4. Hardware Installation
This chapter tells the user how to install and wire the SPITRONICS TCU. Be sure to read
precautions before attempting installation. There are a few do’s and don’ts’ to consider as well.
4.1 Compatibility to the old TCU series
Note that the Ver 3 SPITRONICS TCU may be upgraded to the Ver 20 software. The unit will have
to be sent to the factory for this upgrade at a cost and also an additional profile switch with
harness may be bought separately.
4.2 Harness Selection
The SPITRONICS TCU has different harnesses for all different Transmission configurations. Make
sure that you have the right harness according to the drawing. These harnesses differ mainly as
follows:
• Magnetic or Hall sensors require different voltages and are connected to the TCU on
different pins.
•
Different input and output combinations.
4.3 Installing Procedure of the TCU
• Locate a convenient mounting position for the TCU inside the cab for water protection.
Humidity and heavy duty service units are available on request and will be custom made.
• Ensure that the enclosure of the TCU is grounded with at least two metal screws onto the
metal body of the car. If the TCU is not bolted directly onto an earthed metal surface, you
MUST make sure that you run a 4mm
2
ground wire to one of the TCU’s bolt holes,
otherwise your TCU will not power up. There may flow as much as 20A through the earth
wire.
• Connect the two black wires firmly to the enclosure base. This is the screens of all the
cables.
• Feed all wires of the harness, except the serial cable, through a hole in the firewall. A good
seal around the wiring is necessary to prevent damage and Transmission fumes and water
from entering the cockpit.
• Each cable in the harness is marked to where it has to go. The same name is on the
electrical drawing. Wire colors are marked on the drawing for specific pin connections. Take
special care for TPS wiring as a fault here may damage the voltage regulator on the TCU.
• Pull additional PVC sleeve over the cables for extra protection of the harnesses. This
sleeve is customized on your installation and dependant on routing of the cables.
• The screened cables for the sensors must go to the sensor and connected as close as
possible. Connecting these wires to existing harness on the Transmission will cause the
wires to pick up electrical interference and cause erratic behavior of the TCU.
• No screen wires may be connected or earthed to the transmission or engine. They are
connected on the TCU side to the enclosure.
• Test each harness according to the drawing or to the optional test procedure to ensure
correct wiring, before connecting the TCU. This will indicate installation errors beforehand
which may damage the TCU.
• Plug the harness into the TCU and taking care not to damage the pins and connectors. If it
is sticky do not force it in. Rather move the connector slightly from side to side till it mates
with the TCU connector pins.
• The brown 12Volt supply wire for the solenoids on the common negative controllers must
be wired via a relay circuit directly from the battery with separate fuses in the positive
supply for protection. Do not wire any of these devices directly from the Ignition switch or on
the same circuit as the TCU. This will cause spikes which may damage or influence correct
operation of equipment. Earth connections must be as short as possible to earth and not
connected to a common earth wire which is connected at a distant ground.
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