Wiring for M142 ECU

[shantim]

Hello Everyone!

I am currently connecting the Motec M142 ECU to my engine and therefore, I am doing the wiring. Only C and D connectors of the ECU can be used since wiring has only those two connectors. I have following doubts regarding the same:

1. For Hot film air mass sensor, there are four wires: Supply, Ground, Air mass flow signal and Air temperature signal. Which of the pins in the ECU can be used for air mass flow signal?

2. There are some position sensors also like EGR position sensor and Intake throttle position sensor. Which pin of the ECU C and D connector can be used for position sensor?

3. For TMAP or Intake manifold pressure and temperature sensors, can the temperature signal be connected to any of the analog temperature input and pressure signal to any of the analog voltage input? or do I need to ensure something?

4. For actuators, such as the EGR valve, can it be connected to any of the half bridge output?

Please guide me regarding this as soon as possible.

Thankyou.

[Stephen Dean]

Why do you not have the A and B connectors? These ECU's are designed around having all of the connectors in use, especially the Power and Ground supplies so not using them for more than a short period of time can lead to damage to the hardware.

1, Depending on the MAF sensor signal, usually a UDig is needed, but some will output a Voltage signal, which is wired into an AV input. The MAF signal is not used for tuning in the M1, just for information. The Temp signal will go into an AT input.

2, Throttle Position maybe into an AV input, or a Sent input which uses a UDig input. EGR most likely will be into a AV input.

3, The AT inputs are internally linked to 5V rails through 1k pullup resistors, because of this, you need to match them to their corresponding 0V buses, with AT1 & 2 to 5VA, AT 3 & 4 to 5VB and AT 5 & 6 to 5VC. Otherwise you can use any available AV and AT. If you are wiring in a TMAP sensor, make sure that the 5V supply used matches the 5V supply for the AT input that you are using.

4, Some actuators that are driven in both directions (DBW throttle for example) need to be wired to a Bridge output, this is done by wiring the actuator to the paired Half Bridge outputs, i.e. Bridge Output 1 consists of Half Bridge 1 and Half Bridge 2. If you allocate HB1 to a different Function, then Bridge Output 1 will not be available.