39

Ok, before I will answer your specific questions, let's do some introduction on bus systems. It could be that you know parts of these things, but I will start here as people with little or no IT or electronics knowledge should be able to understand this as well. Bus Systems In electronic systems signals are sent from one chip to another using wires (let's ...


20

It is highly probable that the reason your car was reluctant to start was that the time you were running diagnostics had sapped some of the charge from the battery. The battery on the car will not charge unless the engine is running. It is unlikely that this device would harm your vehicle but it is theoretically (and practically) possible to do temporary ...


9

To my knowledge there is no way a scanner can cause issues with your computer electronics. This device is a read only device. It doesn't change anything in your computer. It does, however, communicate with the computer. Through this communication it can give the computer commands, such as to clear the codes. This doesn't write anything to the computer, but ...


9

OBD II is a US government mandated diagnostic interface. This interface is guaranteed to provide a specific set of information including but not limited to engine computer data and engine computer trouble codes. When OBD II was rolled out the US government did not force the manufacturers to also standardize the communication interface to the engine ...


7

Isn't it a standard, so all vehicles are wired the same (for a given connector)? The following information comes from the Handbook of hardware schemes, cables layouts and connectors pinouts website. Here is the SAE J1708 9-pin connector. H,J are not connected. A and B are twisted in cable. C and D are twisted in cable. F and G are twisted in cable. SAE ...


6

The CEL trigger implementation will vary across vehicles, but here are a few for you to try out. They should not have any negative effect in the long-term on the vehicle: P010x - unplug MAF sensor P030x - unplug a spark plug wire/coil (unplugging the corresponding injector is recommended) P0420/P0430 - unplug the O2 sensor after the catalytic converter


6

@JPhi1618 answer is good. I would just add a few more, You can unplug the EGR Valve electrical connector, no harm to engine. Pull out a coil pack or coil wire.


6

Start unplugging stuff. The engine will normally run with a lot of the sensors unplugged, but the check engine light will come on quickly. Some easy to reach ones: Mass Air Flow (MAF), Oxygen sensors, sometimes the throttle position indicator (on the throttle body). If you can unplug the power to the secondary air injection pump, it will cause a fun ...


6

Sourceforge has this scantool.net open source application. I have used it on my laptop with a USB to ODBII converter on various vehicles. You can google "USB to ODBII" and get multiple hits to procure this cable converter. Here is the LINK to the software download. It also comes with source code. Good luck.


6

No. The tool in and of itself cannot do any "harm" to the vehicle. If you were testing apps with the engine off, it is quite possible that the battery may have drained to the extent that it gave some hiccups while starting. Low fuel level may also be to blame here. However, If the vehicle has error codes present which are cleared with the tool, the ...


5

Just this morning I connected an ELM327 to a '05 Volvo XC90. After only 1km, the message was displayed for "Anti-skid service required", and then "Anti-skid temporarily unavailable". I removed the ELM, and went home, and checked the car on the laptop based Volvo VIDA/DICE. This showed a BCM fault, CAN network communication error with SAS (steering angle ...


5

There's a lot of work going on in this space, so the answer is "Yes, Of course!" Here is a Python project: http://www.obdtester.com/pyobd This looks like an interesting way to get data from the car, but doesn't seem to really be about trouble codes or diagnostics: http://openxcplatform.com/getting-started/index.html This looks very outdated, but maybe ...


5

To add to the list, run the engine without the fuel filler cap on.


4

1989 is OBD1, my favorite scanner for this vintage GM product is a Snap-On MT2500, you can find them on eBay fairly reasonable. Be sure the scanner comes with the GM1 aldl adapter, a Primary cartridge and a Troubleshooter cartridge and cables for your model year. You can short the proper pins (image below) to get the check engine light to flash any codes ...


4

These sensors look normal. Bank 1 sensor 1 should cycle about twice per second, this is a bit slow but fast enough to maintain normal fuel control. It is common for Toyota to cycle the system a bit slower at idle. It would likely cycle faster at a higher rpm. Perfect symmetric curves are not normal when viewed on a scan tool, the data sampling rate is not ...


2

I just had a problem using one of this OBD2 Bluethoot module on my Chevrolet Trax 2015, where my Traction Control System stop working (Engine and TCS dash lights came on), also the transmission wasn't able to shift gears. I even have to push the car back to the parking spot. No air conditioner, no MPH reading, no fuel efficiency info. Unplugged the OBD2 ...


2

I recently purchased a 'ebay' obd2 dongle. Plugged it into my 06 Mercury mountaineer, to check a CEL code. I was using the Torque app. Drove with it for a few miles and the Wrench symbol came up on my display. Truck went into a limp mode. I turned the truck off, removed the dongle and returned home. Next day used the truck and it was fine. Jump ...


2

No, it is not possible to get true values from OBD-II ELM327. You have to have a dedicated exhaust gas analyzer to figure that out, like this one: But you can estimate it using a lambda sensor Although I fear that the theoretical graph is not going to be very useful in the real world:


2

As long as we are talking about US spec "Asian" vehicles, my personal preference is one of the many "Autel" brand scan tools, which for me have always been able to link up and give good results. I have a 1997 Subaru which the Autel works well on. Keep in mind this vehicle uses a rare protocol, and is only one year past the 1996 US cutoff which mandated OBD ...


2

Depends on what you would like to do with it. If you just want to clear some generic codes and the check engine light, then most generic OBD2 cables should work with appropriate software. If you want to do more advanced things, like reading Volvo specific codes or changing available parameters then what you need is VIDA + DiCE. It's a Volvo diagnostics tool ...


2

A VIN (Vehicle Identification Number) code is unique to each vehicle - it gives all the information such as which manufacturing plant right down to which radio and speakers were fitted etc. If the scan tool you are looking at is limited to North American vehicles (which surprises me - most i checked were targeted at the manufacturers VW, Landrover, GM etc) ...


2

It looks like your scanner is only showing you values from the journey in progress - it's showing 0.53km driven at a speed of 4.23km/h. I'd suggest driving it a bit more before worrying. I'd also suggest measuring the actual fuel consumption yourself, then you can see how accurate the measurements are. Fill up the tank to the brim and reset the 'trip' meter....


2

I don't see how this is different from your previous question. No data is actively sent to the OBD port on late VAG vehicles as this in connected to a gateway and only responds to PIDs and manufacture specific data and codes hence why you can't 'sniff' anything on it. You need to access a CAN bus channel connected directly to a ECU/Module. Find the ...


1

EDIT: I spent more time reading into this, the individual manufacturer of the vehicle has a lot of control over this. The OBD2 DTC has some standard items but is not required to have a time stamp or indication of age, which is more-so what I think you are looking for in the raw data. I think the only way you can answer this question is having access to the ...


1

I couldn't find an open source scanner firmware, but we have solved the KWP issue that we were facing. Still open for any mention on open source OBD II scanners. I use the same GPIO pin as both GPIO and UART TX, which is what we must do. But when switching between that two modes the pin goes into high impedance mode and so there was a drop in voltage which ...


1

TL;DR: Unplugging the device while the firmware update is happening, even if the update is frozen, may make the reader break. But the reader can then be fixed by plugging it into a computer that can successfully update the firmware. If Windows isn't working try a Mac, if Mac isn't working try Windows. (they seem to work differently) There are 3 different ...


1

Based on what is mentioned in the question, an ideal code scanner should offer: access to stored codes (and the ability to reset them) access to freeze frames (and the ability to erase them) logging/graphing capabilities access to OEM-specific signals regardless of make affordability/value for money The first three can be addressed by universal OBD-II ...


1

If it has to be 'cheap' you do not want any proprietary hardware and software. So what you need is a basic ($15) USB or bluetooth enabled OBD-II scanner that can hook up to a laptop. The other thing you need is a look here: Any open-source OBD scanner analysis tools?


1

There are readers and readers - some readers will read many cars, some have to be tailored to specific makes (such as the one I had to get for my car). The professional readers have "character" cards to give the reader the correct info for a particular manufacturer. A reader such as for a VW caddy will not necessarily work on a Jaguar or a Toyota... Which ...


1

89 is OBD1 and requires specific connectors and a OBD1 scantool. You can jump pins A & B on the ALDL (Assembly Line Datalink Connector located under the driver side dash) to make the MIL flash out codes.


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