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Turbo speed sensor wiring

Practical Harness Construction - Club Level

Discussion and questions related to the course Practical Harness Construction - Club Level


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I have a link G4+ and a EFR speed sensor and have seen other people use a divider circuit successfully to reduce the max pulses under 500hz for the DI inputs on the g4+.

My 1st question is: can I run a 3 core (24awg) shielded cable from expansion plug to the sensor ie 5V power, ground and signal? and have no issues?

Some kits you can buy appear to have this so any interference must not be an issue supposedly although they output a 0-5v signal to be fed to an analogue input.

The 5 volt will supply both the sensor and divider IC.

2nd question is: should the high frequency ground go to ECU ground and not the sensor ground on the expansion plug? read somewhere its best to keep high frequency grounds away from normal sensor grounds.

Any help much appreciated!

Since it is not a critical sensor such as a trigger I would not bother with shielding it. I have never used shielding with them or wheel speed sensors and seen a problem.

Either ground will work fine and again I have never seen any negative effects from connecting high frequency signals to the sensor ground (a 60-2 crank sensor for instance is a good example of a reasonably high frequency signal that is always connected to sensor ground).

Many thanks for that Adam! makes it simple then.