Questions tagged [obd]

An acronym; On Board Diagnostics.

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Honda Civic 2002 strange OBDII pinout

I have some trouble understanding the pinout of my OBDII plug. It appears that it has both grounds, K-Line, 12V and CAN Bus low (according to standard obdII plug). Therefore it does not have even one ...
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0 answers
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One crook messed with my chevy's obd

One crook messed my OBD port by short circuiting the power lead with sensor leads, Is my ECM damaged? My instrument cluster blinks even when the car is off and locked - It blinks when starting - ...
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Need a new OBD computer

I have a 97 Ford E350 7.3 Turbo Diesel. The OBD has failed, there's a hole burned in the circuit board and it can't be rebuilt. I don't need a Module, I need an OBD unit. 97's are impossible to find. ...
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How and what would I get from a car rain sensor?

I am looking for an answer on how to acquire data for the vehicle rain sensor and automatic wiper data from any vehicle. For example, I know that with Carberry (a Raspberry Pi) it provides a lot of ...
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0 votes
1 answer
58 views

Can anyone offer advice on MUTILPLE codes all seeming to deal with my transmission

2001 Ford Taurus Wagon with 124K miles Duratec engine Drive car yesterday and everything seemed fine. Came home and parked it like always. Today the car runs but both the check engine light and the ...
2 votes
2 answers
329 views

How does OBD2 work with CAN?

I understand how CAN works (I think). Good info here if you would like to see: Difference between OBDII and CAN So very briefly, there are multiple modules and each module posts interesting data on ...
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11 votes
8 answers
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What is the point of performing an OBD2 diagnostic scan if there is no malfunction indicator?

Where I live, it is common for car mechanics to help their customers who are planning to purchase a new used car by performing an OBD2 diagnostic test on the car in question, even if there are no ...
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-1 votes
1 answer
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Obd2 not working, need to rewire

1996 chevy p30 5.7L Obd port wasn't working. After I looked under the dash it's apparent someone has cut all the wires and never wires them back in. I guess there was front end damage so I assume they ...
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458 views

How do I factory reset an OBD2 ELM327 device (not reset ECU)?

it no longer puts out wifi thank you tried turnning it off for a day, it has no reset button on the unit or PCB here is more information: Here is more information https://security.stackexchange.com/...
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1 answer
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how to check car for impending failures? [closed]

My kia Sorento 2007 failed on me multiple times. Each time disabling the car and putting the driver in danger harmonic balancer alternator radiator and water pump in each of those failures, I had ...
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1 vote
2 answers
107 views

obd2 device on obd1 vehicle?

is there any way to make a obd2 plug in device (example gps tracker Metro Smart Ride) work on a obd1 vehicle. The device works and still has service. I no longer own a vehicle with obd2, but I'd still ...
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Are OBD-II devices capable of controlling acceleration and top speed of a car? [duplicate]

I have been searching for a while for some specific type of OBD-II devices that can, besides performing the usual diagnostics, also do the following: GPS track the car online Has the ability to set ...
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1 answer
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0v across CAN bus lines

I am trying to connect to the CAN bus of a heavy trucks 24V OBD2 port. I have already tested my setup with a van, and confirmed it working. The only differences I can see between the 2 vehicle's ...
5 votes
3 answers
1k views

How useful is a low-end corded OBD-II reader for inspecting a used car?

I purchased a low-end OBD-II reader from Wal-Mart a few months ago. Now I'm in the market to purchase a used car and I was wondering how useful the reader will be when I go to look at the vehicle. Of ...
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1 vote
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Incomplete Monitors

I changed my Hyundai 2000 Accent battery and My CAT and EVAP monitors will not complete. I have tried a generic drive cycle and monitors will not complete. Any suggestions.
2 votes
1 answer
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Using a device with external power and receive data from the CAN bus

I want to keep a device in always on situation in the car. I do not want the device to drain the car battery. The car is used at least once in two days and the current consumption of my device is ...
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-1 votes
1 answer
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any obd dongle with the ability to stream live data ie CO2, HC and NOX?

any obd dongle with the ability to stream live data ie CO2, HC and NOX ?
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1 answer
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Electricity not working when car is off

2015 Honda Accord Replaced the battery in my wife's car. After replacing the battery, it seems as though none of these things work when the car is off - Headlights, Dome light, Power locks, key fob (...
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4 answers
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How to power up OBD device without ignition to vehicle?

i would like to power on the obd device without ignition to vehicle. Am trying to establish some connection for programming work buy connecting to my laptop. Any way to do this?
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Manual calculation of engine load [duplicate]

Calculated engine load (PID $04) is determined (according to SAE J1979) by equation: LOAD_PCT = [current airflow] / [(peak airflow at WOT@STP as a function of rpm) * (BARO/29.92) * SQRT(298/(AAT+...
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3 answers
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Broad question about sensor replacement in cars in general

As a shade-tree mechanic, I am rather frightened of doing repair work that involves disconnecting or replacing sensors in general. One of my fears goes like this: I hear stories of people performing ...
1 vote
1 answer
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Siemens sim2k-34vr ecu parametrs and service ids

I need to read parametres like RPM of the engine from siemens sim2k-34vr ECU from obd2 port through K-line protocol,I tried standard service id 0x01 to read current data but ECU said 0x01 service id ...
5 votes
1 answer
1k views

About heavy-duty vehicle diagnostic port

I am trying to design an ELD device that could be connected to the deutsche 9 pin and 6 pin port on heavy-duty vehicles. Is there any place where I can get the pinout configuration of these ports for ...
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1 vote
1 answer
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OBD2 port construction, Toyota Camry 95, and Dodge Durango 2002

I have a product that takes an OBD 2 plug for power and I don't want to use my standard OBD port. I need to create an OBD 2 port for power purposes only, how could I do this and does the port run at ...
2 votes
0 answers
38 views

Bmw N52N Lambda probes madness

Owner of a BMW E60 523i LCI Automatic (N52N engine. aka N52k). 105000 Kms on the clock. The error codes below after deletion, re-appear after 300~400 Kms. It is theoritically impossible for 4 lambda ...
0 votes
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Car hacking - e.g. auto closing windows when locking

Im new to car hacking. I want to modify my car. The target is that the windows close automatically when i lock the car. I found out that I can use the CAN2USB Device to connect the car to a linux ...
1 vote
0 answers
209 views

Problem diagnostic on Toyota Estima

In relation to my previous question: Hybrid battery not charging fully This morning I took the vehicle to the mechanic who has serviced all of my cars for the last 10 years. He called me later in ...
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1 vote
1 answer
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Use OBD to check car status

i wanted to know if it's possible to use a cheap OBD scanner connect the car to a computer and see the status of the locking system, if the car is locked or not, i dont want to change or send orders ...
0 votes
2 answers
78 views

Oxygen Sensor Engine Light

I had Oxygen Sensor Engine Light that complained about the Bank 1 Sensor 1. I used my OBD2 tool to clear the code, and the engine light is not coming back. Can I leave the sensor as is or still I ...
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3 answers
680 views

Are all OBD current data available on the CAN-BUS without request?

I am analyzing the CAN-BUS data from my motorcycle. I logged all the CAN-BUS traffic. One time with an ELM327 adapter connected and one time without. I am searching for the value of the Intake air ...
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1 vote
0 answers
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P0340 code, even after camshaft sensor replacement [Solved]

I drive a 2004 Honda Civic ex coupe manual with ABS, engine code D17A2 (SOHC, Vtec) I was driving my car and slowly revved up to 7krpm (smart, I realize) and suddenly my car lost power until 3500rpm ...
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1 vote
2 answers
512 views

OBD2 device that connects over cellular data?

I'm looking to monitor any and all stats of my vehicle. Are there any OBD devices that connect remotely over cellular data, and come with a nice phone app? I'd like to be able to monitor the car from ...
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2 votes
0 answers
1k views

Can an OBD2 device be used to limit vehicle speed?

Is it possible? And if so, which OBD2 device can do it?
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1 vote
2 answers
409 views

Re-wiring OBD port

I was reading online about thieves 'hacking' the OBD2 port on push button start vehicles and there seems to be little discussion around OBD2 port locks or moving OBD ports. I was wondering if any has ...
1 vote
0 answers
18 views

Konnwei kw30 diagnostic equipment

Just got a konnwei kw830 diagnostic tool I plug it into my car which I know has a fault as I have checked on another system and that comes up with fault key 1 which means my car key has lost its ...
1 vote
1 answer
184 views

How difficult is it to collect obd commands ?Will it be different for different brands?

OBD is something very interesting I found these days.Thanks to this repo https://github.com/pires/obd-java-api & wikipedia which provides the basic information of PIDs.But there is a lot of ...
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5 votes
1 answer
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On Board Diagnostics-II for Electric Vehicles

I'm learning about OBDII, and I'm wondering whether it is valid on EV's too. According to Wikipedia's PIDs article, the Service 01 PID 51 (or Fuel Type) has a value 8 that means that the fuel type ...
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1 answer
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How to save time history of cars' performance parameters with or without OBD

For a research study purpose, I am trying to get car's performance data i.e. speed, acceleration, maps (lats & longs) and may be braking during a drive. I need time histories of these parameters. ...
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1 vote
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55 views

Where are the Logics and Data of the OBD System Stored?

I'm wondering if OBD Data is stored and processed on it's own board or integrated into other systems, or both. Or neither. Wikipedia just confused me further. What I got out of the wiki is that OBD ...
0 votes
1 answer
137 views

Lost keys and have no obd port, what should I do?

Car is a civic vti 1999. Lost the keys and auto locksmith is saying he needs the obd port otherwise he can't reprogram it. I cannot find it on the car and a friend tells me these hondas do not have ...
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1 answer
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Car suddenly stops accelerating and overheat indicator comes on

Vehicle: Skoda Fabia TDI 1.2L diesel While driving back home, the car suddenly stopped accelerating and the RPM was stuck at 1000, even when I applied more gas. Immediately after, the overheat ...
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0 answers
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Truck's exhaust temperature: how to read EGT sensor by ODB / FMS / Can-bus?

I succesfully decoded can-bus data from a VW Caddy, but know nothing about OBD and trucks. For a research I need now to read a truck's exhaust temperature (EGT sensor), possibly by OBD. I would ...
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1 vote
1 answer
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What do all these codes mean? 125331324255

My 1994 Jeep Grand Cherokee limited was running great, as always, but then a few day ago it didn't want to idle some times and without a shudder or misfire etc. the RPM would drop down to zero and die....
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1 vote
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Trying to access mode 22 data

I'm trying to get mode 22 diagnostic data from my 2006 Chrysler Sebring 2.7L and more specifically the misfire counts for each cylinder. I have an ELM327 that I'm using. My car uses the J1850 VPW ...
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2 votes
3 answers
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Could you instruct a car thru the OBD port to open the trunk even if the car was turned off?

Could you instruct a car thru the OBD port to open the trunk even if the car was turned off? Can you turn the accessories on from the port then open the trunk?
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2 votes
1 answer
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OBD-II or CANopen

I am relatively new to CAN Bus and been doing some research on a new system we have to develop that monitors a mobile compressor. This compressor is towed behind a truck, or sometimes left at the ...
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2 votes
2 answers
7k views

How do I disconnect my OBD port from my lower dashboard?

I am going to be checking my OBD port on my 2004 Subaru WRX for loose pins. The problem is that access to my OBD is uncomfortable at best (it's below knee level and pointed down). Even if I can ...
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1 vote
0 answers
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CAN Signals on OBDII

What CAN messages & signals are freely accessible through OBD-II? Can manufacturer close certain signals or only propretary ones? I know all CAN signals can be accessed but not interpreted ...
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3 votes
1 answer
4k views

OBD-II Mode and PIDs specifically used for Electric vehicles?

I am working on developing a vehicle CAN communications protocol being implemented in an electric vehicle. I was wondering if anyone knew if there is a standard MODE and PID for OBD-II messages ...
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4 votes
2 answers
984 views

OBD or CAN - what's mandatory (EU and US)

First of all, I've already tried to do my research and tried to get all the info I'm asking for myself (which obviously didn't work). I want to know if CAN or OBD(-II) are in fact mandatory in the US ...
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