AEM 30-6100 Series 2 Plug & Play EMS - Manual (Page 4)

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This product is legal in California for racing vehicles only and should never be used on public highways.
f) Set the throttle range: Select Wizards>>Set Throttle Range and follow the on-screen
instructions. When finished, check that the ‘Throttle’ channel never indicates less than
0.2% or greater than 99.8%, this is considered a sensor error and may cause some
functions including idle feedback and acceleration fuel to operate incorrectly.
4) Ready to begin tuning the vehicle.
a) Before starting the engine, verify that the fuel pump runs for a couple of seconds when
the key is turned on and there is sufficient pressure at the fuel rail.
If a MAP sensor is installed, check that the Engine Load indicates something near
atmospheric pressure (approximately 101kPa or 0 PSI at sea level) with the key on and
engine off. Press the throttle and verify that the ‘Throttle’ channel responds but the
Engine Load channel continues to measure atmospheric pressure correctly.
b) Start the engine and make whatever adjustments may be needed to sustain a safe and
reasonably smooth idle. Verify the ignition timing: Select Wizards>>Ignition Timing
Sync from the pull-down menu. Click the ‘Lock Ignition Timing’ checkbox and set the
timing to a safe and convenient value (for instance, 10 degrees BTDC). Use a timing
light and compare the physical timing numbers to the timing value you selected. Use the
Sync Adjustment Increase/Decrease buttons to make the physical reading match the
timing number you selected.
c) Note: This calibration needs to be properly tuned before driving the vehicle. It is
intended for racing vehicles and may not operate smoothly at idle or part-throttle.
NEVER TUNE THE VEHICLE WHILE DRIVING
5) Troubleshooting an engine that will not start
a) Double-check all the basics first… engines need air, fuel, compression, and a correctly-
timed spark event. If any of these are lacking, we suggest checking simple things first.
Depending on the symptoms, it may be best to inspect fuses, sufficient battery voltage,
properly mated wiring connectors, spark using a timing light or by removing the spark
plug, wiring continuity tests, measure ECU pinout voltages, replace recently-added or
untested components with known-good spares. Check that all EMS sensor inputs
measure realistic temperature and/or pressure values.
b) If the EMS is not firing the coils or injectors at all, open the Start tab and look for the
‘Stat Sync’d’ channel to turn ON when cranking. This indicates that the EMS has
detected the expected cam and crank signals; if Stat Sync’d does not turn on, monitor
the Crank Tooth Period and T2PER channels which indicate the time between pulses
on the Crank and T2 (Cam) signals. Both of these channels should respond when the
engine is cranking, if either signal is not being detected or measuring an incorrect
number of pulses per engine cycle the EMS will not fire the coils or injectors.
c) If the Engine Load changes when the throttle is pressed this usually indicates that there
is a problem with the MAP sensor wiring or software calibration (when the EMS detects
that the MAP Volts are above or below the min/max limits it will run in a failsafe mode
using the TPS-to-Load table to generate an artificial Engine Load signal using the
Throttle input). This may allow the engine to sputter or start but not continue running
properly.