
If your diagnostic connector looks
like this one,then you have an OBDII
sytem,and it requires ascanner to
access the codes.Scanners can be
found from the links on the
homepage.All vehiclesafter 96 have
the OBDII systems and some 95 models,too.
Pin 2 – J1850 Bus+
Pin 4 – Chassis Ground
Pin 5 – Signal Ground
Pin 6 – CAN High (J-2284)
Pin 7 – ISO 9141-2 K Line
Pin 10 – J1850 Bus
Pin 14 – CAN Low (J-2284)
Pin 15 – ISO 9141-2 L Line
Pin 16 – Battery Power
Some 1995 GM vehicles have the 16-pin
connector but have accessible OBD-I
codes. Check theunderhood emissions
sticker to confirm, and if yours is OBD-I,
the codes are accessed bybridging
terminals 5 and 6. If your vehicle is
OBD-II, a scan tool or computer is
required toaccess the codes.
P 0 1 0 1
1 2 3 4 5
1st digit
P = powertrain
B = Body
C = Chassis
2nd digit
0 = Standard
1 = Manufacturer specific
3rd digit
1 = Emission management
2 = Injector circuit
3 = Ignition
4 = Auxiliary emission
5 = Vehicle speed & idle control
6 = Computer & output circuit
7 = Transmission