'OBD2' 태그의 글 목록 (2 Page)

How do I know whether my car is OBD-II compliant?

| Car 2008. 11. 10. 11:20

Posted by cloudmir

자신의 차량이 OBD 규격을 지원하는지는 다음과 같이 확인할 수 있다.

There are several ways.

1996 or newer model year vehicle sold in the United States

United States legislation requires all cars and light trucks model year (MY) 1996 and newer to be OBD-II compliant. More information is available on the EPA's website.

2001 or newer model year gasoline vehicle sold in the European Union

Commission Directive 70/220/EEC, Annex I:

8.1. Vehicles with positive-ignition engines
With effect from 1 January 2000 for new types and from 1 January 2001 for all types, vehicles of category M1, except vehicles the maximum mass of which exceeds 2500 kg, and vehicles of category N1 class I, must be fitted with an on-board diagnostic (OBD) system for emission control in accordance with Annex XI. [...]

Note that here "European Union" means countries which were members of the EU in 2000.

2004 or newer model year diesel vehicle sold in the European Union

Commission Directive 70/220/EEC, Annex I:

8.2. Vehicles with compression-ignition engines
Vehicles of category M1, except
- vehicles designed to carry more than six occupants including the driver,
- vehicles whose maximum mass exceeds 2500 kg,
from 1 January 2003 for new types and from 1 January 2004 for all types, must be fitted with an on-board diagnostic (OBD) system for emission control in accordance with Annex XI.

Note that here "European Union" means countries which were members of the EU in 2003.

Other vehicles

If your vehicle does not fall into any of the above categories, look under the hood and try to locate a label (Fig. 1) that explicitly states that the vehicle was designed to comply with OBD-II legislation.

Fig. 1 - Vehicle Emission Control Information Label

In this case, OBD-II is used as a general term and can mean any of the following:

OBD II (California ARB)
EOBD (European OBD)
JOBD (Japanese OBD)

You may also consult your vehicle's owner's manual and perhaps contact your local dealer. However, be aware of the fact that many dealers do not know the difference between OBD and OBD-II.

If the vehicle is not OBD-II compliant, you cannot use a generic OBD-II scan tool such as ElmScan to obtain diagnostic information from your vehicle.

But my car has the 16-pin OBD connector, shouldn't it be OBD-II compliant?

No, not necessarily. A lot of European and Asian manufacturers equipped their vehicles with D-shaped 16-pin connectors long before they began installing OBD-II systems on those vehicles. One curious thing to note here is the fact that most non-EOBD compliant vehicles had a DLC that does not fully conform to SAE J1979. Compare figures 2 and 3, and notice the "ears" on the non-EOBD compliant Ford Focus.

Fig. 2 - Ford Escort DLC (courtesy of DigitalFriction, UK)

Fig. 3 - J1962 Vehicle Connector, Type A

LINK : http://www.scantool.net/support/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=2&nav=0

And

Which OBD-II protocol is supported by my vehicle?

| Car 2008. 11. 10. 11:17

Posted by cloudmir

All cars and light trucks built for sale in the United States after 1996 are required to be OBD-II compliant. The European Union OBD legislation is somewhat more complicated.

An OBD-II compliant vehicle can use any of the five communication protocols: J1850 PWM, J1850 VPW, ISO9141-2, ISO14230-4 (also known as Keyword Protocol 2000), and more recently, ISO15765-4/SAE J2480 (a "flavor" of CAN). US car manufacturers were not allowed to use CAN until model year 2003, and as of this writing (June 2005) ScanTool.net, LLC is working on a CAN-compatible interface.

There are two types of diagnostic link connectors (DLCs) defined by SAE J1962 - Type A and Type B, shown in Figures 2 and 3, respectively. The main difference between the two connectors is in the shape of the alignment tab.

Location - According to J1962, Type A DLC "shall be located in the passenger or driver's compartment in the area bounded by the driver's end of the instrument panel to 300 mm (~1 ft) beyond the vehicle centerline, attached to the instrument panel and easy to access from the driver's seat. The preferred location is between the steering column and the vehicle centerline."

Fig. 1 - J1962 Vehicle Connector, Type A

Type B DLC "shall be located in the passenger or driver's compartment in the area bounded by the driver's end of the instrument panel, including the outer side, and an imagined line 750 mm (~2.5 ft) beyond the vehicle centerline. It shall be attached to the instrument panel and easy to access from the driver's seat or from the Co-drivers seat or from the outside. The vehicle connector shall be mounted to facilitate mating and unmating."

Fig. 2 - J1962 Vehicle Connector, Type B

As a general rule, you can determine which protocol your vehicle is using by looking at the pinout of the DLC:

Fig. 3

The following table explains how to determine the protocol:

Pin 2	Pin 6	Pin 7	Pin 10	Pin 14	Pin 15	Standard
must have	-	-	must have	-	-	J1850 PWM
must have	-	-	-	-	-	J1850 VPW
-	-	must have	-	-	may have*	ISO9141/14230
-	must have	-	-	must have	-	ISO15765 (CAN)

*Pin 15 (also called the "L-line") is optional in newer vehicles that use the ISO9141-2 or ISO14230-4 protocols.

In addition to pins 2, 7, 10, and 15, the connector should have pins 4 (Chassis Ground), 5 (Signal Ground), and 16 (Battery Positive). This means that:

PWM The connector must have pins 2, 4, 5, 10, and 16

VPW The connector must have pins 2, 4, 5, and 16, but not 10.

ISO The connector must have pins 4, 5, 7, and 16. Pin 15 may or may not be present.

CAN The connector must have pins 4, 5, 6, 14, and 16.

For your convenience, we've also compiled a list of confirmed OBD-II compliant vehicles and their respective OBD protocols, compiled from reports of our existing customers.

And lastly, you may find this page helpful:

OBDII Generic Communication Protocols by Manufacturer

LINK : http://www.scantool.net/support/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=3

And

USB OBD2 AllPro adapter

| Car/Engine 2008. 10. 8. 13:06

Posted by cloudmir

USB OBD2 AllPro adapter

Project Overview

This project is an extension of my USB OBD2 adapter with the support of all OBD2 protocols including CAN. It is compatible with ELM327.

Hardware

Here is the issue - you need both CAN and USB in one chip. Microchip got a bunch of PIC18 processors with CAN functionality, for instance PIC18F2480 or PIC18F2580. But you are out of luck if trying to find the device supporting both CAN and USB. In this case Microchip has another solution - use the standalone CAN controller MCP2515 and interfacing with the main controller thru SPI bus. That is how AllPro adapter supporting CAN protocol. The schematic is shown in Figure 5. As with the previous version of adapter the ISO9141/14230 interface is implemented on MC33290, the J1850 VPW bus is controlled by MC33390 transceiver and the pair of P-channel and N-channel MOSFETs (Q1, Q2) is driving PWM bus and PIC18F2455 internal comparator together with resistors R4, R5 producing the differential PWM input. The sircuit is powered from USB bus. Transistor Q3 is for legacy L-line initialization in ISO9141 protocol. I do not think that any car sold in US was ever using it but the specs says it might :) The firmware is available for download as well.

The OBD2 Cable for AllPro adapter

The adapter uses 9 pin D type female connector to link up to vehicle’s OBD2 J1962 connector. The pinout was chosen to match many of the commercially available cables. The pin connections required of the cable are as follows:

J1962 Pin	Description	DB9F Pin
2	J1850 Bus +	7
5	Signal Ground	1
6	CAN High	3
7	K Line	4
10	J1850 Bus -	6
14	CAN Low	5
15	L Line	8
16	Vehicle Battery Positive	9

You can build the cable yourself as Mouser Electronics started selling J1962 OBD2 connectors made by Delphi.

Note, that it is just connector block, no shell provided and you have to ordered the connector pins separately, see the parts reference table below.

Description	Mouser #
J1962 connector	829-12110252
J1962 connector male pins	829-12047581
DB9 female connector	156-1309-E
DB9 connector shell	156-2009-E

Connecting and Testing

There is no driver required for Microsoft Windows XP/2000/Vista as the adapter using the standard Communication Device Class (CDC) driver usbser.sys included in the distribution. However, Windows doesn’t have a standard INF file for the CDC driver. You can download the info file here. Plug the adapter to a spare USB port on your PC. Windows Found New Hardware Wizard will launch. Skip the Windows Update screen and go to install screen. Select "Install from a list or specific location (Advanced)" as shown below and then click "Next". Select the OBD Adapter INF file and configure the driver.

Open the Device Manager and select "Ports (COM and LPT)", the device appears as a
"Communication Port". Go to "Port Settings" tab and "Advanced" button. Select the port number you want to use.

Microsoft has a tool for examining the USB connections. USBView.exe is a freeware utility available for download, shows the USB connections tree and displays the details of USB devices connected to it, see the result below:

The Software

Here is the list the software I have tested so far with adapter:

Note that the free versions of ScanMaster and EeasyObdII are not supporting CAN protocol, apparently the authors are reluctant to keep them up-to-date. Here are the screenshots of ScanMaster-ELM:

Adapter PCB

The layout in Gerber format available for download here. The board was designed to fit SERPAC A20 enclosure available from Mouser as 635-A-20-A part or from DigiKey as SRA20A-ND. You can use freeware GerbMagic to view the gerbers.

Adapter Kit

I can sell the Adapter blank PCB for $6 plush S/H or a kit that included the board, preprogrammed PIC chip and all the components required for $45 + S/H. The kit doesn't include the OBD2 cable. The assembled adapters available as well...

Parts List

I have compiled the parts list for the most of popular electronic components vendors. PIC18F2455, MCP2515 and MCP2551 are available from Microchip Direct. MC33290 and MC33390 available from from Freescale as part of free sample program as MCZ33290 and MCZ33390 modifications.

Part	Description	Jameco #	Mouser #	DigiKey #
J1	USB type B connector	841053	806-KUSBX-BS1N-W	609-1039-ND
J2	DB-9M connector	104943	152-3309	A35113-ND
Q1,Q3	2N7000 transistor	783594	512-2N7000	2N7000FS-ND
Q2	BS250 transistor	256057	TP0610KL-TR1-E3	BS250KL-TR1-E3CT-ND
IC1	PIC18F2455		579-PIC18F2455-I/SP	PIC18F2455-I/SP
IC2	MCZ33290			MCZ33290EFR2CT
IC3	MCZ33390			MCZ33390EF-ND
IC4	MCP2551/PCA82C250	699780	579-MCP2551-I/P	MCP2551-I/P-ND
IC5	MCP2515		579-MCP2515-I/P	MCP2515-I/P-ND
X1	Crystal, 16.000Mhz	325139	815-ABL-16-B2	X077-ND
X2	Crystal, 20.000Mhz	325067	815-ABL-20-B2	X062-ND
D1	Blue 5mm LED		78-TLHB5400	67-1751-ND
D2	Yellow 5mm LED		78-TLHY5400	516-1331-ND
D3	Red 5mm LED		78-TLHR5400	516-1328-ND
D4,D5	1N4148 diode	36038	512-1N4148	1N4148DICT-ND
R1,R4,R5,R8	10K Ohm	691104	291-10K-RC	10KQBK-ND
R2,R3	330 Ohm	690742	291-330-RC	330QBK-ND
R6,R7	22K Ohm	691180	291-22K-RC	22KQBK-ND
R9,R10	510 Ohm	690793	291-510-RC	510QBK-ND
R11,R12	100 Ohm	690620	291-100-RC	100QBK-ND
C1,C2,C4,C5	15pF		140-50N2-150J-RC	490-3691-ND
C3,C8,C9	0.1uF	25523	581-BQ014D0104K	478-3383-ND
C6	0.47uF	25558	581-BQ074D0474K	478-3415-ND
C10,C11	560pF	332419	80-C315C561K2R	BC1022CT-ND
C7	10uF 16V	198838	647-UVR1V100MDD1TA	493-1036-ND
	28 pin socket for IC1	526248	571-3902619	3M5480-ND

Assembling Kit Notes

See assembling notes here

Schematic without MC33290 and MC33390

This is another proof on concept. Some folks are having problem obtaining MC33290 and 33390 chips. In this case you can bring into play the schematic shown in Figure 6. It is using SN75452 and 75453 drivers instead. Note, that it is not the better solution but rather workaround and using Freescale’s dedicated bus drivers is preferable.

And

PWM	The connector must have pins 2, 4, 5, 10, and 16
VPW	The connector must have pins 2, 4, 5, and 16, but not 10.
ISO	The connector must have pins 4, 5, 7, and 16. Pin 15 may or may not be present.
CAN	The connector must have pins 4, 5, 6, 14, and 16.

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'OBD2'에 해당되는 글 14건

1996 or newer model year vehicle sold in the United States

2001 or newer model year gasoline vehicle sold in the European Union

2004 or newer model year diesel vehicle sold in the European Union

Other vehicles

But my car has the 16-pin OBD connector, shouldn't it be OBD-II compliant?

USB OBD2 AllPro adapter

The OBD2 Cable for AllPro adapter

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