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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61 views

ELM327 — how to read parameters

I got the ELM327 adapter and downloaded the carscanner app. It really did help understand some problems my 2016 rav4 was having lately. But I'm not sure how to interpret some of the parameters, i.e ...
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15 views

OBD GPS device stopped working?

I own an Indian version i20 and plugged in an OBD device (zyme pro) to track the car. It worked great for 2 days however i went to motor shop for seat covers and reverse camera and suddenly the GPS ...
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100 views

Isuzu D-max 3.0 2009 port OBDII

I'm not a mechanic or anything, but I'm too curious. I live in Colombia and I have a vehicle that is marketed here as Chevrolet Isuzu D-max 3.0 model 2009 (diesel engine) I know that my vehicle has ...
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822 views

Calculating fuel flow rate through obd || sensor not supporting 015E and 0110 commands

I have been working on a project where i want to calulate fuel flow rate using data from the obd2 sensor. The car on which i was testing didn't support the pid 015E which is for fuel flow rate. Then i ...
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2answers
78 views

Interfacing with CAN bus

I am looking to write an application in C# and use both ARM based computers and x86 based computers. My question here is when using a J1939 to DB9 cable, do I need a specialized interface for the CAN ...
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94 views

how do i put a mileage 'block' on the obd11 connector?

how do I stop my vehicles data from being transmitted to the obd11 connector under the dash, is there a single pin that can be removed/disconnected that will do this? (VW new beetle 2001)
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1answer
74 views

To run a new ODB-II line from car computer

I bought a used Toyota Camry 2010 sometime in August. I noticed that there is no OBD-II port in the car. I have checked everywhere in the driver side and even passenger side. I noticed the car was ...
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203 views

Nagging P0430 (and now a pending P0420 too!) 2004 Lexus ES330

I've got a 2004 ES330 (2nd owner) with roughly 315,000. We didn't pay much for the car in 2012 with 164,000 miles. So, i've never gone overboard in maintenance of it. A year ago, when it was time for ...
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86 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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1k 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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47 views

After querying RPM and fuel, OBDII is lighting all my dashboard lights

I'm using OBDII and after querying the rpm and the fuel, all the light in my dash board is lighting. How do I need to query the car? Why might this have happened?
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734 views

Where is OBD port location

Where is the OBD II port on a Honda Civic 2012 located? A picture would be good. Thanks.
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98 views

Is FMS data more reliable and plentiful than OBD data?

Im looking into both OBD and FMS. I have read that FMS provides more data, yet obd seems to have much more PIDs available? Is this correct or am i missing something. Thank you
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1answer
608 views

Flashing O/D (OverDrive) light — Where is the code?

I'm working on a 2007 Ford Mustang. The O/D light is flashing and the transmission has some rough shift transitions. When I use OBDII to read the codes, there are no faults found, no faults in ...
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1answer
773 views

IAT reading higher than ambient temp. Is that normal?

My car's engine comes with a Bosch hot film airflow mass meter. The probe inside the sensor's body features both the actual airflow sensor and what looks like a thermistor. I'm telling you that ...
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1answer
100 views

How frequently can I poll OBDII monitor codes?

I'm interested in realtime information for the MONITOR_VVT_B1 and MONITOR_MISFIRE_CYLINDER_(1|2|...) monitor codes. I would poll them about once a second, maybe slightly more frequent. Is it ...
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1answer
499 views

What's the relationship between CAN identifier and ECU in OBD-II standard

Scenario When getting car datasets constructed by logging CAN traffic via the OBD-II port from a real vehicle for the intrusion detection, I've got the some CAN frame with 11-bit CAN identifier, for ...
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27 views

2001 Nissan Xterra drivability

2001 Nissan Xterra SE, 3.3L V6, automatic, 2WD, towing package, 150k miles Some history, perhaps useful: I bought this vehicle from a friend a few months ago. Vehicle was in good shape for its ...
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146 views

Proton Jumbuck ECU code retention

Anyone know if it's possible to clear fault codes from a Jumbuck's (my brother's) ECU by disconnecting the battery and if so, how long it needs to be off power. We've found 2 codes for the O2 sensors, ...
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1answer
128 views

Weird OBD2 error on newer Honda models

We are using an OBD device (https://freematics.com/products/freematics-one-plus/) for some research work. We tested on several cars like Honda 2006, Subaru 2018, VW Golf 2013, Mercedes GLK 2017, etc. ...
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3answers
22k 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
276 views

Can I use a BMW round 20 pin to OBD II adapter with a OBD II scanner?

I'm looking to buy an e30 or e36 BMW and 99% of those don't have an OBD II port because they were made prior to 1996 but they all have the BMW round 20 pin I believe. I came across this adapter:and I ...
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1answer
94 views

Accident Detection, Tow Alert, Level of Car, VIN, Fuel Level Input, Ignition Control using ELM-327 OBD-II

We are building a mobile application for vehicle diagnostics. We are using the ELM327 OBD-II tool for fetching the data from the car using Nodejs. The application is being built and we are facing some ...
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1answer
70 views

High rpm on neutral but flatting the gas pedal on D doesn't increase the rpm

I am making this question as an update to my previous question . I am not sure if updating that question will draw attention to it or keep it buried in the sea of questions here, if it gets updated ...
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1answer
805 views

Honda Odyssey (2002) proper troubleshooting of code p1751

Code is accompanied by rough shifting when cold. If I drive hard when its cold it will go into limp mode. If I take it nice and easy until its good and hot it seems to shift fine. I've been searching ...
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1answer
112 views

Which value should takes to show Gauge value, Fuel pressure or Intake Manifold Pressure?

Currently, I'm working on an app which should show Gauge value (inHg) of the vehicle using OBD reader. Which values should I use to show the Gauge? Is there any formula?
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1answer
4k views

P0380 OBD-II Trouble Code: Glow Plug/Heater Circuit “A”

I found the following error in the error log of my Ford Focus Tunier 1.6 tcdi diesel 109HP (2006): P0380 OBD-II Trouble Code: Glow Plug/Heater Circuit “A” First i thought it was due to a defect ...
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1answer
342 views

Calculating power consumption through OBD port

I need to calculate the power consumption of my device. The device is composed of an esp32 board with a cellular module, powered though an OBD port. I want to have to connected to the OBD port of a ...
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1answer
2k views

After odometer/mileage correction, which module data gets changed - engine or instrument cluster?

I read that the PCM tracks mileage for it's own purpose and BCM tracks and stores it for instrument cluster module to display it. So, when someone does an odometer/mileage correction, does it change ...
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1answer
367 views

Does obd scanner remove check engine light only or doers it also removes unfixed codes from memory?

If you use an obd reader to to delete the check engine light for a problem which hasnt been fixed, the check engine light will eventually come back on. My question is, regarding the code that is on ...
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1answer
31 views

Is there a reason to monitor calculated (not measured) OBDII mode $01 catalyst temperature values?

My assumption is that on a 2 bank system, if both catalyst always read the exact same temperature, the values are calculated or inferred from other sensor inputs. My guinea pig is a 2005 Ford ...
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41 views

OBD several errors big picture

I have a proton wira 2004 which is essentially a Mitsubishi Colt, I got these errors when I connected an OBD2 device. Could anyone tell me the big picture, what do they mean combined? Thanks in ...
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3answers
505 views

Is obd code P0133 anything to worry about?

The day before I got this obd code I changed clutch and gear box oil. 15 minutes before I got this code one of my brakes pads completely wore out. I read a bit about the code and I guess they are not ...
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1answer
80 views

Ca. Smog Test Problem

I took My 2000 Dodge Durango 4.7 engine to get it smog tested in Ca. The tester tried at least 3 times to communicate with my OBD syst. with no success. He then took my truck off the machine and ran ...
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178 views

Normal load and long term fuel trim operating range for 2008 Toyota Matrix with 129,233 miles?

When accelerating up an on ramp, are 90%+ engine loads and 10.90 long term fuel trim values within normal operating range for 2008 Toyota Matrix with 129,233 miles? Edit: - added full spreadsheet
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1answer
3k views

Calculating current fuel level with obd data

My car does not provide the fuel level data to the obd. this is the data the car do provide: engine coolant temperature, engine load, ambient air temperature, engine rpm, intake manifold pressure, air ...
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1answer
65 views

My 2008 Miata only has 3,600 miles on it but failed the smog test

2 OBDII monitors (evap system, and EGR and/or VVT system) have not yet finished self-checks, apparently because the battery was replaced. The smog station says I need to drive the car about 75 miles ...
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1answer
4k views

Mysterious Check Engine Light but no codes

On a recent business trip where I was, unfortunately, driving my wife's 2006 Toyota Camry, the Check Engine Light (CEL) came on after about 90 minutes of driving. I had no tools with me, but stopped ...
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1answer
3k views

Rough idle and 02 sensor voltage drops to zero, cylinder 2 misfire

Vehicle is a 2007 Dodge Nitro R/T with a 4.0L engine. I've had a lot of trouble diagnosing a cylinder 2 misfire and looking for help on next steps. Symptoms After engine is warm, stop and go ...
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1k views

Decoding VW Airbag DTC from elm327

I am using PuTTY (similar to HyperTerminal) and elm 327 (OBD Link LX) on my VW Polo 2015 model to read Airbag DTCs. Command sent: AT SH 715 Received: OK Command sent: AT CRA 77F ...
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5k views

OBD-II difference between signal ground and chassis ground

Am planning to install a carputer (Raspberry Pi) in a 2005 Ford Mondeo, replacing the car stereo. The Quadlock connector to the stereo apparently includes CAN bus, so I am thinking I will get a USB ...
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1answer
793 views

Can i control the brakes of a car by the OBD II Interface?

I'm doing a senior project about automating the braking system in cars and make it smarter
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2answers
869 views

Are OBD-II PID codes the same for all car manufacturers?

In the Wikipedia PID list we can see that 0x0C for engine RPM, 0x0D vehicle speed, etc. Is this same for all car manufacturers? In Arduino examples we can see that data[2] reserves the PID (for ...
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3answers
606 views

Are there any affordable OEM scan tool options for DIY-ers? [closed]

Every scan tool I've seen offered to consumers only provides basic OBDII or CAN data. Some only offer the ability to view basic stored codes, and maybe a freeze-frame capability. This $20 scan tool ...
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66 views

Truck fleet monitoring project

I need to design a truck fleet monitoring system and make a prototype of it during my traineeship this year. I've been looking into the different buse networks that are already implemented in trucks ...
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132 views

Developing an OBD2 application - Engine Warning Lights

I am currently developing an application which retrieves diagnostic trouble codes from my car's OBD system and display any DTCs in a list. However, as my car has no trouble codes I am unable to test ...
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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 ...
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3answers
1k views

What data are logged, at which frequency, and what is the size of the log?

Is there a way, for a given car model, without physical access to a car of this exact model, to find what data are logged, what is the frequency at which they are logged, what the size of the log is, ...
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635 views

OBD2 mode 3 wrong response

I'm a research engineer working on OBD2 scanner, I'm using ELM327 v1.5 interface to communicate with cars. I used Dacia Logan 2013 (French car) to test OBD2 modes, the MIL indicator was ON. When I ...
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106 views

Android OBD2 Fuel

Currently I'm developing an Android app that uses an OBD2 ELM327 device to read some data from the car, so I could use it in my application. Now, when I want to read the fuel, fuel consumption or ...