>LOAD SENSOR SIGNAL
The load sensor uses one of two signals. It can either be an analog signal similar to the TPS signal or it can be a frequency-based signal. The frequency-based signal is similar to the uni-polar signal.
For an analog signal setting, the signal goes into the SMT6 via the blue wire and out of the SMT6 to the car’s ECU through the purple wire. In “Global Settings”, “Modes” all the modes support analog fuel tuning. The only setting you need to look out for is the lambda tuning option. If you enable this option, the fuel modification may not work correctly. Ensure that this option is not enabled at this point, even if you wish to tune Lambda.
For frequency-based tuning, the SMT6 needs to run in standard ignition frequency fuel mode in the Windows software. This can be set in the “Global Settings”, “Modes”. Select “10-Single ignition advance and retard + frequency fuel”. You will also need to know the lowest and highest frequency the sensor uses. This can be measured on a scope. The SMT6 can be set to recognise two different ranges of frequencies in the “Global Settings”, “System Config”. When “High frequency” is enabled (“ON”), the frequency range is changed from 10-3,3kHz to 80-18kHz. It may take a bit of “trial and error” to establish the range you do have. An incorrect setting will result in either flat fuel at low loads, if the mode is high when it should be low or flat fuel at high loads, if the mode is low when it should be high.
Wiring is fairly easy. Connect the white/red wire along with a pull-up (black/blue) to the sensor wire and the white/blue wire to the ECU.
Check that the set-up works by increasing and decreasing fuel values on the fuel map on the Windows tuning software.