OBD-II


OBD-II car connector

PinSignalDescription
1-
2J1850 Bus+Bus positive Line of SAE-J1850
3-
4Chassis Ground
5Signal Ground
6CAN High (J-2284)CAN high (ISO 15765-4 and J2234)
7ISO 9141-2 K LineK line of ISO 9141-2 and ISO 14230-4
8-
9-Tachometer signal on some cars like Toyota
10J1850 Bus-Bus negative Line of J1850
11-
12-
13-
14CAN Low (J-2284)CAN low (ISO 15765-4 AND J2234)
15ISO 9141-2 L LineL line of ISO 9141-2 and ISO 14230-4
16Battery Power

The location of the OBD II socket is generally on the driver's side of the car under the steering wheel.

The unspecified pins are left for car manufactures use. They can differ depending on the car manufacture and model.

OBD-II to DE9 Cable

DE-9OBD-IISignal
15Signal Ground
24Chassis Ground
36CAN High (J-2284)
47ISO 9141-2 K Line
514CAN Low (J-2284)
610J1850 Bus-
72J1850 Bus+
815ISO 9141-2 L Line
916Battery Power
Note: This cable is not meant to be plugged directly into a computer's serial port. It is meant to plug into some sort of hardware interface.

OBD-II to DE15 Cable

DE-15SOBD-IISignal
11
22J1850 Bus+
33
44Chassis Ground
55Signal ground
66
77ISO 9141-2 K Line
88
99
1010J1850 Bus-
1111
1212
1316Battery Power
1414
1515ISO 9141-2 L Line
Outer shield is tied to pin 4

OBD II Standard Fault Codes

P00xx Fuel and Air Metering
P01xx Fuel and Air Metering
P02xx Fuel and Air Metering
P03xx Ignition System and Misfire Detection
P04xx Auxilliary Emission Controls. EGR, EVAP etc.
P05xx Vehicle Speed, Idle Control, and Auxiliary Inputs
P06xx Computer and Auxiliary Outputs
P07xx Transmission