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Questions tagged [obd]

An acronym; On Board Diagnostics.

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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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35 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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1answer
26 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 ...
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Can I transmit messages to ECUs via OBD without access to CAN Bus

I am new to automotive electronics and have been reading about OBD and CAN bus. what i undnerstand is OBD port is kind of a standard now, so my questions are If I get control of OBD port through my ...
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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 ...
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1answer
66 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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301 views

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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1answer
33 views

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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22 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 ...
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1answer
72 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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1answer
1k views

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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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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94 views

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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99 views

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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2answers
311 views

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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59 views

Where to find CAN buses

I actually know that on some cars, CAN buses are not directly broadcasting on the OBD-II port and is acting as a gateway for requests. So when sniffing the CAN bus on the OBD port of those cars we ...
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1answer
200 views

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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2answers
352 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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19 views

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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1answer
3k 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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2answers
463 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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349 views

1995 GM OBD transitional 1.5 scan tool [closed]

I have had a 1995 Pontiac SSEi for 2 years without a code reader but now want to buy one. From the previous discussions I have read, there seems to be no available and affordable scan tool. Has anyone ...
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536 views

Catalyst Temperature

Please refer to Catalyst Temperature PIDs (mode 01 pids 3C, 3D, 3E, 3F) for the following questions - https://en.wikipedia.org/wiki/OBD-II_PIDs#Mode_01 Q1. Is there a thumb rule that the catalyst ...
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1answer
34 views

When connecting diagnostic PC to OBD port - What is the most detailed output file?

When the garage connecting the "official" manufacturer software to the OBD port in the car - What is the most detailed file that can be retrieved, containing all the raw data information? Thanks,
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638 views

Calculate Intake Manifold Absolute Pressure from MAF Engine using OBD Data

I need to calculate Intake Manifold Absolute Pressure from OBD Data. I have Toyota Corolla GLI 2010 Model. This car has MAF engine which does not return Intake Manifold Absolute Pressure. Where'as I ...
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Less than specified bytes of data from OBD

0100 (https://en.wikipedia.org/wiki/OBD-II_PIDs#Mode_1_PID_00) should provide 4 bytes of data. But there has been cases, like Audi A4 2.0 TDI, where the data from 0100 was less than 4 bytes. So is the ...
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1answer
114 views

Toyota Avensis Verso 2002 (sold in Italy) CLM20L - which OBD version compatible?

I seem to have problems with nailing down the interface version of the OBD socket in my car. Is it OBD, OBD2 or EOBD compatible? I know the differences between them in theory, but there is no solid ...
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1answer
336 views

OBD2 expert in ipad to bluetooth elm327 mini

Just bought OBD expert on grounds good to go in an ipad (version 9.3.5 13G36) It just wont detect the adapter from my ipad. Adapter is fitted and red light on. Am I wasting my time with an ipad and ...
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731 views

What is the difference between Toyota GTS and TIS software?

I've found two types of Toyota OEM software available. One is the GTS ( Global Tech Stream ) software which is freely available from Toyota's EU site. The other is the Toyota TIS ( Technical ...
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1answer
1k views

OBD MIL commanded status and DTC stored

OBD-II Mode 01 PID 0 gives commanded MIL on (bit A7, see link) and Number of confirmed emissions-related DTCs (bit A6-A0, see link). I did hit Mode 01 PID 01 on a few cars but got surprising results. ...
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1answer
466 views

Mode 01 PID 01 OBD-II

https://en.wikipedia.org/wiki/OBD-II_PIDs#Mode_1_PID_01 Mode 01 PID 01 - Monitor status since DTCs cleared. In the 1st chart, B7 is 'Reserved' and must be 0. But for a few cars (like Skoda Rapid) ...
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1answer
121 views

Relation of VIN of a car with emission norms of a country it is sold

A VIN of a car determines the country of manufacture. So if a car has a VIN of Canada (CARB emission standard) and is sold in India (BS-IV emission standard), will the car comply with BS-IV standards? ...
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2answers
697 views

Emission performance of a vehicle using OBD

The California Air Resource Board uses OBD scanner for emission testing. (https://www.arb.ca.gov/msprog/obdprog/obdprog.htm) In other places like India, 'tail pipe exhaust gas analyse' method is ...
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2answers
5k views

What is Honda HDS HIM?

I've been trying to find inexpensive PC based ways to connect to the older Honda's which use the 3-pin OBD connectors. I have run across a package being sold in various places called Honda HDS HIM. I ...
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1answer
222 views

Duplicate OBD code - or reading it wrong?

'94 Grand Cherokee 5.2L, TBI. Has OBD, not OBD-II. The Check Engine Light came on after 10-15 mins running. Checked error codes using the ignition key method, wondering if I'm reading the flashes ...
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220 views

SilLabs OBDscan can't connect to Alfa 147: latency too high!

I have an OBD Scan tools built around the Silicon Labs CP210x chipset, but I can't get it to connect to my car at all. When I connect the scan tool to my laptop USB port I have a driver installed and ...
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5k views

Reading OBD Data from the Old Honda 2+3 Pin DLC

I've got a 2000 Honda Civic iSR with the old 2+3 pin Honda DLC which I'd like to read ECU data from. According to the Evoscan website the pinout for the 3 pin dlc is ISO 9141 K-Line, B+ and ground ...
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791 views

Difference between FMS and OBD

What is the difference between FMS and OBD. Whether OBD is a standard or protocol. Recently I am working on a GPS device to tap the CAN bus in order to integrate with our fleet management system. In ...
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3answers
809 views

Retrieving handbrake status light and reverse light from OBD II

I have a project to replace my car's instrument panel with a Android tablet. So I'm developing an application that communicates with an ELM327 device through bluetooth. I have managed to successfully ...
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0answers
312 views

2005 Impala OBD2 not working right

I have a 2005 Chevrolet Impala (Base trim, 3.4L) and I recently purchased a cheap OBD2 Bluetooth reader. Unfortunately, Torque (Android app) isn't able to read data from this transmitter when ...
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1answer
463 views

What does the OBD error code P0100 mean?

What does the OBD error code P0100 mean? I have an engine misfire with the check engine light on in my Nissan N16 Supper Saloon -1300cc - 2000 model year. The engine started to produce less power. An ...
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2answers
73 views

Auto determine the bluetooth device is OBD or not?

Current I am working on OBDII. While in bluetooth discovery to connect obd, How I determine which device is obd and which device is normal bluetooth device.Because I want auto connect my app with obd. ...
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3answers
6k views

Mode 02 - Freeze frame data use

I got some data on sending 0202 command (Mode $02, PID 02). It is the freeze frame data. I don't understand why does anyone need the data? Do anyone (including mechanics) ever open Freeze frame data? ...
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2answers
4k views

Horsepower at wheels calculation

I have used Torque Pro App for sometime in my Hyundai i10 Era (2011 model) and it gives me Horsepower at wheels. But the values seems to be much less. To find out the problem, I logged the car OBD ...
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1answer
126 views

Fault code decoding

I tried getting mode 03 (fault code) for Volkswagen Polo and Toyota Innova. I am unable to find how to decode it. Can someone please help me decode it (the method to decode the hex response) Volvo: ...
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181 views

CAN data for Mahindra

I bought a new Mahindra Scorpio S10 and have been trying to read the CAN bus using ELM 327 Bluetooth OBD and Putty. Configurations in Putty: Baud Rate 9600 (tried 115200 also), Data bits: 10, Stop ...