
RACELOGIC Traction Control Manual V3.0
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1.11 Cars with only 3 wheel speed sensors
Some cars have a single sensor for the rear wheel speed that is mounted on
the differential e.g. Nissan 200SX and some older Mercedes Benz. This
means that the TC system cannot calibrate itself automatically. This can only
be done via a laptop using the software.
1.11.1 Procedure for configuring cars with 3 wheel speed sensors
1) Locate the three sensor wires, (See
1.5.3 Connecting Traction Control ABS Wires).
2) Identify which signal wire is from the rear sensor.
This can be done using any of the following methods
•
Wiring Diagrams - If you have a wiring diagram of the vehicle, trace each of the
sensor wires to the ABS unit, the wiring diagram will normally indicate colour
codes. If you have books such as the “Autodata - Anti Lock Braking Systems”
series these can help in identifying the wiring. (Contact Racelogic if you do not
have one).
• Multimeter – Select “Continuity Test” on the meter. Locate the rear sensor and
place one probe on the signal wire at this point. Probe each of the three known
sensor wires at the ABS controller until the meter gives an audible tone signifying
the rear sensor signal wire.
• Supplied Software – Connect any 3 of the traction control wheel speed wires to
the three known ABS signal wires on the car (Leaving one wire from the traction
control disconnected). Run the software and open the graph window to enable
you to monitor their function. Generally the front and rear sensors will be using a
different number of reference points. Since the ‘pulses per revolution’ in the
traction control unit for front and rear are set the same, the channel connected to
the rear sensor when driving in a straight line will record a different speed. Using
the information below you can identify which channel is associated with which
traction control wheel speed wire and therefore which signal wire is from the rear
sensor.
Traction control wheel speed channel 1 = Red
Traction control wheel speed channel 2 = Blue
Traction control wheel speed channel 3 = Yellow
Traction control wheel speed channel 4 = Green
If the rear sensor does not use a different number of reference points, you can
still locate which traction control channel is connected to it by turning a tight
corner. In this situation the rear wheel speed will be the last to change state.
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