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h) NOTE: The throttle range on this vehicle is set differently from other EMS applications! Disconnect the
DBW connector on the throttle, then perform the procedure as follows by holding the throttle open and
closed manually at the throttle plate. Set the throttle range: Select
Wizards>>Set Throttle Range
. When
finished, check that the ‘Throttle’ channel never indicates less than 3.2% or greater than 99.8% (must be
2.2% or more since the DBW throttle will close slightly when the engine starts) – this is considered a
sensor error and may cause some functions including idle feedback and acceleration fuel to operate
incorrectly. Since this application uses the original drive-by-wire system, it is highly recommended that
after calibration is complete, the throttle is rechecked to ensure that the minimum throttle never causes the
Error Throttle channel to turn on. This would happen when the vehicle is off and the key is turned on.
Step 5
Ready to Begin Tuning the Behicle
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 (10 degrees BTDC for
instance). Remove the cylinder 1 ignition coil (closest to front of engine), add a spark plug wire between
the ignition coil and the spark plug, and place the timing light pickup on the added spark plug wire. Use a
timing light to 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. Crankshaft timing marks are not labeled for some vehicles. Consult the factory service manual for
more information. The diagram below shows labels for the original timing marks. “A” points to the timing
indicator and “B” points to the red mark that is located 5° before top dead center.
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 A VEHICLE WHILE DRIVING.
