Wiring of the LT110 Ride Height Sensor is simple. The three connections that must be made are the voltage supply, ground return, and the 0-5V analog output.
The 5-36V Supply should normally be connected to a fused 12V circuit in the vehicle. It should not be connected directly to a circuit powering an ignition system or other ‘noisy’ electrical component. Some ECU’s have outputs specifically for powering sensors. The LT110 consumes about 1W of power under most conditions. This means it will consume less than 0.1A when powered by 12V. If powered off of a 5V the sensor will consume about 0.2A. If powered off of a 5V sensor supply output from an ECU, care should be taken to ensure the output can supply the 200mA required. Many are not capable of doing this, so it is generally recommended to power the sensor from a 12V source.
FuelTech Setup
The analog output of the LT110 should be wired to one of the white input wires of the FuelTech ECU. In the Inputs menu of FTManager the input can be setup with 0-40″ scaled over the 0-5V input range.
Holley Setup
The analog output of the LT110 should be wired to one of the 0-5 volt sensor input wires of the Holley HP/Dominator ECU. The necessary type of input is type “5”. The LT110 sensor should be grounded using one of the sensor ground pins available on the ECU. Even though the LT110 has a 0-5V output it is not recommended to power it from the 5V sensor output in the ECU. Power should still come from a clean 12V source. In the I/O menu of Holley EFI software the input can be setup with 0-40″ scaled over the 0-5V input range.
