Toyota. Description of the vehicle self-diagnosis system

OBD connectors. Pinout of ALL OBD Car diagnostic connectors by brand - video on the site

Good day, friends! I think that everyone has a question about diagnostics, someone goes to specialists in the hope that they will immediately be told why the consumption is so high or why the car stalls when accelerating, or, even worse, why there is vibration at idle. But this is often a myth. Especially with OBD, firstly, reading the data from the so-called logs is not accessible to everyone, and not everyone can decipher and understand what is hidden in all these graphs.

So, all Carina E and indeed Toyotas up to G had an OBD diagnostic connector, with its help you can carry out self-diagnosis of the system and connect a PC to read logs with a homemade cord, and a special program for the development of which thanks to the respected developer with the nickname chem This is an invaluable contribution to the diagnosis of our Toyota!

Engine self-diagnosis, or more correctly, reading errors from the ECU. By closing contacts E1 - Te1. And when you turn on the ignition, watch for the blinking of the Chekichan lamp. Reading ABS errors 3. If you have a diagnostic cable, use Te2 - Te1 - E1. Jumper the “TC” and “E1” terminals of the DLC1 connector. Remove the jumper from the “WA” and “WB” terminals.

After 4 seconds, read the code by the number of flashes of the ABS indicator. Remove the jumper from the “TC” and “E1” terminals. Place a jumper on terminals “WA” and “WB”. Resetting ABS codes Turn the ignition on. Jumper terminals "TC" and "E1" Press the brake pedal eight or more times in an interval of three seconds.

The indicator should display the norm code and flash 2 times per second. Make sure the ABS light goes off. This connector is often neglected during a swap, and if it is not on the motor braid, then it is not installed. But after replacing the engine, I like to start it with half a push, and this is easier to do when there are no errors before starting and gasoline has been pumped through the system.

Those who have a 3S-GTE know that it is very cramped under the hood, and without this box there are enough additional pendants - a fuel pump resistor, a fuel pump relay, an absorber electro-pneumatic valve and all of them from the side where the wiring enters the cabin. I got out of the situation in this way, it seems to me quite functional and at least collective farm.

OBDII OBD2 is an interesting topic for many people, and again very often it is neglected during a swap. In the best case, leaving one wire coming from the ECU, shorting it to ground, the ECU goes into self-diagnosis mode with a check lamp. And they can be understood, I myself neglected it, because the connector itself was not at hand. Let me make a reservation right away that diagnostics via OBDII is only possible if the ECU supports it. Using the 3SGTE pinout as an example, I’ll show you how I connected it; I’m sure that the contacts on other ECUs will be the same.

This alone is enough for self-diagnosis. TAC - Tachometer SIL - K-Line CG Data Bus - Ground. But when installing the heater motor protection, the mounting holes were occupied. And I had to think something. And it’s strange that before that the idea of ​​​​placing it in the glove compartment, or rather behind the glove compartment, did not occur to me. Right on the stiffening pipe. Is it really necessary to connect the TAC and TC pins in OBD2? It seems that people only connect 3 wires, plus minus and sil, and everything should show.

These wires are for displaying tachometer readings. And the vehicle for output to self-diagnosis. If so, then most likely the coil brain will not understand the distributor engine right away, without modifications. And the connector itself can be “wrapped with electrical tape.” That is, without replacing the torpedo wiring. Mitsubishi Lancer "Stealth F". Audi Q7 Antares Widebody R BMW X6 50i Reference. BMW 5 series project E34Coupe Fastback.

Conclusions of the Electronic Control Unit (ECU)

Complete Toyota box identification consists of a two-part alphanumeric designation Examples A240E -04A A245E -05A A241H -05A C56 -15A C50F 642 C50 -08A C51 -01A C52 -642 E55F5 824 E56F2 08B G52 A04A A540H 09B

More precisely, this is a complete identification of not the gearbox, but the entire transmission, shown on the engine compartment plate in the TRANS/AXLE line. Actually, the first part of the code is TRANS, i.e. transmission (read gearbox + gears + drive), and the second part of AXLE i.e. description of the differential and the main pair.

The first part of the code is TRANS

The first part of the code consists of 3-6 characters, starting with a letter, describes the gearbox itself, i.e. housing, shafts, etc. (not including the differential) let's decipher:

1. The first letter or letter and number is the box series code or development number - “C”, “C1”, “A”, “A1”, “A2”, “E”, etc. Example: A132L and A240L gearboxes are fundamentally different gearboxes in design (usually differing in housing), although they could be installed on the same type of engine, in the same body. the same goes for boxes C50 and C150 - they are completely different inside, box C56 is the “C” series (or, if you prefer, C0), and box C160 is the “C1” series (from the same series as C150, C153, C140 , S155 on the Tertselov family)

2. The number after the series code is the number of gears in the box. Example - A132L - 3 speed, A240L - 4 speed, C140 - 4 speed, C52 - 5 speed, C160 - 6 speed

3. The number designates the “gearbox row” - i.e. Transmissions that have different codes in this position have different gear ratios for some gears, compared to the basic set (basic - symbol 0 - zero). Examples for boxes C50, C51, C52, C56, C57, C58 are given above. This also applies to the C240L, C245E and C246E automatic machines, which differ in a number of gearboxes.

4. One or two characters (a letter, two letters, a letter with a number), or may be absent altogether - box subtype modifiers. Here, unfortunately, I do not have a detailed table; moreover, the modifiers for automatic and manual transmissions are different, and perhaps even depend on the type of box. But I will give the most common notations

— L — Lock-up torque converter — presence of OverDrive-controlled transmission and torque converter locking (automatic transmission) — E — Electronic control — electronically controlled gearbox (automatic transmission) — H — AWD Transverse mount engine — all-wheel drive transmission with hydromechanical locking of the center differential — F — Four wheel drive - all-wheel drive gearbox with viscous-type interaxle locking (V-Flex, Visc systems) additionally there may be numbers F5 - all-wheel drive with selectable part-time function F2 - - D - gearbox option for DIESEL (there, for example, there may be the starter on the other side, or the automatic transmission is designed to shift at other speeds or even strengthened)

The second part of the code is AXLE

The first symbol: ring gear diameter (for rear- and all-wheel drive) is the diameter of the main pair gear in the gearbox/axles (or the diameter of the planetary gear at the exit from the box, I misunderstood something). Please note that the “-” symbol is not just a “dash” between the TRANS and AXLE codes, it is an independent symbol that indicates the ABSENCE of the described parameter.

- no ring gear = i.e. for front-wheel drive FWD, this parameter does not make sense due to its absence; it may also be absent on 4WD gearboxes in initially front-wheel drive cars, due to the different implementation of power take-off to the rear axle, often, when describing contract gearboxes, this symbol is simply omitted

A 138mm B 145mm C 6.25″ D 6.62″ E 7.1″ F 7.5″ G 8″ H 9″ J 9.25″ K 9.5″ L 10.5″ M 12.5″ N 13.5″ P 14″ Q 12″ R 162mm S 6.38″ T 6.7 ″ U ​​6″ V 10.6″ W 15.5″ X 142mm Y 158mm Z 202mm

Second and third digits: MAIN PAIR This table is correct, but may not be complete, please note that some codes have two options. (and specifically, I fell into a stupor when punching the C56 -15A box from Black, because the table shows GP = 5.125)

01 3.30 02 3.36 03 3.545 04 3.556 05 3.70 06 3.889 07 3.90 08 4.111 09 4.222 10 4.375 11 4.444 12 4.625 13 4.79 14 4.875 15 5.125 16 5.286 17 5.60 18 5.714 19 5.833 20 6.167 21 6.667 22 6.78 23 6.833 24 7.64 25 4.556 26 5.571 27 3.364 28 4.30 29 4.10 30 3.727 31 3.909 32 6.591 or 4.807 33 7.503 or 5.583 34 6.781 or 4.786 35 7.636 or 5.60 36 4.778 37 3.583 38 3.417 39 3.154 40 5.375 41 3.308 42 6.500 43 3.550 44 3.214 45 3.533 46 2.928 47 3.944 48 3.356 49 3.729 50 3.400 51 3.736 52 3.722 53 3.250 54 3.941 55 3.333 56 2.821 57 4.058 58 3.238 59 3.234 60 3.5 19 61 2.724 62 2.892 63 2.655 64 4.312 65 3.837 66 3.071 67 3.526 68 3.095 69 4.176 70 5.857 71 2.962 72 3.949 73 4.285

Toyota car models produced in 1988-1996

These vehicles are starting to install multi-pin connectors. You can see their varieties below in the table.

In our article we will talk about the third type of connector, perhaps the most common connector, in Toyota cars of the late 90s - early 2000s. Although the information below on reading self-diagnosis codes and decoding them is also suitable for other types of connectors.

2.1 Toyota 22-pin diagnostic connector

2.2 Connector pinout

1. pin — [ FP
   ] Voltage control at the fuel pump. Or a terminal for supplying voltage to the fuel pump when checking the pressure in the fuel system
2. pin - [ W
   ] Used to read engine self-diagnosis codes (
   Check Engine
   )
3. pin - [ E1
   ] Mass. Used to read self-diagnosis codes
4. pin - [ OX1
   ] Monitoring the output voltage of the first lambda probe
5. pin - [ AB
   
   SRS fault codes
6. pin - [ OP1
   for reading immobilizer self-diagnosis codes)
7. pin - [ CC0
   ] Used to diagnose the first lambda probe. On some vehicles this contact is used to monitor the output voltage of the exhaust gas temperature sensor
8. pin - [ TE1
   ] Output for reading
   EFI
   .
   Diagnostics: “Normal Mode”
   .
   Used to read engine self-diagnosis codes (to read self-diagnosis codes, close to contact E1
   )
9. pin — [ TE2
   ] Diagnostics:
   “Test
   mode”.
   Used to read engine self-diagnosis codes (to read self-diagnosis codes, close to contact E1
   )
10. pin - [ CC2
    ] Used to diagnose the second lambda probe
11. pin - [ TC
    ] Used to read self-diagnosis codes of additional systems -
    ABS, Cruise Control, Traction Control System, Active Height Control, 4WS, SRS
    and others (to read self-diagnosis codes, short to pin
    E1
    )
12. pin - [ +B
    ] Power.
    +12V appears when the ignition is turned on (the “ON”
    of the ignition switch)
13. pin - [ VF1
    ] Contact, the voltage on which is the result of a computer analysis of the state and performance of the first lambda probe, as well as to indicate the mode in which the injection system is located.
    Sometimes the output voltage is output to pin CC0
    - 7 pin
14. pin - [ VF2
    ] Contact, the voltage on which is the result of a computer analysis of the state and performance of the second lambda probe, as well as to indicate the mode in which the injection system is located.
15. pin - [ OX2
    ] Monitoring the output voltage of the second lambda probe
16. pin - [ TS
    ] Used to read self-diagnosis codes of
    ABS
    and
    Traction Control System
    (to read self-diagnosis codes, short to pin
    E1
    )
17. pin - [ TT
    ] Used to read automatic transmission self-diagnosis codes (to read self-diagnosis codes, short to pin
    E1
    )
18. pin — [ OP4
    ] Optional contact. On different car models, its purpose may vary
19. pin - [ IG-
    ] Switch output. Tachometer signal
20. pin — [ OP2
    ] Optional contact.
    On different car models, its purpose may vary (for example, K-line
    diagnostics)
21. pin — [ OP3
    ] Optional contact.
    On different car models, its purpose may vary (for example, L-line
    diagnostics)
22. pin - [ WA
    ]
23. pin - [ WB
    ]

2.3 Reading engine self-diagnosis codes “Normal Mode”

1. Connect the jumper to pins TE1 and E1 of the diagnostic connector.
2. Turn on the ignition by setting the ignition switch to the “ON” position and read the fault codes by flashing the “CHECK ENGINE” indicator.

• The fault code consists of two digits. The first digit is determined by the initial series of flashes, then after a pause of 1.5 seconds, a second series of flashes follows, which corresponds to the second digit of the code.
• If there are two or more fault codes, the smallest code will be displayed first, followed by the remaining codes in ascending order. There will be a 2.5 second pause between codes.
• After all codes have been displayed, there will be a pause of 4.5 seconds, and then all codes will be repeated again.

Toyota DIAGNOSIS connector information

The Toyota injection system before 98 has a diagnostic connector DLC1. It is usually located under the hood on the left and is a box with the inscription “DIAGNOSIS”.

E1

This is "mass". Earth.

B+

"Plus" batteries. Appears when the ignition is turned on.

IGN-

The switch output is for an external tachometer.

TE1

Self-diagnosis

Diagnostic connector for models up to 90g.

Diagnostic connector for models produced after 90.

What can you check using the diagnostic connector? Much: Electronic engine control system Electronic automatic transmission control system ABS system TRC system SRS system (airbags) TEMS system (electronic shock absorber control) To do this, you just need to know how to correctly bridge certain contacts on the diagnostic connector: To check the engine - terminals “E1- Te1" To check the automatic transmission - conclusions "E1-TT" To check the ABS and TRC system - conclusions "E1-Tc" We will not go into details - “how and what happens inside the computer” when certain contacts are bridged, because this is quite complex process, but we don’t need it. There is a peculiarity when identifying a fault code for the ABS system: Before jumping the contacts, you must first remove the special jumper on the diagnostic connector (see figure).

About bridging contacts: it would be very useful to use, when bridging contacts, not “just a woman’s hairpin,” for example, but to make a small “device” that will “protect” you if the contacts on the diagnostic connector are bridged incorrectly. “Reading” the fault code is done by simply counting the number of flashes of the orange “CHECK” banner (or banner with a stylized image of the engine) on the instrument panel. There are dozens of “long” blinks of the light bulb. “Short” flashes – only a few. Or graphically:

no fault (normal operation)

Fault code: N21, N32

Where is the diagnostic connector located?

Almost every owner of a car like a Toyota Corolla, who took a good look at his car, noticed a small, black, closed box with the inscription “Diagnostic”. As a rule, it is located under the hood - most often on the rear wall of the engine compartment. Finding it shouldn't be too difficult. It is easily accessible and very visible. So, we lift the hood and find the box. The photo shows the location of the box in our car. In the photograph, arrows highlight its position.

What is the diagnostic connector for and how to use it?

We lift the hood and find the diagnostic connector we need. It is always closed with a lid - just pull the petal from the side and the lid will come off without any effort.

What do we see? Before us are exactly 20 nests, each of which has its own specific meaning. At Japanese service stations, diagnostic testers are inserted into these connectors to identify problems. Here in Russia, there are few such devices, but you can find them. In extreme cases, you can do without a tester, but you will need some knowledge in the field of electrical engineering, as well as the ability to use a multimeter. Below is a photo of an open diagnostic box, as well as a diagram that will be described below. The diagram will tell you where and what nests are located.

So let's get started and look at each nest in order.

“+V” – this socket, when connecting the device, will tell you what voltage is in the on-board network at the time of testing. When the car is working properly, it is approximately 14.7 V.

“Fp” - this socket is designed to check the voltage on the fuel pump. When running, the normal voltage is 12-14 V. If you close the two contacts described above, the fuel pump will start working.

Further “E1”, “Te1” and “Te2” - these sockets are intended for self-diagnosis - a procedure that does not have any complexity. As we know, after we start the engine, the “Check” light comes on - after a while it should go out, but if this does not happen, then this means only one thing - the on-board computer has detected an error or malfunction in one of the car’s systems. It is self-diagnosis that allows you to find the problem.

Socket “Ox1” - intended for checking the oxygen sensor (lambda probe). To check it, you will need a special voltmeter, which you can ask around at automotive parts and equipment stores. It would be best to use a regular device and the “Vf1” socket. There, the check will be simpler, since the signal has already been processed by the electronic unit. It’s worth taking a closer look at the “Ox2” and “Vf2” contacts; if there are no contacts inserted into them, this means that you have a single oxygen sensor and, as a rule, this is good, since there are a lot of problems with them.

The same is with the “Ts” contact - it is designed to test the car speed sensor.

Now consider "W". It will be useful in cases where the control light has burned out and you need to read self-diagnosis codes. All you need to do is insert a dial voltmeter between the “+B” and “W” contacts; the oscillations of the needle will indicate the code.

“IG” is a socket that is useful in case of ignition failures. This connector produces a sequence of pulses supplied to the battery. To check, you will need a frequency meter or any other similar device.

That's basically all. This article did not turn you into a great Toyota diagnostician, but you learned the basics that can help you diagnose your favorite car yourself. Here you should remember one simple but very important rule - “if you’re not sure, don’t climb.” It is better to give the car to a qualified diagnostic specialist who will be able to assess the condition of your car efficiently and in a fairly short time. The most important thing when checking it yourself is not to damage your car even more, so be careful and don’t take on something you don’t understand.

Fault codes and their types

Self-diagnosis of Toyota Corolla 150 involves working with two-digit codes. There are only two types: 09 and 10. You can find out which option is being used by looking at the signals.

In the first case, a constant, rapid ignition of the light bulb should appear, with the length of the flash and pause being about half a second. In this case, the absence of malfunctions is indicated by blinking more than 11 times. The second type is present in the machine if the signal appears at different intervals. You can find out that there are no problems by constantly blinking at a stable interval of approximately 4.5 seconds.

There can be about 200 faults. Signal types 09 and 10 mostly specialize in one or another group of problems. For example, the first of these systems works with components of the 1ZR engine, which appeared on cars with a 130 body, and was later retained on 150 and later models. The most common problems are problems with a faulty or damaged air sensor. In addition, this also includes many shortcomings in the operation of the central panel (pointers, their incorrect display, and so on).

As for code 10, it can’t say much about the power plant as a whole (about 10 times less than 09).

Of course, the signals still concern the same air flow and temperature, but greater emphasis is still placed on the anti-lock and traction control systems. At the same time, problems with both ABS and TRS are divided into smaller ones.

Self-diagnosis

Diagnostic connector for models up to 90g.

Diagnostic connector for models produced after 90.

What can you check using the diagnostic connector? Much: Electronic engine control system Electronic automatic transmission control system ABS system TRC system SRS system (airbags) TEMS system (electronic shock absorber control) To do this, you just need to know how to correctly bridge certain contacts on the diagnostic connector: To check the engine - terminals “E1- Te1" To check the automatic transmission - conclusions "E1-TT" To check the ABS and TRC system - conclusions "E1-Tc" We will not go into details - “how and what happens inside the computer” when certain contacts are bridged, because this is quite complex process, but we don’t need it. There is a peculiarity when identifying a fault code for the ABS system: Before jumping the contacts, you must first remove the special jumper on the diagnostic connector (see figure).

Connection via adapters

If a non-standard connector is installed on your car (cars manufactured before 2000, or trucks or commercial vehicles), you can use special adapters or make them yourself.

On the Internet you can find a diagram for reconnecting connector pins similar to that shown in the figure:

If the car is in constant use or for professional work as an auto electrician, it is easier to purchase an adapter (adapter set).

For the AUTOCOM diagnostic scanner they look like:

The minimum standard set for passenger cars includes eight adapters. One connector of the adapter is connected to the OBD connector of the car, the other to the OBD diagnostic cable or directly to the BLUETOOTH ELM 327 scanner.

The use of adapters does not provide vehicle diagnostics in all cases. Some cars do not support OBD pairing even though they can be connected to the OBD connector. This applies more to older cars.

Overview and location of indicators and instruments on the panel

To begin with, we suggest that you familiarize yourself with the information regarding the location and designation of elements and icons on the shield.

For example, the instrument panel of a Toyota Corolla in the 120 body is considered:

1. Fuel filter element status indicator, used only in diesel car dashboards.
2. Vehicle speed limit system activation indicator.
3. The orange Check Engine icon, indicating the need for vehicle diagnostics, should always appear when the ignition is turned on, but after starting the engine goes out. If this indicator appears when the engine is running, this indicates that the power unit needs diagnostics. If this indicator blinks, this indicates that there is no stable neoplasm in the ignition system. In this case, the engine speed should be reduced until the indicator stops lighting.
4. Front fog light activation lamp.
5. Electronic tachometer. This device is designed to demonstrate crankshaft rotation speed. Revolutions are indicated in thousands.
6. Left information screen. It displays information regarding the fuel level in the tank, the temperature of the antifreeze when the internal combustion engine is running, as well as the position of the transmission lever.
7. The left turn signal activation indicator, designed in the form of a green arrow, always turns on automatically when the steering column stalk is turned. If the light begins to blink twice as often as usual, this indicates that a bulb in one of the cornering headlights has burned out. If the icon lights up continuously or does not blink at all, then most likely there is a problem in the electrical circuit.
8. The high beam activation icon is made in the form of a blue headlight.
9. The outside light activation indicator always lights up when the headlights are turned on.
10. The right turn signal is designed in the form of a green arrow.
11. The speedometer is one of the main instruments that the driver pays attention to most often. This device determines the speed of the vehicle.
12. Right information screen. When the driver turns on the ignition, it displays data on the outside air temperature, date and time. It also displays information about the trip, including fuel consumption and mileage traveled, data on the average speed of the car, and various warning messages. This display also shows the time since the engine started.
13. A light that appears when the rear fog lights are activated.
14. An icon that is activated in the event of a malfunction in the ABS system. It should always appear when the ignition is turned on, but after starting the engine it should disappear. If the light is on when the power unit is running, this indicates a malfunction in the system.
15. Symbol of the operating status of the system for adjusting the angle of illumination of the optics. Such an indicator is only available in dashboards whose cars are equipped with xenon.
16. Symbol of the performance of the traction control system. As with other components, it should appear only when the ignition is turned on.
17. The passive safety system performance icon on the instrument panel is designed in the form of a red light bulb. If the indicator starts to light up when the engine is running, then it is necessary to diagnose the Airbag system.
18. Indicator of the performance of the engine pre-heating device; this icon is only found on the dashboards of diesel-powered cars.
19. LED symbol for the seat belt monitoring system. It always appears when the ignition is activated, but if the driver or passenger is driving without a seat belt fastened, it will also light up while driving. Also, when the indicator is on, a corresponding sound signal will be heard.
20. Speed ​​limit activation symbol.
21. Control device for dashboard lighting, as well as a key for switching displays on the right screen.
22. The gear engaged symbol is used only in cars with a manual or robotic transmission.
23. This indicator is a device that monitors the status of the main car systems, the performance of which is displayed on the right screen. Appears only when there are malfunctions in the operation of these systems.
24. A key used to switch viewing modes on the right screen.
25. The handbrake activation symbol always lights up when the handbrake is on. If there is a problem with the brake system, this indicator will also light up - for example, if there is a lack of brake fluid.
26. An icon that appears when problems are detected in the robotic transmission.
27. Diode indicator indicating problems with the operation of the electric drive.
28. Battery discharge symbol. If it lights up when the engine is running, then you need to check the battery charge and recharge it if necessary (video author - Alexey Valerievich).

ELM327 OBD2 for TOYOTA Corolla, Mark 2, RAV4, Camry, Land Cruiser

The ELM327 interface is a communication channel between the electronic control unit and external software. The adapter decodes the incoming stream, converts it into an accessible format, and sends it to diagnostic software.

An important parameter for using ELM is protocol compatibility. Each block has its own type of information transfer. There are five exchange protocols:

• SAE J1850 VPW, PWM;
• ISO 9141-2;
• KWP 2000;
• ISO 15765 (CAN).

The Toyota lineup applies the following standards:

Cars manufactured in 2004 have switched to the ISO 15765 standard. The CAN bus has a higher packet transmission speed and duplex scanning mode.

Select the car model and year of manufacture to determine which diagnostic modes your car supports through the ELM327 adapter, as well as what protocol the OBD2 port is based on. The data is presented for the following models and their modifications: Allio, Auris (E150), Auris (E180), Avalon II, Avanza, Avensis (T22), Avensis (T25), Avensis (T27), Aygo, Camry, Celica, Celsior, Corolla , Echo, Etios, FJ Cruiser, GT86, Highlander, Hilux, Hilux VIII, IQ, Land Cruiser, MR-S, MR2 Spyder, Matrix, Noah, Previa, Prius 2, Prius 3, Prius 4, Proace, Rav4, Sequoia, Sienna, Solara, Tacoma, Tercel, Tundra, Venza, Vitz, Yaris

How to reset error data after diagnostics?

After carrying out diagnostics and reading the necessary information about vehicle breakdowns, it is recommended to erase the error data for correct operation of the system. To do this, some models provide a method for removing fuses (for different models this may be “HAZ-HORN”, “STOP” or “EFI”). The 30-second method of disconnecting the negative terminal of the battery is suitable for all cars. This method is not recommended for cars that have systems for adjusting to driving style.

Obdii - on-board diagnostic system

Does my car have OBD-II?

All cars and light trucks built and sold in the USA. after January 1, 1996, OBD II equipment was required. In general, this means all of 1996. model year cars and light trucks qualify even if built late in 1995.

Two factors will indicate whether your vehicle is definitely OBD II equipped: 1) There will be an OBD II connector as shown below, and 2) A sticker or decal under the hood will say "OBD II Compliant."

Connector

Pin 2 - J1850 Bus Pin 4 - Chassis Ground Pin 5 - Signal Ground Pin 6 - CAN High (J-2284) Pin 7 - ISO 9141-2 K Line Pin 10 - J1850 Bus Pin 14 - CAN Low (J-2284) Pin 15 - ISO 9141-2 L Line Pin 16 - Battery Power

Where is the connector?

The connector must be within three feet of the driver. and should not require any tools to be exposed. Look under the dashboard and behind the ashtrays.

Five OBD II Flavors

As long as the parameters or readings required by OBD II rules are uniform, automakers have had some freedom in communicating the protocol they use to transmit those readings to scanners. Naturally, everyone felt there was one right way, which is why we have five different OBD II communication protocols.

Large scanner consoles costing thousands of dollars include decoding and firmware software for all five protocols in their units, making them versatile. Less expensive home or small shop units are usually configured for a specific communication protocol. Make sure the scanner you are using matches the protocol of your machine.

What communication protocol does my car use?

As a rule of thumb, GM passenger cars and passenger cars use SAE J1850. VPW (variable pulse width modulation). Chrysler products and all European and most Asian imports use the ISO 9141 or KWP2000 scheme. Fords use SAE J1850 PWM (pulse width modulation) communication patterns. All 2008 and newer model year vehicles use CAN.

There are some differences between captive imports, such as the Cadillac Catera, a German Opel derivative that uses the European ISO 9141 protocol. If you have first-hand knowledge of other similar variations, please send them along and together we can build a more complete listing.

On 1996 and later vehicles, you can determine which protocol is being used when testing the OBD II connector:

• J1850 VPW - The connector must have metal contacts on pins 2, 4, 5, and 16, but not 10.
• ISO 9141-2 / KWP2000 - The connector must have metal contacts on pins 4, 5, 7, 15 and 16.
• J1850 PWM - The connector must have metal contacts on pins 2, 4, 5, 10, and 16.
• CAN - The connector must have metal contacts on pins 4, 5, 6, 14 and 16.

If your vehicle has this type of connector but doesn't have these pins populated, you likely have a pre-OBDII vehicle. To add to the confusion, even having a connector with the pins listed above is not a guarantee of OBD II. agreement. This type of connector was seen on some pre-1996 vehicles that were not OBD II compliant.

Information about cars up to 96

Reader provided by California Aviation Resources Board. This is a list of engine designations up to 96 OBD II. Please note that CARB recognizes engine series, not vehicle models, so engine designations are the true key to the vehicle. Models provided as a courtesy.

California Air Resources Board List of OBD II Certified by Engine Families and Models

A note on this listing states that the certification is for the engine group only.

The listed models are considered correct, but the engine is the decisive factor.

Obdii - on-board diagnostic system

Does my car have OBD-II?

All cars and light trucks built and sold in the USA. after January 1, 1996, OBD II equipment was required. In general, this means all of 1996. model year cars and light trucks qualify even if built late in 1995.

Two factors will indicate whether your vehicle is definitely OBD II equipped: 1) There will be an OBD II connector as shown below, and 2) A sticker or decal under the hood will say "OBD II Compliant."

Connector

Pin 2 - J1850 Bus Pin 4 - Chassis Ground Pin 5 - Signal Ground Pin 6 - CAN High (J-2284) Pin 7 - ISO 9141-2 K Line Pin 10 - J1850 Bus Pin 14 - CAN Low (J-2284) Pin 15 - ISO 9141-2 L Line Pin 16 - Battery Power

Where is the connector?

The connector must be within three feet of the driver. and should not require any tools to be exposed. Look under the dashboard and behind the ashtrays.

Five OBD II Flavors

As long as the parameters or readings required by OBD II rules are uniform, automakers have had some freedom in communicating the protocol they use to transmit those readings to scanners. Naturally, everyone felt there was one right way, which is why we have five different OBD II communication protocols.

Large scanner consoles costing thousands of dollars include decoding and firmware software for all five protocols in their units, making them versatile. Less expensive home or small shop units are usually configured for a specific communication protocol. Make sure the scanner you are using matches the protocol of your machine.

What communication protocol does my car use?

As a rule of thumb, GM passenger cars and passenger cars use SAE J1850. VPW (variable pulse width modulation). Chrysler products and all European and most Asian imports use the ISO 9141 or KWP2000 scheme. Fords use SAE J1850 PWM (pulse width modulation) communication patterns. All 2008 and newer model year vehicles use CAN.

There are some differences between captive imports, such as the Cadillac Catera, a German Opel derivative that uses the European ISO 9141 protocol. If you have first-hand knowledge of other similar variations, please send them along and together we can build a more complete listing.

On 1996 and later vehicles, you can determine which protocol is being used when testing the OBD II connector:

• J1850 VPW - The connector must have metal contacts on pins 2, 4, 5, and 16, but not 10.
• ISO 9141-2 / KWP2000 - The connector must have metal contacts on pins 4, 5, 7, 15 and 16.
• J1850 PWM - The connector must have metal contacts on pins 2, 4, 5, 10, and 16.
• CAN - The connector must have metal contacts on pins 4, 5, 6, 14 and 16.

Error code: Battery light comes on: causes, diagnosis and repair

If your vehicle has this type of connector but doesn't have these pins populated, you likely have a pre-OBDII vehicle. To add to the confusion, even having a connector with the pins listed above is not a guarantee of OBD II. agreement. This type of connector was seen on some pre-1996 vehicles that were not OBD II compliant.

Information about cars up to 96

Reader provided by California Aviation Resources Board. This is a list of engine designations up to 96 OBD II. Please note that CARB recognizes engine series, not vehicle models, so engine designations are the true key to the vehicle. Models provided as a courtesy.

California Air Resources Board List of OBD II Certified by Engine Families and Models