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