MoTeC M4 and M48 ECU
The MoTeC M4 (and M48) ECU outputs an 84 byte sequence of data at 9.6kbaud. This is the standard MoTeC M4 Set 5 data protocol. The ECU must be configured to output data set 5 at 9600 baud. From this data, the following channels are extracted.
ECU Name
| Race Technology message
| Race Technology Default name
| Race Technology VAR number
| Resolution
|
Engine Speed
| Engine RPM
| RPM
| VAR_0010
| 25 RPM
|
Throttle Position
| aux 1
| Throttle position
| VAR_2000
| 0.1%
|
Ambient Temp
| temperature 1
| temperature 1
| VAR_1000
| 0.1 oC
|
Coolant temp
| temperature 8
| Water temp
| VAR_1007
| 0.1 oC
|
Auxiliary temp
| temperature 25
| Aux 1
| VAR_1024
| 0.1 oC
|
ECU Temp
| temperature 16
| ECU temp
| VAR_1015
| 0.1 oC
|
Lambda short term trim
| aux 2
| Lambda 1 short trim
| VAR_2001
| 0.1%
|
Lambda long term trim
| aux 4
| Lambda 1 long trim
| VAR_2003
| 0.1%
|
Fuel injector duty cycle
| aux 6
| Fuel inj 1 PW
| VAR_2005
| 0.1%
|
Ignition cut level
| aux 22
| Ignition cut
| VAR_2021
| 0.1%
|
Fuel cut level
| aux 14
| Fuel inj 1 cut
| VAR_2013
| 0.1%
|
Fuel Aux Temp compensation
| aux 30
| Fuel aux temp comp
| VAR_2029
| 0.1%
|
Fuel Aux volt compensation
| aux 31
| Fuel aux volt comp
| VAR_2030
| 0.1%
|
Lambda
| misc 1
| Lambda 1
| VAR_4000
| 0.01 lambda
|
Manifold pressure
| pressure 5
| Boost pressure
| VAR_3504
| 0.1 kPa
|
Barometric pressure
| pressure 1
| Ambient air pressure
| VAR_3500
| 0.1 kPa
|
Battery voltage
| misc 3
| Battery voltage
| VAR_4002
| 0.01 V
|
Fuel actual pulse width
| measured time 1
| Fuel inj 1 PW on
| VAR_2500
| µs
|
Ignition Advance
| angle 2
| Ignition angle
| VAR_3001
| 0.1o BTDC
|
IMPORTANT: If your ECU is an M4 with serial number 2999 or lower, or any M48 ECU, the ECU Interface must be connected to the ECU via the MoTeC Computer Interface Cable. The cable must be connected the right way around (one end is labelled ECU), the other end must be connected to the ECU Interface connector marked ECU. This is a special cable that contains electronic circuitry, a standard cable will not work. If your ECU is an M4 with serial number 3000 or above the MoTeC Computer Interface Cable is not required – the Race Technology ECU interface should be connected directly to the ECU.
Note - Not all channels listed in the table(s) above may be available from your ECU. This can be dependent on the vehicle model & year of manufacture.