obd 2 pinout for GM cars
Should be suitable for most modern GM cars - Buick, Cadillac, Chevrolet, Daewoo
GMC, Holden, Opel, Vauxhall.
GMC, Holden, Opel, Vauxhall.
Most GM cars produced in 1996-2003 use J1850-VPW interface. GM cars produced in 2003-2006 use J1850-VPW interface or CAN. Most cars produced after 2006 are equipped with CAN bus.
Pin Number | Pin Name | Description |
1 | Second UART | |
2 | J1850 | J1850(+) VPW |
3 | Comfort | |
4 | GND | Chassis ground |
5 | SGND | Signal Ground |
6 | HS-CAN | PCM |
7 | K-Line | n/c |
8 | CCM | |
9 | first UART | |
10 | PWM | n/c |
11 | EVA controller | |
12 | ABS | |
13 | SIR | |
14 | HS-CAN(-) | E&C |
15 | L-Line | n/c |
16 | Battery+ | Battery +, unswitched |
Since 2002, there is another pinout - GM-LAN (for vehicles equipped with CAN bus)
Pin Number | Pin Name | Description |
1 | SW-LS-CAN (33kB) or DW-FT-CAN (+) (<125kB) | |
2 | J1850 | n/a |
3 | MS-CAN (+) (95kB) | |
4 | GND | Chassis ground |
5 | SGND | Signal Ground |
6 | HS-CAN | ISO 15765 HS-CAN (+) (500kB) |
7 | K-Line | n/a |
8 | n/a | |
9 | DW-FT-CAN (-) (<125kB) | |
10 | PWM | n/c |
11 | MS-CAN (-) (95kB) | |
12 | K-Line (KW82 Prot.) | |
13 | reserved | |
14 | HS-CAN(-) | ISO 15765 HS-CAN (-) (500kB) |
15 | L-Line | n/a |
16 | Battery+ | Battery +, unswitched |
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OBD-2 compatibility list
Note that list is not 100% complete!
Model | Engine | Year (starting from) | OBD-2 Protocol |
---|---|---|---|
Buick Century | 2002 | VPW J1850 | |
Buick Rivera | 1998 | VPW J1850 | |
Buick Skylark | 1996 | VPW J1850 | |
Cadillac Deville | 2000 | VPW J1850 | |
Cadillac Eldorado | 1998 | VPW J1850 | |
GMC Jimmy | 1999 | VPW J1850 | |
GMC K2500 | 1997 | VPW J1850 | |
GMC Lumina | 2001 | VPW J1850 | |
GMC Yukon | 1998 | VPW J1850 | |
Chevrolet Astra | 2.0 Flex Power, Gasoline (127 HP) | 2004 | ISO 14230-4, ISO 9141-2 |
Chevrolet Aveo | 1.4, Gasoline (60HP) | 2005 | KWP FAST |
1.6, Gasoline (103HP) | 2005 | KWP FAST | |
1.6, Gasoline (103HP) | 2007 | KWP FAST | |
1.2, Gasoline (70HP) | 2008 | KWP FAST | |
1.5, Gasoline (?HP) | 2008 | KWP FAST | |
Gasoline (84 HP) | 2009 | ISO 14230-4 | |
1.2, Gasoline or LPG (82HP) | 2009 | KWP FAST | |
Chevrolet Blazer | 1995 | VPW J1850 | |
Chevrolet Blazer LT | Gasoline (191 HP) | 1997 | VPW J1850 |
Chevrolet Camaro | 1997 | VPW J1850 | |
1997 | ISO 14230-4, ISO 9141-2 | ||
1998 | VPW J1850 | ||
3.8 V6, Gasoline (193HP) | 1998 | VPN | |
1999 | VPW J1850 | ||
5.7 LS1, Gasoline (288HP) | 1999 | VPN | |
2000 | VPW J1850 | ||
L36, Gasoline (191 HP) | 2002 | VPW J1850 | |
6.2 V8, Gasoline (405HP) | 2012 | CAN 11bit (500kb) | |
Chevrolet Caprice | 1996 | VPW J1850 | |
Chevrolet Captiva | 2.0 VCDI, Diesel (150HP) | 2006 | CAN 11bit (500kb) |
2.2 VCDI, Diesel (163HP) | 2011 | CAN 11bit (500kb) | |
Chevrolet Cavalier | 1996 | VPW J1850 | |
1998 | VPW J1850 | ||
1999 | VPW J1850 | ||
Chevrolet Cobalt | Gasoline (145 HP) | 2006 | CAN |
Chevrolet Corvette | 2000 | VPW J1850 | |
V8, Gasoline (400HP) | 2007 | CAN 11bit (500kb) | |
Chevrolet Corvette C5 | 5.7 V8, Gasoline (350HP) | 2003 | VPN |
Chevrolet Corvette C6 | 6, Gasoline (404HP) | 2005 | ISO 9141 |
LS7, Gasoline (512HP) | 2007 | CAN 11bit (500kb) | |
6.2, Gasoline (436HP) | 2008 | CAN 11bit (500kb) | |
Chevrolet Cruze | 2.0 VCDi, Diesel (150HP) | 2010 | CAN 11bit (500kb) |
2.0 VCDI, Diesel (163HP) | 2011 | CAN 11bit (500kb) | |
Chevrolet Epica | 2.5, Gasoline (155HP) | 2004 | KWP FAST |
2.0 vdCi, Diesel (150HP) | 2007 | CAN 11bit (500kb) | |
Chevrolet Evanda | Gasoline (176 HP) | 2005 | |
Chevrolet Express van | V8 5.3L, Gasoline (300HP) | 2003 | VPN |
Chevrolet HHR | Gasoline (168 HP) | 2008 | |
Chevrolet Impala | 2000 | VPW J1850 | |
2002 | VPW J1850 | ||
Chevrolet Kalos | 1.4 SE, Gasoline (93 HP) | 2005 | ISO 14230-4, ISO 9141-2 |
1.4 16V, Gasoline (93 HP) | 2006 | ISO 14230-4 | |
Chevrolet Lumina | 1996 | VPW J1850 | |
Chevrolet Malibu | 1997 | ||
Chevrolet Malibu | 3.1 V6, Gasoline (150HP) | 2000 | VPN |
Chevrolet Matiz | 1.0 SE LPG.i, Gasoline (64HP) | 2006 | KWP FAST |
Gasoline (66 HP) | 2007 | ISO 14230-4, ISO 9141-2 | |
0.8, Gasoline (65HP) | 2009 | KWP FAST | |
Chevrolet Nuriba | 1.8 BVA, Gasoline or LPG (122HP) | 2006 | KWP FAST |
Chevrolet Optra | 1.6, Gasoline (109HP) | 2005 | KWP FAST |
Chevrolet Orlando | 1.8, Gasoline (146HP) | 2012 | CAN 11bit (500kb) |
2.0 HDi, Diesel (163HP) | 2012 | CAN 11bit (500kb) | |
Chevrolet Rezzo | 1.6 16v, Gasoline or LPG (107HP) | 2005 | ISO 9141 |
Chevrolet S10 | 2000 | VPW J1850 | |
Chevrolet Silverado | 2002 | VPW J1850 | |
6.5, Diesel (194HP) | 1996 | VPN | |
Chevrolet Spark | Gasoline (81 HP) | 2008 | |
1, Gasoline (68HP) | 2011 | KWP FAST | |
Chevrolet Tahoe | 1996 | VPW J1850 | |
5.7, Gasoline (265HP) | 1998 | VPN | |
5.3, Gasoline (275HP) | 2001 | VPN | |
5.3 V8, Gasoline (290HP) | 2005 | VPN | |
Chevrolet Trailblazer | Gasoline (270 HP) | 2002 | PWM J1850 |
Gasoline (270 HP) | 2002 | ||
Chevrolet Trans Sport | Gasoline (184 HP) | 2000 | |
Gasoline (186 HP) | 2003 | ||
Chevrolet Transsport | Gasoline (184 HP) | 1997 | VPW J1850 |
Chevrolet Uplander | 3.9, Gasoline (200HP) | 2007 | CAN 11bit (500kb) |
3.9, Gasoline (250HP) | 2007 | CAN 11bit (500kb) | |
Chevrolet Venture | 1998 | VPW J1850 | |
3.4, Gasoline (160HP) | 2002 | VPN |
Some OBD-II cables schemes:
Do-it-yourself ECM/PCM Reprogramming (OBDI & II)
If you decide to get into programming foryourself, there are a few questions you need to ask yourself. First, youneed to ask yourself if you are planning on keeping your current powertrainconfiguration. If you don't plan on making any other changes to your vehicle, itwould probably be less expensive to let someone program your computer or chip. The obvious reason here is cost. Should you be one of those'hands-on' type of people, or your powertrain is constantly changingor being upgraded, then doing your own programming would probably be the least-expensive alternative. Below are a couple of links of good technical articles that explain the basics of tuning a vehicle computer as well as what special tools and equipment are required to do the job.
To reprogram most GM OBD-1 chips, you will require appropriate tuning software.
- http://tunercat.com/← The best (in my opinion)
You will also need an EPROM programmer and/or UV eraser
For those of you using the 94 and later LT1engines with the flashable PCMs, you will only require software from TunerCat orLT1edit as well as an interface cable. The 'ALDL' cables start at $50 oryou can build your own for less than $20.
NOTE: OBDII Vehicles are not currently supported byevery editor.
I use the one above personally andit works great on OBDI LT1, TBI, and TPI vehicles.
Most laptops running on battery powermay not have enoughinternal power for the adapter. Or the power supply may be too noisy forstable communications. I have found this to be the case with some PCs or laptops which is why I usethis design.
OBDII (1996-up)
There are quite few OBD-2 custom tuning software packages on the market, depending on what vehicle you have. Most of which can be found by a simple search on the internet.
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