Haltech E6A - Manual (Page 76)

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Install the idle air circuit and the stepper motor, and attach the idle speed motor to its
connection on the E6A harness. Run the E6A programming software Online and go to the
Output Options Page. Ignition will need to be switched on.
The idle speed motor is only adjusted when the ECU determines that the engine is in an idle
condition; that is, throttle closed (0%), and engine speed and manifold pressure within limits
(see below).
14.3 Adjusting the Idle Speed Control
There are ten parameters to be adjusted in the idle speed control.
Enable/Disable: The Idle Speed Control can be switch on or off.
Target Idle Speed: This is the engine speed that the ECU attempts to maintain at idle.
Cold Idle-Up RPM: This speed is added to the Target Speed when the engine temperature is
cold.
Pulse Divider: With a value of 1, the stepper motor would be pulsed every 4mS. In some
cases this may be faster than the motor is capable of reacting, or may cause the engine speed to
oscillate. Increasing this parameter reduces the rate at which the stepper motor is pulsed.
Post-Start RPM: This value is added to the Target Idle Speed for the first 20 seconds after
starting. It is of particular use in preventing stalling due to heat soak when starting a warm
engine.
Norm Idle Bar: When manifold pressure is used as the load sensor, excessive vacuum can be
used as an indication that the engine is not at idle (i.e.. the wheels are driving the engine), and
so the E6A will not alter the idle speed motor. To determine this value, go to the fuel maps
while the engine is idling and press
² ²
. The range and bar numbers will appear in the top right
corner of the screen. Enter that bar number in this field - the idle motor will be ignored at a
lower manifold pressure.
NB: If using throttle position as the load parameter, set this value to 1.
Cold Temperature Limit: the temperature below which the engine is defined as being cold,
and thus the Cold Idle-Up would apply.
Rpm Operation Limit: If the engine rpm is above this speed, the idle motor will not be
moved. To ensure the system will never "hang" with the idle valve open, choose a speed higher
than that at which the engine will run with the idle air-bypass passage fully open.
Hot Opening Value: The Idle Speed Motor can be opened up by a programmable amount
when the ignition is first turned on. The Hot Opening value determines what amount to open
when the engine is above the Cold Temperature Limit. The value is a number between 1 and
100, but is not a percentage of the total opening range. The value should be set to give the
desired flare up Rpm when the engine is hot.