OBD通讯协议

OBD

通讯协议

OBD-II Network Standards

? J1850 PW

–

Adopted by GM; also known as Class 2.

–

Adopted by Chrysler (known as J1850).

–

Some references to PW mode heard about in regards to Toyota (and Honda ?).

–

10.4 kbps, single wire.

? J1850 PWM

–

Adopted by Ford; also known as Standard Corporate Protocol (SCP).

–

Also seen in some Mazda products.

–

Some references to PWM mode heard about in regards to Mitsubishi.

–

41.6 kbps, two wire balanced signal.

? ISO 9141 and ISO 9141-2 (also known as ISO 9141 CARB)

–

Seen in some Chrysler and Mazda products.

–

Seems to be more common in Europe.

–

10.4 kbps, single wire.

OBDII

通讯协议

obdii generic communication protocols by manufacturer

Recently I tried to install my product on Peuzeot(406 or something

similar). There was

KWP 2000 bus. I tried to get the speed alue from the bus by sending

the following string

0xc2 0x33 0xf1 0x01 0x0d 0xf4.

On responce I receied two answers from 2 different ECUs:

1) 0x83 0xf1 0x10 0x7f 0x01 0x12 0x16

1) 0x83 0xf1 0xa4 0x41 0x0d 0x00 0x66

The first ECU sent me NACK

(This response code indicates that the requested action will not be

taken because the serer (ECU) does not support the arguments of the

request message or the format of the argument bytes do not match the

prescribed format for the specified serice.)

My question is: if there was something wrong with the arguments of the

request message, the second ECU also should not understand the

request, bit it did !

And the second question is: why the first ECU did send the negatie

answer. If you look at the j1979 PDF you will find there that

ECU does not support any of the PIDs requested it is not allowed to

send a negatie response message

OBD

信息：

我理解的

OBD- II

标准诊断插座列表

我理解的

obd- ii

标准诊断插座列表

端子号称

端子接线

--------------------------- ------------------------------------------

4

搭铁

16

蓄电池正极，

9-12

7

，

15

资料数据传输线（

iso 9141-2

）

5

信号反馈线搭铁

2

sae j1850

数据输送线

10

sae

制造厂数据输送线

举一实例；捷达前卫诊断座

t16

中；就有

16 4 7

三个端子按以上要求接线。

EOBD

欧洲标准

新的

european obd

诊断坐连接标准

dlc-j1962

======================================= ========================================

=

pin 1 ......sae j2411, gm single wire can;

通用公司单线

can-bus

pin 2 ......iso 11519-4 (bus+)(sae j1850),

和

10

号脚同时使用

, 41.6 kbps pwm

脉宽调制

单线用法

只用

2

号脚

根线通讯

10.4 kbps pw

可变脉宽调制

byte header + crc,

no

pin 3 ...... chrysler, ccd+ (not obd) ;

克莱斯勒

ccd- bus

网线

h

线

pin 4 ......

底盘地

chassis ground

pin 5 ......

逻辑地

signal ground

pin 6 ...... iso 15765-4;can-bus

高速诊断线

(h

线

) ,250/500 kbit/s

pin 7 ....... kwp1281

或

kwp2000

协议诊断线

(k

线

),

波特率

10400/

多数厂家默认

kp w2000

诊

断线

pin8 ........

点火开关打开有电

ig+;

点火开关

on/off

状态识别用途

pin9 ........ 7

号脚不方便用时

,

启用

*kwp1281

或

kwp2000

协议诊断线

(k

线

),

波特率

10400

pin10 ....... iso 11519-4 (bus-)(sae j1850),

和

2

号脚同时使用

, 41.6 kbps pwm

脉宽调制

pin 11 ...... chrysler, ccd- (not obd) ;

克莱斯勒

ccd- bus

网线

l

线

pin 12 ...... * k

线

制造厂保留用

pin 13 ...... * k

线

制造厂保留用

pin 14 ...... iso 15765-4;can-bus

高速诊断线

(l

线

) ,250/500 kbit/s

pin 15 ...... kwp1281

或

kwp2000

协议诊断线

(k

线

);7p

不够用或控制单元过多时启用

< br>

pin 16 ......

长火线

bat+

obdii

和

eobd

的基本区别