Racelogic USER GUIDE Manual de usuario descargar pdf (Pagina 7)

RACELOGIC Traction Control Manual V3.0

Page 7

1.4 Injector Cut

1.4.1 General

Injector cut works by taking the signal supplied to each fuel injector and feeding it into

the Traction Control System. Under normal running the signal is exactly reproduced

firing the fuel injectors as normal. When wheel spin is detected the traction control

shuts down each fuel injector independently reducing the power of the engine

progressively. The severity of the cut is dependent upon the amount of wheel spin

detected and the parameters held within the Traction Control Unit.

By inspecting the fuel injectors of your vehicle you will see that two wires are

connected to each one. One of the wires supplies +12 V where as the other supplies

a 12V signal going down to GND to fire the injector. (see Diagram 2). It is these

“signal” wires that have to be located and connected to the Traction Control.

Diagram 2 - Signals To Fuel Injectors

1.4.2 Locating Signal Wires

The signal and 12V wires have to be connected to the correct pin of the fuel injector

so you have to find the “polarity” of the fuel injection system before fitment. The

polarity can be identified using a number of methods.

• Wiring Diagrams - If you have a wiring diagram of the vehicle trace each of the

signal wires from the engine control unit (ECU) to each of the fuel injectors, the

wiring diagram will normally indicate colour codes. The 12V feed wires will be

linked together and will generally have a common colour code. If you have books

such as the “Autodata - Fuel Injection” series these can help in identifying the

polarity of a vehicles fuel injection system.

• Colour Coding - If you have no wiring diagrams you can identify the polarity by

looking at the wiring to the fuel injectors. If each of the fuel injectors is fed by a

common wire of one colour this will be the 12V feed, the remaining wires should

all be different colours and will be the signal wires.

• Continuity Testing – On the majority of cars the 12V side of the fuel injectors are

linked together. Place the multi-meter on one injector and check with the next

injector, if one side continuity beeps back check the rest of the injectors.

12v

Signal In

Permanent 12v

12v

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Racelogic USER GUIDE Manual de usuario Pagina 7