ABS Sensor Wiring

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Do not use 'T taps' or similar to connect the Traction Control module to the wheel speed sensor wiring.

 

The traction control module is designed to work with inductive ABS sensors.  These have two wires from each sensor.  The wiring from the traction control module to ABS sensors wires should be kept short.  The pair of wires for each wheel should be twisted - this reduces the effect of any interference.

 

tc-harness-600

 

ABS Sensor Type

The ABS wheel speed sensors can either be inductive or active.  Generally, vehicles before 2004 have inductive ABS sensors (including the 2005-2006 RSX & S2000).  Vehicles after 2004 have active ABS sensors (including all TSX, 2006+ Civic).

 

You can tell if your vehicle has inductive or active ABS sensors by measuring the resistance across a wheel speed sensor.  Inductive sensors usually are 900 ohms, active sensors have infinite resistance when un-powered.  The vehicle manual will also use a different symbol for inductive and active wheel speed sensors.

 

abs-inductive

Inductive Wheel Speed Sensor

 

abs-active

Active Wheel Speed Sensor

 

See Connector Wiring for wheel speed sensor wiring colors for common vehicles.

 

Inductive ABS sensor Wiring

Vehicles without an ABS controller can wire the wheel speed sensors directly to the Traction Control module.   Vehicles with an ABS controller need to wire the Traction Control module in parallel with the wheel speed sensors.

 

wiring-inductive

Inductive Wheel Speed Sensor Wiring

 

Working on one pair of wheel speed sensor wires at a time, remove some of the plastic insulation from each wire.  This is easiest to do with a sharp knife or razor blade.  It is best to remove the insulation in a different place on each wire (about 1" / 3 cm apart) so that, even if the insulation fails, the bare wires cannot short out. You only need to remove enough plastic insulation to expose the copper wire.

 

Strip the ends of the Traction Control wiring harness.  With a soldering iron 'tin' both the Traction Control wiring harness wires and the vehicle wheel speed sensor wires which were bared above.

 

Join the Traction Control wiring harness to the wheel speed sensor wires by holding together and applying heat with the soldering iron.  Make sure the connection is secure.

 

Insulate the join with tape.  Self amalgamating tape is recommended, as it will stay water-proof.

 

When finished use a zip-tie to bind the vehicle wiring and Traction Control wiring harness together to prevent any strain on the soldered joints.

 

Active ABS sensor Wiring

Active ABS sensors need to be wired in series with the Traction Control module.  The Traction Control module should be connected to the negative side of the wheel speed sensor wiring.

 

wiring-active

Active Wheel Speed Sensor Wiring

 

Identify the negative wire from the wheel speed sensor.  Cut the wire, strip and join to the Traction Control module input.  The polarity of the wires from the Traction Control module is not important. Solder the joint and use heat-shrink to ensure a water-proof connection, then use zip ties for strain relief, and finally protect from abrasion with electrical tape.

 

Hall Effect Sensor Wiring

For Hall effect sensors wire the Traction Control wheel speed sensor inputs negative to ground and the positive side to the wheel speed sensor signal line.

 

wiring-halleffect

 

The ABS sensor type switch should be off.  The sensor power supply may be either 5V or 12V depending on the sensor used - check with the sensor manufacturer.

 

Active Sensor with no ABS Controller

For active ABS sensors without an ABS controller, each sensor should be powered from battery voltage via a 270 ohm resistor to the positive side of the sensor. The negative side of the sensor is wired to the Traction Control IN+, and the Traction Control IN- wired to ground.

 

wiring-noabs-active

The ABS sensor type switch should be on. The resistor power rating is not important - a typical 1/4 watt resistor will work.

 

Traction Control ABS Sensor Type

 

The traction control module uses an internal switch to select what ABS sensor type is in use.  The switch is located inside the traction control case next to the USB connector.

 

circuit-board

 

For inductive, hall effect and other sensor types the switch should be off (the white slider should be towards the outside of the circuit board). This is the factory default.

 

For active ABS sensors the switch should be on (the white slider should be towards the center of the circuit board).  There may be a green plastic cover over the switch.  In this case, peel away the green plastic to change the switch position.

 

Testing

After wiring the wheel speed sensors to the Traction Control module, you can test the wiring using a laptop and the Traction Control software.  At this point you do not need to connect the Traction Control power and ground, as the Traction Control module can be powered from the USB connector.

 

Spin each wheel in turn, and check that the Traction Control module wheel speed lights flash.  Normally you do not need to spin the wheels very quickly for the Traction Control module to pick up the wheel speed.