Haltech F9A - Manual (Page 91)

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switch input. This signal indicates that the transmission is hot, and engaged in top gear. When
this is the case, the lockup solenoid is activated regardless of road speed whenever the throttle
is more than 4% opened.
To use the TCC function, you must have the following:
- the F9A secondary harness incorporating Road Speed and Auxiliary I/O connectors;
- a square wave signal road speed indicator whose frequency is proportional to road
speed;
(this may require a unit for signal conditioning, such as the Haltech
TM
RA1)
- access to the wiring of the torque converter lockup solenoid and 4th gear/overtemp
switch;
- F9 programming software and cable.
Wire the TCC solenoid to the appropriate output line on the Auxiliary I/O connector, and, if it
is available, the 4th gear/overtemp signal to the Aux. In line (the blue flywire on the F9
primary harness.) The 4th gear/overtemp signal must be a pull-to-ground style signal. If you
are not using this feature, leave the blue flywire disconnected, but insulate the end to ensure
sure that it will not short to the bodywork.
To determine vehicle speed, a square wave signal must be applied to the road speed input
connector. This connector possesses ground and 12 volt signals for powering a Hall effect or
optical sensor. A magnetic or reluctor type signal is incompatible, and you will need to
convert the output from this style of pickup to a square wave. The Haltech
TM
RA1 Reluctor
Adapter would perform satisfactory conditioning.
Once the wiring is complete, run the F9 software in Online mode and go to the Identification
page. The parameter Road Speed Value must be set with the number of pulses expected per
kilometre. If you are unsure of the exact value for this parameter, enter an approximate
number and check against the vehicle's speedometer. Adjust the Road Speed Value until the
road speed displayed on the Engine Data Page and the actual vehicle speed agree.
Go to the Options page in the software, and select the Torque Converter Lockup function on
the appropriate output. The map for the TCC function indexes the vehicle road speed against
the throttle position. When, for any given throttle position, the road speed is greater than that
displayed in the map, the solenoid will be energised. The road speed must then fall 8 kph
(5mph) for the clutch to be disengaged. This 8 kph hysteresis should prevent solenoid
oscillation during cruising near the cut-off point. The default map activates the solenoid at 70
kph at smallest throttle opening, and increases the activation threshold to 160kph at 70%
throttle. Although this map may be customised as required, it is advisable to never engage the
lockup below 60 kph (40 mph).
NB: When using the TCC function, the Aux. In/Out Function in the Identification must be
set for Torque Converter Control. When using TCC, other function that use the Aux.
Input/Output line can not be used.