DIY CAN Bus Analyzer for Fiat Linea (Incomplete!!!Being Developed ….)

OBD-II Port Details
Tyco/AMP produces the in-car (female) side of the plug as part numbers 179631 or 348822, and both use the same pins, either P/N 776001 or 1827012. Molex has a similar offering; the pins are P/N 50420, and the housings are 51115 (with a 51117 retainer) and 51116 (with a 51118 retainer). Delphi/Packard's part numbers are 11210250 for the housing and 12129373, 12129484, 13525297, and 15317769 for the pins (female Metri-Pack 150).
The client-side connection is pretty ubiquitous. The Molex P/Ns are 57964 for the pins, and 68503 for the housing. Delphi shows 12110252 as the P/N for the housing, and 12040993, 12047581, 12059894, 12092165, 12110502, 12160811, 15305307, or 15326725 for the pins (male Metri-Pack 150), depending on the size you need.
OBD-II Port Details

CAN Bus Location in Fiat Linea

Interface Board

 

Test Setup

Hardware:- 18F4550 , MCP2551 , MCP2515, 2x20MHz Crystals, 220nf Cap, 4x10KOhms, Headers

Development :  CCS Compiler, MPLAB IDE, PICKIT3 Programmer and Debugger, USB-RS232 FTDI Breakout Board

Loopback Test Program to verify especially MCP2515 CAN Trans-receiver (RS232 MODE)

Connection Matrix as follows

PIC18F4550	MCP2515
PIN NO 27 (D4) SPP4	PIN NO (16) CS
PIN NO 33  (B0) SDI	PIN NO (15)SO
PIN NO 26 (C7) SDO	PIN NO (14)SI
PIN NO 34 (B1) SCK	PIN NO (13)CLK
PIN NO 16(C1) CCP2	PIN NO (12)INT

 

Code Sample:

#include <18F4550.h>
#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV1,VREGEN
#use delay(clock=48000000)
#use rs232(baud=9600, xmit=PIN_E1,rcv=PIN_E2)
//not used only for diagnostic
#define LED    PIN_D1

// These connections are for the Microchip MCP2510 Dev. board 
#define EXT_CAN_CS   PIN_D4  
#define EXT_CAN_SO   PIN_B0
#define EXT_CAN_SI   PIN_C7
#define EXT_CAN_SCK  PIN_B1 

#include <can-mcp251x.c> 

void main(void) 
{ 
int32 can_id; 
int can_data[8]; 
int can_length, counter; 
struct rx_stat rxstat; 

puts("Can Sample");

can_init(); 
puts("Can init done"); 

can_set_mode(CAN_OP_LOOPBACK); 
puts("Loopback mode set"); 

counter = 0; 
puts("Starting"); 

can_data[0] = 0x55; 

while(1) 
{ 
    if(kbhit()) 
      { 
       getch(); 

       if(can_putd(42, can_data, 1, 3, TRUE, FALSE)) 
             puts("tx ok"); 

       while(!can_kbhit()); 
    
       if(can_getd(can_id, &can_data[0], can_length, rxstat)) 
             puts("rx ok"); 

       counter++; 
    } 
} 

} 

Loopback Test Program to verify especially MCP2515 CAN Trans-receiver (USB CDC)

#include <18F4550.h>
#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV1,VREGEN
#use delay(clock=48000000)
#use rs232(baud=9600, xmit=PIN_D1,rcv=PIN_E2)
//not used only for diagnostic
#define LED    PIN_D1

// These connections are for the Microchip MCP2510 Dev. board 
#define EXT_CAN_CS   PIN_D4  
#define EXT_CAN_SO   PIN_B0
#define EXT_CAN_SI   PIN_C7
#define EXT_CAN_SCK  PIN_B1 

#include <can-mcp251x.c> 
#include <usb_cdc.h>

void main(void) 
{ 
char c;
int32 can_id; 
int can_data[8]; 
int can_length, counter; 
struct rx_stat rxstat; 

puts("Can Sample");

can_init(); 
puts("Can init done"); 

can_set_mode(CAN_OP_LOOPBACK); 
puts("Loopback mode set"); 

counter = 0; 
puts("Starting"); 

can_data[0] = 0x55; 
usb_init_cs();
while(1) 
{ 
    usb_task();

    if(usb_cdc_kbhit()) 
      { 
       c=usb_cdc_getc();

       if(can_putd(42, can_data, 1, 3, TRUE, FALSE)) 
            printf(usb_cdc_putc,"tx ok"); 

       while(!can_kbhit()); 
    
       if(can_getd(can_id, &can_data[0], can_length, rxstat)) 
              printf(usb_cdc_putc,"rx ok"); 

       counter++; 
    } 
} 

}