|
Where is the connector?
The
EOBD connector is required by the Directive to be located within the
passenger compartment of the car, within reach of the driver's seat.
Tools should not be required to reveal the connector, but it may have
a removeable cover over it.
What
does the connector look like?
The connector
has the following shape:
Which
pins contacts should be present on the connector?
Different
pins on the connector are used by different manufacturers. There are
5 pinout combinations within the standard, each of which uses a specific
communications protocol. These are listed below:
|
Protocol
|
Connector
pins used |
|
J1850
VPW
|
2,
4, 5, and 16, but not 10 |
|
ISO
9141-2
|
4,
5, 7, 15 (see below) and 16 |
|
J1850
PWM
|
2,
4, 5, 10 and 16 |
|
KWP2000
(ISO 14230)
|
4,
5, 7, 15 (see below) and 16 |
|
CAN
(Controller Area Network)
|
4,
5, 6, 14 and 16 |
Note:
For ISO/KWP2000 communications, pin 15 (L-line) is not always
required. Pin 15 was used on earlier ISO/KWP2000 cars to "wake-up"
the ECU before communication could begin on pin 7 (K-Line). Later cars
tend to communicate using only pin 7 (K-Line).
Rover
and MG cars: We have noticed that many Rover and MG models
do not have pin 5 (Signal Ground). This can prevent some diagnostic
tools from 'powering up' where they use pin 5 as the ground for the
circuitry.
What
are each of the pins used for?
The pins
are used as follows:
|
Pin
|
Use |
|
2
|
J1850
Bus+ |
|
4
|
Chassis
Ground |
|
5
|
Signal
Ground |
|
6
|
CAN
High (J-2284) |
|
7
|
ISO
9141-2 K Line and ISO/DIS 14230-4 |
|
10
|
J1850
Bus |
|
14
|
CAN
Low (J-2284) |
|
15
|
ISO
9141-2 L Line and ISO/DIS 14230-4 |
|
16
|
Battery
power |
Additional
pins may be wired on your car - these may be used by manufacturers for
other purposes.
Which
protocol is used by each manufacturer?
As a rough
guide, the protocols are generally found on cars from the following
manufacturers:
|
Protocol
|
Manufacturers |
|
J1850
VPW
|
General
Motors, Chrysler
|
|
J1850
PWM
|
Ford
models to 2003 with EEC-V engine management system, this includes:
Ford Cougar (all UK models), Ford Puma (1.6 and 1.7),
Ford Fiesta Zetec models to 2003, Ford Mondeo Zetec
models to 2003, Ford Focus to 2003
(and some of the newer Ford-based Jaguars, e.g. S-Type)
|
|
ISO
/ KWP
|
Most
European and Asian manufacturers, e.g.
Alfa Romeo, Audi, BMW, Citroen, Fiat, Honda, Hyundai, Jaguar (X300,
XK series and X-Type), Jeep, Kia, Land Rover, Mazda, Mercedes, Mitsubishi,
Nissan, Peugeot, Renault, Saab, Skoda, Subaru, Toyota, Vauxhall, Volkswagen
(VW), Volvo
|
|
CAN
|
Ford
2004+ Fiesta, Fusion, Mondeo, Focus models
Mazda RX-8
Vauxhall Vectra 2003+ model
Most
new models from approx. 2004 - CAN must be used for EOBD engine
diagnostics by all manufacturers by 2008
|
|
