Questions tagged [obd-ii]

On-Board Diagnostics-II (OBD-II). Questions usually involve scan tools, their use and their compatibility, as well as how to interpret Diagnostic Trouble Codes (DTCs).

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1answer
605 views

How to calculate fuel consumption and CO2 emission on flex fuel cars using OBDII data?

Here is the thing: I'm trying to estimate the fuel consumption of cars using OBDII data. It's quite simple if we can treat each fuel and its stoichiometric air fuel ratio separately, but when it turns ...
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1answer
4k views

Does OBD II pin 16 output is always 12 Volt?

Does OBD II pin 16 output is always 12 Volt? Is it possible to the voltage is altering when ignition on, like rising from 12 to 14 Volt? Or Voltage output of the buses, trailers, heavy duty vehicles ...
4
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1answer
510 views

What kind of DLC did Toyota's have before switching to OBDII?

What kind of DLC did Toyota's have before switching to OBDII? What year did they switch to OBDII outside the United States?
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3answers
222 views

(Mandatory in the EU) CAN through OBD-II?

I know that in the US, since 2008 vehicles must have a CAN connection on the OBD-II plug, but what about Europe? Do vehicles have to add CAN to the OBD-II plug? Or is it possible to directly send ...
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1answer
1k views

What OBDII protocol does a 2014 Mitsubishi Outlander use?

I was trying to help out a friend with an intermittent stalling issue, but the OBD Fusion app could not connect to it via my ELM327 Wi-Fi adapter. The protocol setting was set to "Automatic", which I ...
4
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1answer
1k views

Engine Temperature from OBD data

Engine Coolant temperature is obtained from OBD. But there is no PID to get engine temperature. Obviously, they are related, rather proportional I guess. But can there be a case where my engine is ...
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3answers
1k views

Can the throttle position be high during idle

I used an OBD to get data from one of my friend's car - Volkswagen Polo 1.5L Diesel. But the car was idling at around 900 rpm, while the throttle position I got was around 22%. How is it possible? As ...
4
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1answer
504 views

Quick Oil Change place overfilled my BMW Z3

Just got this car, a BMW Z3 3.0 from a Tampa dealer and have not even had it 10 days and Check Engine Light came on. I wanted to get the oil changed to full synthetic just in case it wasn't and ...
4
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2answers
3k views

Can an ELM327 OBD-II reader report on anything other than engine trouble codes for a Mini Cooper?

My car (Mini Cooper S) has a service light and tire pressure light on, so I was expecting my new OBD reader to tell me what they were about, but it just says "0 confirmed emissions-related DTCs ...
4
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2answers
832 views

How can I rev a “drive by wire” car from under the hood?

I've got a 2013 Hyundai Accent with a noise coming from somewhere under the hood. Happens only at a fairly narrow band of engine speed (1100-1200 RPM). I've been trying to hunt around for the source, ...
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2answers
2k views

OBD2 CAN Protocol: ISO 15765-4

I understand that one of the CAN protocol that OBD2 uses to read vehicle data is ISO 15765-4. However this is the one that is used by generic OBD2 reader devices like ScanTool; And it provides a ...
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2answers
413 views

Does a CEL always result in an OBDII DTC?

Will any error which causes the check engine light to go on show up as a DTC during a regular OBDII scan? This is obviously only in relation to OBDII compliant vehicles. EDIT July 26th, 2016 So I ...
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1answer
413 views

What is SAE 0x15 Short Term Fuel Trim Bank 1 Sensor 2?

I was taking a look at a neighbor's car, and noticed this PID stuck at 99.22% This is in addition to the regular STFT PID 0x06 which is staying fairly close to zero most of the time. What is this ...
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1answer
771 views

Calculating AFR using injector flow rate and mass air flow

Is injector flow rate = Mass fuel flow? If so then AFR = MAF/Injector flow rate. Can someone please confirm this?
4
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1answer
192 views

How do I get the most out of a “smart” OBDII scanner?

I recently purchased an OBDII scanner that allows me to read and log data using my tablet. How do I get the most out of this device? I am already familiar with simply reading the trouble codes to ...
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4answers
4k views

Mini Cooper P1638 code

I have a 2007 Mini Cooper. It keeps throwing code P1638 on my code reader on these really really cold mornings, and the engine seems to search for idle, reving betwween 500RPM and 1400RPM. The car ...
4
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1answer
7k views

What is the OBD-II drive cycle for a 2003 Toyota Corolla?

This site includes a post with the specific drive cycle that resets the OBD-II monitors on several 2000-2002 Toyota vehicles. What does the drive cycle look like for a 2003 Toyota Corolla?
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1answer
223 views

OBD2 Mode 1 PID 12

What are the meanings of the returned values for OBD2 Mode 1 PID 12? One source shows me A0 Upstream of catalytic converter A1 Downstream of catalytic converter A2 From the outside ...
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1answer
953 views

Mini-VCI J2534 cable question

I purchased a mini-vci j2534 and I cannot get it to work with any of the ODBii software I have. I cannot read a honda, nor 2 chevy's. Is this cable ONLY for toyota programming software? I do have a ...
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1answer
64 views

Mode 06 approaching failure limit

In Mode 06 (OBD), one gets a current value, max value and a min value for every MID, TID supported. If the current value is out of the max/min range, that MID, TID is considered a 'Fail'. But there ...
4
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1answer
558 views

Android App for ELM 327 that allows to reset codes for Cadillac CTS

On my Cadillac I get engine light to come up because I have changed my petrol cap and sensor is malfunctioning. I got myself wifi ELM 327 OBD-2 reader, and by using my laptop I managed to get RPM of ...
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0answers
823 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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0answers
194 views

BMW E90: Coming Home automatically on darkness

I have a BMW E90 ( pre- facelift ) with light package . Currently my car is set so that the " Coming Home " function can by pressing the headlight flasher is switched off, press at ignition . My ...
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0answers
3k views

Acceleration problem, but only immediately after stopping

Symptoms: The following applies mainly when accelerating from zero speed at 1st gear in RPM below 2500. Above that RPM range, there is no problem (then acceleration is assisted by turbo-compressor). ...
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0answers
74 views

Integrating Fast OBD Readings and GPS

I'm working on a project to look at fuel consumption on different roads and I need the OBD reader to log the GPS coordinates every time it takes a reading. I'm looking at instantaneous fuel ...
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0answers
1k views

Unable to connect OBD2 scan tool

Cheerz, I have purchased recently OBD2 scan tool(Autel MaxiScan MS300) which supports ISO9141. My car (Mitsubishi Lancer GLX 1.3 1999) seems like ODB2 compatible using ISO9141-2 protocol for ...
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9answers
14k views

Is it safe to get power from OBD 2 port for dash cam?

Most dash cams don't have a large enough battery to record while the vehicle is off so most people recommend using an external power bank. However, to my understanding, most power banks with enough ...
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2answers
4k views

OBDII ELM 327 Bluetooth adapter - is it reliable? [closed]

I got myself such a bluetooth adapter for my car, because the display on the radio stopped working, and I wanted to see if it will show up any errors. There are even apps for Android that work with ...
3
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1answer
306 views

Can we determine the Cleaning Requirement of Air Filter Using OBD

Many a times, the dealer guy says that the unclean air filter consumes more fuel as compared to clean. So, my question is, is this really related to air filter? If yes, can we determine the case using ...
3
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3answers
9k views

What should I do about PS0128 “Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)” error code?

I have a Mazda 6 and recently purchased the OBD 2 module and saw the check engine light with the PS0128 Error Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature). I ...
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3answers
255 views

Is there a viable option for updating OBD-I to OBD-II in order to increase possibility of engine tuning?

I've been told this is a terrible idea and just wanted greater confidence even though the warning against has been taken. I want to be able to fine tune a 1990 car with an OBD-I port in addition to ...
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3answers
940 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 ...
3
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1answer
422 views

Need explanation on Commanded EGR and ethanol%

There are 2 PIDs listed in this Wiki page - Commanded EGR and ethanol%. I have tried getting the values from some cars but have not succeeded. I am curious to know what do these 2 PIDs mean? Can ...
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2answers
1k views

Gear ratio from speed and rpm

https://stackoverflow.com/questions/30017271/obdii-determine-gear-given-speed-and-rpm Referring to the above link, one method to find the current gear ratio is to calculate Speed/rpm (The rpm is the ...
3
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3answers
12k views

Failed inspection on because of OBD2 readiness

My 2008 Hyundai failed inspection because the OBD-II system is in a "not ready" state. The mechanic asked if my battery had died recently. It had, after getting an alignment. He suggested driving on ...
3
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3answers
10k views

P0420 in a Prius

EDIT #2: I rescanned, looking at the correct data, and found the rear O2 sensor was definitely bouncing up and down with the forward sensor's lambda reading. Since I have looked for leaks and couldn'...
3
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1answer
7k views

What does error code: POO13 mean?

My vehicle: Saturn VUE 2008, 2WD 4Cylider. Checking light is steady on. Read code at auto zone store, POO13. The mileage is only 45K. I have no idea. Thanks for advice.
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3answers
16k views

OBD2 not communicating

Long story shortened... I have a 00 GMC Sierra, 4.3 v6 SE Stepside. I back probed the wrong plug wire on the BCM using the wrong method (test light rookie mistake, DMM only...got it, lol). The ...
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1answer
1k views

BMW - Reading fault code without OBD reader

OK - this is frustrating. It was dead simple to read the error code on my old 323i using the button on the stalk. I recently bought a 2014 328i xDrive and for the life of me cannot find a way to ...
3
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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 ...
3
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2answers
358 views

How can I troubleshoot a U0208 DTC code on a 2009 Land Rover LR2? [closed]

How can I troubleshoot a code U0208 on a 2009 Land Rover LR2? It has a 3.2L engine. Thanks!
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1answer
2k views

How to Reverse engineer the manufacturer specific protocol on OBD2 for acquiring enhanced vehicle data

I understand that generic OBD2 readers gives a limited set of vehicle data (PIDs). Enhanced set of vehicle data could be aquired via the protocols which is car manufacturer specific (not published). ...
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2answers
82 views

OBD reader returning “0 Codes” way too fast?

Normally, when I read my '07 Hyundai Sonata, the reader takes about 10 seconds and then returns "0 Codes" (or whatever). However, I just was checking out a 2010 Sonata. I hit Read and it popped up "0 ...
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1answer
620 views

P2104 Throttle Actuator Control System Forced Idle error, but car runs fine

2 days ago, I had to jump start my 2009 Chevrolet Aveo. I suspect I left the interior light on all night which drained the battery. After I started the car, the engine warning indicator was on. (It ...
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3answers
83 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. ...
3
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1answer
198 views

Interface tracking device with OBD II (or alternative sources of data)

I have recently been working on writing software for some very small tracking devices. I decided to take on an electronics engineer and start building some boards myself using a GPS/GPRS module. I ...
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2answers
671 views

Calculate current drain from the battery in a drive

Control module voltage is one of the OBD PID. It signifies the car battery voltage. Is there any way to calculate how much current is drawn in a drive (say 7 km from my office to home). The voltage ...
3
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1answer
7k views

Read vehicle speed data in real time

I need to read vehicle speed (velocity) data in real time for my research project. How can I achieve that? What HW and SW do I need for it? I guess it can be read from CAN bus via OBD2 interface? I ...
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3answers
7k views

How can I check if my 1995 Lancer CC GI has OBD-II

As my title say I want to know if my current car that I just purchased has an ODB-II port. I have looked under the steering wheel and I can see what I think to be a OBD-II connector, but am unsure. ...
3
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1answer
29 views

OBD2 not showing up under Bluetooth devices

When plugged into one car it shows up but in the other one it doesn't. So I know the obd2 itself scanner is not dead. In the working vehicle all functions are working. works in 2005 Porsche Cayenne. ...