MoTeC Global Forum

Hello
I'm about to have a go at making a custom Harness for my new M150 GPRP.

I think i know just enough to get myself into trouble!
Please forgive the Newbie questions.

With the Sensor 5 Volt A, B & C. Do they need to be combined with O Volt A, B & C when grouping up the Sensors?
I have all the Bosch Pressure with Temp combined Sensors so for example I read somewhere AT1 & AT2 need to use 0VA, AT3 & AT4 to use 0VB, so the 5V side of that sensor needs to be a matching 5VA & 5VB and so on?
Same with the Bridges do I need to keep Power & 0V grouped with A, B & C ?

What's the best output to use to Control the Holinger Shift Actuator? 2 x Peak & Hold?
Same for Fuel Pump Controller Peak & Hold?

What's the difference between Universal Digital inputs & Digital Inputs? Can i use either for the Clutch & Paddle shift Up & Down switches?

What's the best output for a Vtec Solinoid (12V) Should I use a Half Bridge for that ?

With the DBW Throttle (bosch 74mm) & Honda Pedal Sensor what does Main Voltage & Tracking voltage mean? does it matter which goes where to the sensor/throttle?

finally, i think... can i just use the 3 x can connections separately ie
1.- M150 to PDM
2.- M150 to Dash
3.- M150 to PDM. or is a single can trunk better to connect all the devices?

Appreciate your Advice.

Yes, you want to match the 5V supplies (5VA, 5VB, 5VC) with the matching reference grounds (0VA, 0VB, 0VC). Many sensor will have a ratiometric output that is relative to the 5V output, and the sensor calibration will need to be configured with what power supply was used.

You are correct that the Temperature Inputs have specific 0V outputs. Look at the help for configuring a temperature sensor in M1 Tune to use the correct one, and use the correct power supply for those Pressure / Temp sensors.

The Bridge Outputs would be relative to the battery ground, so I don't understand your question.

I typically use half-bridge outputs for most solenoid actuators. By carefully choosing your outputs, you can make it possible to swap terminal positions if you later need to change. I tend to use the LS Injection or Ignition outputs before the Peak & Hold Injector outputs for driving relays, or LED lights outputs.

The M1 Hardware manual says this about the Fixed Digital and Universal Digital inpus. Basically fixed digital would only normally be useful for switches or hall-effect -type sensors.

Fixed Digital
• Internal pull up (not switchable) – 4k7 to +3V3 supply.
Representative circuit
• Logic level – 2V threshold.
• 0-20KHz operation.
• Either 0, 4 or 7 Fixed DIG pins per device - hardware dependant.

Universal Digital
• Input waveform capture (10bit) range -10.668 to 11.472V ( 21.64mV per step)
• Programmable trigger levels +/-10V
• Programmable hysteresis levels 0.1 to 6.0V
• Programmable digital filtering
• Suitable for hall/optical and magnetic sensors
Representative circuit
• Switchable pullup resistor – 3k3 via diode to +5V supply.
• Can be used for REF/SYNC, CAM position, wheel speed, turbo speed etc. Can also be used as redundant
REF/SYNC.
• Diagnostics: Threshold Noise, Hysteresis Noise, Rejected Pulse and Small Pulse.
• Peak voltage 200V
• RMS voltage 70V
• Either 7, 8 or 12 UDIG pins per device - hardware dependant.

I was going to look at one of my K20 setups to see what I chose for the VTEC solenoid. Half-Bridge output would be safe.

Drive-By-Wire DBW setups have dual sensor outputs for both the Pedal and Throttle Positions. With only one sensor a failure might be impossible to detect. The two sensors need to track each other, and are referred to as the Main Voltage and Tracking Voltage in the M1 Tune software. Just hook them up to separate Analog Voltage inputs and select the resources in M1 tune.

I find it convenient to have all the MoTeC devices on the same bus (typically M150, LTC, PDM, Dash, Keypad), but you can separate them if you wish. The reason is the Dash will probably want to receive PDM Status (for logging), the M150 will want to communicate with the PDM to turn on fans & pumps.

Good Luck with your project!