Installation

The Macchina M2 was designed to be modular to give you the option of many installation options. The under-the-dash (UTD) version plugs directly into the OBD2 port of any modern car. The under-the-hood (UTH) version can be spliced into a wire harness. A connector is the only difference between the 2 versions.

Under-the-Dash (UTD)

The "Under-the-Dash" version of the M2 plugs directly into the OBD2 port of the modern car. Any car built after 1996 has an OBD2 port near the steering wheel, under the dash.

The OBD2 connector is a 16 pin connector that provides power and a data connection. The image below shows the pin orientation of this 16 pin connector.

This following table describes the functionality of each pin.

Pin Schematic name function
1 SWC_BUS Single Wire CAN
2 J1850+_BUS J1850 + BUS
3 MSC_BUS+ CAN1 HIGH
4 CHASSIS CHASSIS GND
5 DGND Digital GND
6 HSC_BUS+ CAN0 HIGH
7 9141_K_BUS K-LINE or LIN channel 1
8 TP2_NET Test Point
9 TP1_NET Test Point
10 J1850-_BUS J1850 - BUS
11 MSC_BUS- CAN1 LOW
12 TP3_NET Test Point
13 TP4_NET Test Point
14 HSC_BUS- CAN0 LOW
15 9141_L_BUS L-LINE or LIN channel 2
16 VIN +12V INPUT

Under-the-Hood (UTH)

The "Under-the-Hood" version of the M2 is exactly the same as the "Under-the-Dash" version, but rather than a OBD2 connector, it uses a more general purpose connector. This connector takes the form of a 24-pin pluggable connector. Typical usage for this connector would be a more permanent installation where M2 would be hard-wired or spliced into an existing cable harness.

The image below shows the pin orientation of the 24 pin connector. Notice that the top row has the ODD pins and the bottom row has the EVEN pins.

This following table describes the functionality of each pin.

Pin Schematic name function
1 TP1_NET Test Point
2 SWC_BUS Single Wire CAN
3 J1850-_BUS J1850 - BUS
4 J1850+_BUS J1850 + BUS
5 DGND Digital GND
6 DGND Digital GND
7 MSC_BUS- CAN1 LOW
8 MSC_BUS+ CAN1 HIGH
9 DGND Digital GND
10 DGND Digital GND
11 TP3_NET Test Point
12 CHASSIS CHASSIS GND
13 TP4_NET Test Point
14 DGND Digital GND
15 DGND Digital GND
16 DGND Digital GND
17 DGND Digital GND
18 DGND Digital GND
19 HSC_BUS- CAN0 LOW
20 HSC_BUS+ CAN0 HIGH
21 9141_L_BUS L-LINE or LIN channel 2
22 9141_K_BUS K-LINE or LIN channel 1
23 VIN +12V INPUT
24 TP2_NET Test Point

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