which will be installed to the C:\Program
Files\AEM\AEMTuner\Instructions folder:
‘10-6600-B for EMS - 30-66XX supplement- CAS trigger install RB and SR engines.PDF’
‘10-6620-A for EMS - 30-6620 supplement- CAS trigger install RB, VG and VE
engines.PDF’
Engine Wiring Harnesses, ‘swapped’ engine installations
Many Nissan wiring harnesses have been found to contain significant differences between
model years and/or trim levels. Likely differences include: Crank signal, Cam signal,
Ignition switch wiring (the Ignition switch input controls the Main Relay output), injector and
coil destinations. Official documentation for many of these vehicles was not offered in
English, so it would be very wise to double-check the pinout destinations for these circuits.
This is especially true if the vehicle contains a ‘swapped’ engine or if the wiring harness
has been cut, spliced, soldered, re-routed, re-pinned or modified in any other manner. It is
the user’s responsibility to check that the wiring on the vehicle matches the pinout chart
contained in this instruction manual. AEM will not be held responsible for loss or damage
that can occur if the EMS is installed in a vehicle in which the wiring harness does not
match the AEM-supplied pinout chart!
The function of several pins have been changed from the original 30-1620, 30-1621, and
30-1622 EMS, please see the pinout chart for more info.
Primary Load Sensor, EMS Fuel Strategy
The factory MAF (mass air flow) sensor(s) can be removed to help decrease intake air
restriction; the EMS can be configured to use a MAP sensor to determine engine load.
It is recommended to use a 3.5 bar MAP sensor or higher (P/N 30-2130-50).
The factory Mass Air Flow sensor can be used as the primary load input for the AEM EMS
if desired (the EMS will only use one MAF sensor for fuel calculations even if the vehicle is
equipped with two). Please check the Notes section of each calibration for more info about
the vehicle setup and fuel strategy that calibration was configured to use.
EMS Fuel Map, Boost Fuel Trim Table
The 30-6620 maps provided utilize the “Boost Fuel Trim Table” to provide a 1:1 fuel
compensation above and below atmospheric pressure. In the startup calibration, the
“Boost Fuel Trim Table” is configured to provide twice as much fuel when the manifold
pressure is twice as high and half the fuel when the manifold pressure is half as high; this
should help simplify the tuning process for different vacuum and boost levels. Notice the
values in the main “Fuel Map” do not change above 100 kPa (0 psi boost), the fuel
correction is being made by the “Boost Fuel Trim Table.”
Note: the “Boost Fuel Trim Table” must be adjusted if a different MAP sensor is installed or
if the Load breakpoints are adjusted. The Boost Fuel Trim value should be set to -90 at
10kPa, 0 at 100 kPa, +100 at 200 kPa, +200 at 300 kPa, etc…