The pinout of the OBD 2 connector will allow the car owner to correctly connect the pins of the connector for diagnostics vehicle... A scanner or a personal computer (PC) is connected to this plug to check the car.
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Description and features of OBD 2
The OBD 2 vehicle diagnostic system includes the X1234 code structure as standard.
Each symbol here has its own meaning:
- X - the element is the only letter and allows you to find out the type of car malfunction. May not work correctly power unit, transmission, sensors, controllers, electronic modules, etc.
- 1 - generic OBD class code. Depending on the car, it is sometimes an additional manufacturer's code.
- 2 - using the symbol, the car owner will be able to clarify the location of the problem. For example, it can be an ignition system, battery power supply ( battery), additional power lines, etc.
- 3 and 4 - determine the serial number of the malfunction.
The main feature of the shoe is the presence of a power outlet from the car's mains, which allows the use of scanners that do not have built-in power lines. Initially, diagnostic protocols were used to obtain information about the appearance of problems in the operation of systems. Pads in modern cars allow consumers to get more information about errors. This is ensured by the connection of diagnostic scanners and devices with electronic modules in the machine.
Depending on the manufacturer of the adapter, the device may belong, for example, to the following international classes:
- SAE J1850;
- SAE J1962;
- ISO 9141-2.
The Mir Matiz channel spoke in detail about the purpose of diagnostic pads and their use.
Where is OBD 2 located?
The location of the OBD 2 pads is always indicated in the service manual, so it is better to clarify the moment in the documentation.
The different position of the diagnostic plug in the car is due to the fact that vehicle manufacturers do not use a single standard regarding the installation of pads. If the device is classified as J1962, then it must be installed within a radius of 18 cm from the steering column. Manufacturers do not actually follow this rule.
The location of the device can be as follows:
- In a special slot in the lower casing of the instrument cluster. It can be seen in the center console in the driver's left knee area.
- Under the ashtray, which is usually located in the center of the console and instrument cluster. At this point, the connector is often installed by French car manufacturers - Peugeot, Citroen, Renault.
- Under the plastic plugs located on the bottom of the instrument cluster. This is where the pads are usually installed by VAG- cars Audi, Volkswagen, etc.
- On the back of the center console, in the area where the glove compartment is installed. This location is typical for some VAZ vehicles.
- In the handle area hand brake, under the plastic of the center console. This situation is typical for Opel cars.
- At the bottom of the armrest niche.
- V engine compartment next to the engine shield. At this point, the connector is installed by Korean and Japanese manufacturers.
If the car has a solid mileage, then the installation location may be different. Sometimes when electrical faults or damaged circuits, car owners move the connector.
The user Ivan Matieshin, using the example of a Lada Granta car, showed where the OBD 2 diagnostic output is installed.
Connector types
In modern vehicles, two types of diagnostic pads can be used - classes A or B. Both connectors are equipped with 16-pin outputs, eight contacts in each row. Contact elements are numbered from left to right, respectively, at the top there are components numbered 1–8, and at the bottom - 9–16. The outer part of the body of the diagnostic block is made in the form of a trapezoid and is characterized by rounded shapes, which makes it possible to connect an adapter.
The main difference between different types connectors are located in the center of the guide grooves.
Photo gallery
Photos of potential locations diagnostic connectors:
Location of the connector in the "glove compartment" of the car Diagnostic outlet under the center console of the car The location of the shoe under the ashtray in the cabin
OBD 2 pinout
Connection diagram of contact elements to the diagnostic block:
- Backup contact. Depending on the manufacturer, any signal can be output to it. He is appointed by the auto developer.
- Pin K. Used to send various parameters to the control unit. In many cars it is designated as a J1850 tire.
- A backup contact that is assigned by the vehicle manufacturer.
- "Mass" of the diagnostic block connected to the vehicle body.
- "Ground" of the signal of the diagnostic adapter.
- Contact element for direct connection of digital CAN interface J2284.
- Contact for connecting channel K in accordance with the international standard ISO 9141-2.
- Reserved contact element, assigned by the vehicle manufacturer.
- Spare contact.
- Pin required to connect to a J1850 class bus.
- The purpose of this contact is determined by the machine manufacturer.
- Appointed by the auto developer.
- Reserve pin, assigned by the manufacturer.
- Additional contact element for connecting the digital CAN interface J2284.
- L-port pin for connection in accordance with ISO 9141-2.
- Positive contact for connecting the vehicle's mains voltage, rated for 12 volts.
As an example of the factory pinout of the pads, you can use the Hyundai Sonata car. In these models, the first contact of the connector is designed to receive signals from the control module. anti-lock braking system... Pin number 13 is used to read pulses from the ECU ( electronic unit control), as well as airbag controllers.
The types of pinouts can be different depending on the protocol class:
- If the ISO9141-2 standard is used in the car, then this protocol is activated by using contact 7. Pins under the second and tenth numbers are not used and are inactive. Contact elements 4, 5, 7 and 16 are used to send information. Depending on the vehicle, contact 15 can be used for this task.
- If the vehicle implements the SAE J1850 VPW protocol, then the second, fourth, fifth and sixteenth pins are used in the connector. Such pads are usually equipped with vehicles from General Motors of European and American production.
- It is possible to use the J1850 protocol in PWM mode. This application provides for the additional use of the tenth pin. This type of connector is installed on Ford vehicles. Regardless of the type of output, the seventh contact is not used.
Channel "MotorState" spoke in detail about the pinout of OBD 2 diagnostic connectors for cars.
Diagnostics via OBD 2
The verification procedure is as follows:
- Depending on the vehicle, the diagnostic process can be carried out with the ignition off or on. This point should be clarified in the service manual. Before starting, the ignition procedure in the car is turned off or on.
- A program is launched on the computer for verification.
- Connecting diagnostic equipment to the connector. If this is a scanner, then the block with the wire from it must be inserted into the plug. When using a PC, one end of the adapter plugs into the USB output of the computer and the other plugs into the connector.
- You need to wait until the program detects the block after synchronization. If this does not happen, you should go manually to the control menu and select the option to search for new devices.
- The diagnostic procedure starts on the computer. Depending on the software, the user may be able to select the desired verification tool. Some programs support separate diagnostics of the engine, transmission unit, power grid and other components.
- After completing the check procedure, fault codes will appear on the PC screen. These errors must be deciphered in order to accurately determine the type of breakdown. In accordance with the data received, the vehicle is being repaired.
Video "How to diagnose a car through OBD 2?"
The SUPER ALI channel showed the process of testing vehicle systems using a special scanner connected to the OBD 2 connector.
Everything modern cars, especially after 1996 release, include a universal protocol diagnostic system OBD- OBD-II. These devices can be built on the basis of a computer with an interface that connects to a 16-pin diagnostic connector. Diagnostics and self-tests in OBD 2 systems are carried out by a subroutine called Diagnostic Executive... The subroutine uses special monitors to control several different systems cars, the malfunction of which can lead to an increase in the toxicity of emissions. The subroutine runs in the background - while on-board computer not busy with basic management functions.
Error codes include categories:
"P" - is for powertrain codes; "B" - is for body codes;
"C" - is for chassis codes.
The category is indicated in the first position of the five-digit error code. The second position in this code speaks about the standard, where "0" is the common OBD-II code or "1" - if the manufacturer's code. The third position is the type of fault:
"1" and "2" - malfunctions in the fuel system or air supply;
"3" - problems in the ignition system;
"4" - for auxiliary emission control;
"5" - problems idle move;
"6" - malfunctions of the controller or its output circuits;
"7" and "8" - transmission malfunctions.
List of OBD error codes
P0 1XX FUEL AND AIR METERING Fuel and air metersPO 100 MAF or VAF CIRCUIT MALFUNCTION Malfunction of the air flow sensor circuit
PO 101 MAF or VAF CIRCUIT RANGE / PERF PROBLEM Signal out of range
PO 102 MAF or VAF CIRCUIT LOW INPUT Low level output signal
PO 103 MAF or VAF CIRCUIT HIGH INPUT High output level
PO 105 MAP / BARO CIRCUIT MALFUNCTION Air pressure sensor malfunction
PO 106 MAP / BARO CIRCUIT RANGE / PERF PROBLEM Signal out of range
PO 107 MAP / BARO CIRCUIT LOW INPUT Low output level
PO 108 MAP / BARO CIRCUIT HIGH INPUT High output level
PO 110 IAT CIRCUIT MALFUNCTION Intake air temperature sensor malfunction
PO 111 IAT RANGE / PERF PROBLEM Signal out of range
PO 112 IAT CIRCUIT LOW INPUT Low output level
PO 113 IAT CIRCUIT HIGH INPUT High output level
PO 115 ECT CIRCUIT MALFUNCTION Malfunction of coolant temperature sensor
PO 116 ECT RANGE / PERF PROBLEM Signal out of range
PO 117 ECT CIRCUIT LOW INPUT Low output level
PO 118 ECT CIRCUIT HIGH INPUT High output level
PO 120 TPS SENSOR A CIRCUIT MALFUNCTION Throttle Position Sensor Malfunction
PO 121 TPS SENSOR A RANGE / PERF PROBLEM Signal out of range
PO 122 TPS SENS A CIRCUIT LOW INPUT Low output level
PO 123 TPS SENS A CIRCUIT HIGH INPUT High output level
PO 125 LOW ECT FOR CLOSED LOOP FUEL CONTROL Low temperatures cooling liquid for closed loop control
PO 130 02 SENSOR B1 S1 MALFUNCTION O2 sensor B1 S1 is faulty (Bank1)
PO 131 02 SENSOR B1 S1 LOW VOLTAGE O2 sensor B1 S1 has a low signal level
PO 132 02 SENSOR B1 S1 HIGH VOLTAGE O2 sensor B1 S1 has a high signal level
PO 133 02 SENSOR B1 S1 SLOW RESPONSE O2 sensor B1 S1 has a slow response to enrichment / depletion
PO 134 02 SENSOR B1 S1 CIRCUIT INACTIVE O2 sensor circuit B1 S1 passive
PO 135 02 SENSOR B1 S1 HEATER MALFUNCTION O2 sensor heater B1 S1 faulty
PO 136 02 SENSOR B1 S2 MALFUNCTION O2 sensor B1 S2 defective
PO 137 02 SENSOR B1 S2 LOW VOLTAGE O2 sensor B1 S2 has a low signal level
PO 138 02 SENSOR B1 S2 HIGH VOLTAGE O2 sensor B1 S2 has a high signal level
PO 139 02 SENSOR B1 S2 SLOW RESPONSE O2 sensor B1 S2 has a slow response to enrichment / depletion
PO 140 02 SENSOR B1 S2 CIRCUIT INACTIVE O2 sensor circuit B1 S2 passive
PO 141 02 SENSOR B1 S2 HEATER MALFUNCTION O2 sensor heater B1 S2 defective
PO 142 02 SENSOR B1 S3 MALFUNCTION O2 sensor B1 S3 faulty
PO 143 02 SENSOR B1 S3 LOW VOLTAGE O2 sensor B1 S3 has a low signal level
PO 144 02 SENSOR B1 S3 HIGH VOLTAGE O2 sensor B1 S3 has a high signal level
PO 145 02 SENSOR B1 S3 SLOW RESPONSE O2 sensor B1 S3 has a slow response to enrichment / depletion
PO 146 02 SENSOR B1 S3 CIRCUIT INACTIVE O2 sensor circuit B1 S3 passive
PO 147 02 SENSOR B1 S3 HEATER MALFUNCTION O2 sensor heater B1 S3 faulty
PO 150 02 SENSOR B2 S1 CIRCUIT MALFUNCTION O2 sensor B2 S1 is faulty (Bank2)
PO 151 02 SENSOR B2 S1 CKT LOW VOLTAGE O2 sensor B2 S1 has a low signal level
PO 152 02 SENSOR B2 S1 CKT HIGH VOLTAGE O2 sensor B2 S1 has a high signal level
PO 153 02 SENSOR B2 S1 CKT SLOW RESPONSE O2 sensor B2 S1 has a slow response to enrichment / depletion
PO 154 02 SENSOR B2 S1 CIRCUIT INACTIVE O2 sensor circuit B2 S1 passive
PO 155 02 SENSOR B2 S1 HTR CKT MALFUNCTION O2 sensor heater B2 S1 faulty
PO 156 02 SENSOR B2 S2 CIRCUIT MALFUNCTION O2 sensor B2 S2 defective
PO 157 02 SENSOR B2 S2 CKT LOW VOLTAGE O2 sensor B2 S2 has a low signal level
PO 158 02 SENSOR B2 S2 CKT HIGH VOLTAGE O2 sensor B2 S2 has a high signal level
PO 159 02 SENSOR B2 S2 CKT SLOW RESPONSE O2 B2 S2 sensor has a slow enrichment / depletion response
PO 160 02 SENSOR B2 S2 CIRCUIT INACTIVE O2 sensor circuit B2 S2 passive
PO 161 02 SENSOR B2 S2 HTR CKT MALFUNCTION O2 sensor heater B2 S2 defective
PO 162 02 SENSOR B2 S3 CIRCUIT MALFUNCTION O2 sensor B2 S3 is faulty
PO 163 02 SENSOR B2 S3 CKT LOW VOLTAGE O2 sensor B2 S3 has a low signal level
PO 164 02 SENSOR B2 S3 CKT HIGH VOLTAGE O2 sensor B2 S3 has a high signal level
PO 165 02 SENSOR B2 S3 CKT SLOW RESPONSE O2 sensor B2 S3 has a slow response to enrichment / depletion
PO 166 02 SENSOR B2 S3 CIRCUIT INACTIVE O2 sensor circuit B2 S3 passive
PO 167 02 SENSOR B2 S3 HTR CKT MALFUNCTION O2 sensor heater B2 S3 faulty
PO 170 BANK 1 FUEL TRIM MALFUNCTION Fuel leak from fuel system block No. 1
PO 171 BANK 1 SYSTEM TOO LEAN Cylinder block # 1 is poor (possibly air leaks)
PO 172 BANK 1 SYSTEM TOO RICH Cylinder block # 1 is rich (possibly incomplete closing of the injector)
PO 173 BANK 2 FUEL TRIM MALFUNCTION Leakage of fuel from the fuel system of unit 2
PO 174 BANK 2 SYSTEM TOO LEAN Cylinder block # 2 is poor (possibly air leaks)
PO 175 BANK 2 SYSTEM TOO RICH Cylinder block # 2 is rich (possibly incomplete closing of the injector)
PO 176 FUEL COMPOSITION SENSOR MALFUNCTION Emission sensor CHx defective
PO 177 FUEL COMPOSITION SENS CKT RANGE / PERF Sensor signal out of range
PO 178 FUEL COMPOSITION LOW INPUT Low signal level of the CHx sensor
PO 179 FUEL COMPOSITION HIGH INPUT High signal level of the CHx sensor
PO 180 FUEL TEMP SENSOR A CIRCUIT MALFUNCTION Fuel temperature sensor circuit "A" is faulty
PO 181 FUEL TEMP SENSOR A CIRCUIT RANGE / PERF Sensor signal "A" is out of range
PO 182 FUEL TEMP SENSOR A LOW INPUT Low signal of the fuel temperature sensor "A"
PO 183 FUEL TEMP SENSOR A HIGH INPUT High signal of the fuel temperature sensor "A"
PO 185 FUEL TEMP SENSOR B CIRCUIT MALFUNCTION Fuel temperature sensor circuit "B" is faulty
PO 186 FUEL TEMP SENSOR RANGE / PERF Sensor signal "B" is out of range
PO 187 FUEL TEMP SENSOR B LOW INPUT Low signal of the fuel temperature sensor "B"
PO 188 FUEL TEMP SENSOR B HIGH INPUT High signal of the fuel temperature sensor "B"
PO 190 FUEL RAIL PRESSURE CIRCUIT MALFUNCTION The fuel rail pressure sensor circuit is faulty
PO 191 FUEL RAIL CIRCUIT RANGE / PERF Sensor signal out of range
PO 192 FUEL RAIL PRESSURE LOW INPUT Low fuel pressure sensor signal
PO 193 FUEL RAIL PRESSURE HIGH INPUT High fuel pressure sensor signal
PO 194 FUEL RAIL PRESSURE CKT INTERMITTENT Fuel pressure sensor signal intermittent
PO 195 ENGINE OIL TEMP SENSOR MALFUNCTION Engine oil temperature sensor circuit defective
PO 196 ENGINE OIL TEMP SENSOR RANGE / PERF Sensor signal out of range
PO 197 ENGINE OIL TEMP SENSOR LOW Low oil temperature sensor signal
PO 198 ENGINE OIL TEMP SENSOR HIGH High oil temperature sensor signal
PO 199 ENGINE OIL TEMP SENSOR INTERMITTENT Oil temperature sensor signal intermittent
PO 2XX FUEL AND AIR METERING
PO 200 INJECTOR CIRCUIT MALFUNCTION Injector control circuit defective
The rest of the trouble codes.
1 OEM
2 J1850 Bus + (Bus + Line, SAE)
3 OEM
4 Body ground
5 Signal ground
6 Upper CAN contact (J-2284)
7 K Line ISO 9141-2
8 OEM
9 OEM
10 Bus - Line, Sae J1850 Bus
11 OEM
12 OEM
13 OEM
14 Lower CAN contact (J-2284)
15 L Line ISO 9141-2
16 Battery voltage
Please note that the presence of the connector is not a 100% sign of compatibility with OBD 2. Cars equipped with this system must have a mark in the accompanying documentation. The most commonly used protocol can be identified by the presence of certain pins on the connector. OBD pinout and other connectors for different types cars can be downloaded in the collection or see here.
Currently great attention paid to cleanliness control environment... In this regard, the OBD technology appeared, designed to make an independent one. The article gives the concept, the history of creation, the OBD2 pinout is considered, the OBDII diagram is attached.
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OBD2 Review
Most modern cars installed (ECU), which collects and analyzes data on the operation of various vehicle systems.
Concept and features
The term OBD - On Board Diagnostic is a generic term that refers to self-diagnostics of a car. This technology provides information on the status of various systems. passenger car from the on-board computer.
At first, OBD only reported a malfunction, but no detailed information about its essence was given. V newest versions the system uses a standard digital connector, which allows you to receive information about the state of car systems in real time with the receipt of fault codes by which you can identify them. it a good device for reading errors and removing them.
An excursion into the history of creation
The history of OBD creation goes back to the 50s of the last century. The US government drew attention to the fact that the development of the automotive industry worsens the environment. The specification was developed by the Society of Automotive Engineers (SAE). At first, the OBDII diagnostic system controlled only the exhaust gas recirculation system, fuel supply, oxygen sensor, engine control unit regarding control over exhaust gases. There was no unified control system, each manufacturer installed its own system.
Since 1996, a second concept of the OBD2 standard has been developed in the USA, which has become mandatory for new cars.
OBD2 Purpose - Determine:
- type of diagnostic connector;
- pinout;
- electrical communication protocols;
- message format.
The European Union has adopted EOBD, which is based on OBD-II. It is mandatory for all cars from January 2001. OBD-2 supports 5 communication protocols.
Pinout features
The device for working with OBD is a diagnostic connector to which devices that control the composition are connected exhaust gases and the operation of the main systems of the vehicle. The OBD2 pinout is a list of requirements that car manufacturers must adhere to.
According to the requirements, the OBD diagnostic connector must be located at a distance of no more than 18 cm from the steering wheel. The system is universal and uses the standard digital CAN protocol. It makes it possible to get detailed information about car malfunctions.
OBD2 protocols provide the ability to read various parameters, the number of which depends on the control unit and may differ from different manufacturers (Black Mamba).
Basically about 20 parameters are supported.
With the OBD-II system, you can read:
- coolant temperature;
- in what mode the fuel system operates;
- correction of fuel supply for bank 1/2, both long-term and short-term;
- calculated engine load;
- engine speed;
- fuel pressure;
- ignition timing;
- vehicle speed;
- air flow;
- intake manifold pressure;
- throttle position;
- location of oxygen sensors and data from them;
- incoming air temperature, etc.
To control a specific auto system, 2-3 parameters are enough. But more may be required. The number of simultaneously monitored parameters and the format of data output depends on the scanning device, as well as on the speed of information exchange with the ECU.
The diagnostic connector has 16 pins - their pinout is as follows:
1 - installed at the manufacturing plant;
2 - connected to the J 1850 bus (J1850 Bus +);
3- installed by the manufacturer;
4- monitors the grounding contacts of the car (chassis) (Chassis Ground);
5 - to control the signal line grounding network (Signal Ground);
6 - associated with digital bus CAN (CAN High (J-2284));
7 - ISO 9141 - 2, K - Line;
8.9 - set by the car manufacturer;
10 - for monitoring the CANJ 1850 bus (J1850 Bus-);
11, 12, 13 - installed by the manufacturer;
14 - to control the CANJ 2284 bus (CAN Low (J-2284));
15 - ISO 9141-2, L - Line;
16 - to monitor the battery voltage (Battery Power).
Thanks to the pinout, the driver can combine his car with the OBD2 diagnostic block.
If it is found that the composition of the exhaust gases does not meet the requirements, the inscription CheckEngine will light up, requiring an engine check. The indicator warns that the quantity is exceeded harmful substances in waste gases.
OBD2 adapter
Every car must be equipped with an OBD2 diagnostic adapter.
It is convenient to use it for:
- diagnostics of vehicle systems;
- identification and analysis of errors;
- control of the operation of the power unit;
- control of voltage, speed, mileage, temperature;
- to track fuel consumption;
- monitoring the status of panel devices;
- mileage tracking, etc.
When choosing a scanner, you should be guided by its capabilities. expensive devices... If you cannot buy an expensive scanner, you should choose a scanning device made for this car brand.
OBD2 connector is used to connect the scanner to the ECU. Using the pinout, the scanner is connected to the vehicle's power supply and ground, which ensures it smooth operation... Thanks to the OBDII protocols, parameters that affect the air purity are monitored. This is environmental protection.
The presence of the OBD2 connector allows you to control the health of the car on your own, without resorting to expensive diagnostics.
The diagnostic connector is a standardized SAE J1962 trapezoidal connector with sixteen pins arranged in two rows).
According to the standard, the OBD2 connector must be located in the passenger compartment (most often located in the area of the steering column). The location of the OBD-1 connector is not strictly regulated and it can even be located in the engine compartment.
By the connector, you can determine which OBD2 protocols are supported in your car. Each protocol uses specific connector pins. This information will be useful to you when choosing an adapter.
Pinout (pin assignment) of OBD2 connector
| 1 | OEM (manufacturer's protocol). |
| 2 | Bus + (Bus positive Line). SAE-J1850 PWM, SAE-1850 VPW. |
| 3 | - |
| 4 | Grounding of the body (Chassis Ground). |
| 5 | Signal Ground. |
| 6 | High speed CAN-High line CAN bus Highspeed (ISO 15765-4, SAE-J2284). |
| 7 | K-Line (ISO 9141-2 and ISO 14230). |
| 8 | - |
| 9 | CAN-Low line, low-speed CAN Lowspeed bus. |
| 10 | Bus - (Bus negative Line). SAE-J1850 PWM, SAE-1850 VPW. |
| 11 | - |
| 12 | - |
| 13 | - |
| 14 | CAN-Low line of high-speed CAN Highspeed bus (ISO 15765-4, SAE-J2284). |
| 15 | L-Line (ISO 9141-2 and ISO 14230). |
| 16 | Power supply + 12V from the battery (Battery Power). |
Pins 3, 8, 11, 12, 13 are not defined by the standard.
Determine the OBD2 protocol used in the car
The standard regulates 5 protocols, but most often only one is used. The table will help you determine the protocol by the contacts used in the connector.
| Protocol | end 2 | end 6 | end 7 | end ten | end fourteen | end 15 |
|---|---|---|---|---|---|---|
| ISO 9141-2 | + | + | ||||
| ISO 14230 Keyword Protocol 2000 | + | + | ||||
| ISO 15765-4 CAN (Controller Area Network) | + | + | ||||
| SAE J1850 PWM | + | + | ||||
| SAE J1850 VPW | + |
In the PWM, VPW protocols there is no 7 (K-Line) pin, in ISO there is no 2 and / or 10 pin.
The modern car is full of various electronic systems, one of which is the onboard equipment diagnostics system. When building such a system, it uses the obd2 connector, standardized in 1996 and most often used to connect a scanner. It can also be used to analyze such current parameters as voltage, temperature, speed and the like, including directly during the current operation of the car.
Obd2 appearance
According to the requirements normative documents the obd2 connector socket is located in the passenger compartment next to the steering wheel (distance not less than 18 cm). Electrical characteristics connectors are sufficient for organizing information exchange using the digital industrial CAN bus ( maximum amount nodes - 32, maximum cable length - 35 m).
Connector design
The obd2 connector from a mechanical point of view implements a two-component unbalanced design and contains 16 pins, which are located in two rows. The numbering of contacts in the socket is made from left to right, with the upper row numbered from 1 to 8, and the lower row from 9 to 16. The plug and socket housings are made of plastic; to increase operational reliability, a thin separator plate is provided in the socket between the rows of contacts.
To automatically set the correct polarity when connecting, the plug and socket housings are trapezoidal in cross section with rounded corners.
The connector pins form two groups according to their purpose. The first of them is standardized; each manufacturer can use the contacts of the second group to solve their problems.
Numbering and pin assignment of obd2 connector
Pinout obd2 connector with an indication of the purpose of individual contacts is given in the table.
| 1 | Branded |
| 2 | J1850 bus |
| 3 | Branded |
| 4 | Grounding common |
| 5 | Signal ground |
| 6 | CAN bus |
| 7 | Line K according to ISO 9141-2 |
| 8 | Branded |
| 9 | Branded |
| 10 | J1850 bus |
| 11 | Branded |
| 12 | Branded |
| 13 | Branded |
| 14 | CAN bus |
| 15 | Line L according to ISO 9141-2 |
| 16 | +12 V |
Self-production of the connecting cable
Need self-made or repair of the connecting cable can occur when the diagnostic tool is connected to the vehicle's on-board computer network. For this, the data given in the table are used. The wires of the cable are connected to the contacts of the plug and socket by soldering in compliance with the usual rules in such cases. After soldering, the contact can be additionally protected with a short cambric.
