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Many of our customers have a huge problem with reading out Jeep Grand Cherokee 2.7 CRD fault codes. It is possible to see engine fault codes with key on-off method, but you can not clear faults without correct OBD diagnostic tool. Also disconnecting battery will not clear fault codes on 2.7 CRD Jeep Grand Cherokee.
Sometimes car will clear faults itself after replacing faulty part and driving couple of kilometers twice, but not always. Until today they were correctly read out and cleared only with DRB III and Bosch KTS diagnostic devices. Those devices are pretty expensive and not reasonable to buy for private use. So we decided to make a free diagnostics software that is compatible with 2002-2005 Jeep Grand Cherokee 2.7 CRD and that would work with a cheaper device. So we made our own diagnostic software and designed it to read/clear Jeep WJ CRD engine and transmission faults.
Our Jeep diagnostic software is very basic and is not comparable with professional diagnostic equipment. Our goal is to help the car owner to quickly view and erase fault codes without the need to run to workshop and pay money for it. It is mainly for people who sometimes like to fix their car in their home garage.
Our Jeep diagnostic software will never be sold for money, It is free forever – to everyone. For hardware we chose ELM327 diagnostic scanner as it supports all OBD protocols and is compatible with 99% of modern cars. ELM327 is also pretty cheap, genuine ELM327 that uses genuine ELM chip issued by ELM Electronics costs about 50 EUR, Chinese USB clone (non genuine) costs about 10 euros in ebay and every car owner can afford it. Current version is Windows based and works with ELM327 adapter. This new software can read engine and transmission fault codes and also cleared them. Other modules – ABS, Body, Instrument etc., are not supported. There is no explanation of the codes in the diagnostic program, it just shows what fault codes are stored in your car’s engine/gearbox.
You can check explanations at or just google them, there are a lot of tutorials on the web. Be mentioned that diesel and gasoline Jeep fault codes are different, so if you look from the web, then only look 2.7 CRD codes. Since this is Mercedes engine, many codes are same that in MB.
Be mentioned that diesel and gasoline Jeeps codes do not match – if you have 2.7 CRD, then do not look fault code explanations for gasoline models. Our Jeep fault code scanner is Windows based and should work on Windows XP and greater. We tested it on 32-bit XP, 64-bit windows 7, Windows 8 with versions and Windows 8.1 Tablet with genuine ELM327 BT version and it works perfectly.
This software connects with ELM straight to COM port and if you use BT version, then you should pair ELM327 and connect it with your computer before using our program. Also be sure that you have BT drivers correctly installed on your computer. You need to have Microsoft.NET Framework 3.5 or greater installed on your computer.
Most computers already have it. Android version working with Android 4.3 and up. There are problems with Chinese BlueTooth ELM327 clones. It is true that the ELM is only as good as it’s user. Genuine ELM is well made and can communicate through all OBD II protocols and is only limited by its user’s wisdom to use all ELM options. Different case is with Chinese clones – there are nice labels on those devices “Supports all OBD II protocols”, but real life is different. Newer Chinese devices are different from what they used to be.
They used to copy ELM chips, but now they made a new device with their own firmware for chips inside the device, added some major protocols and called it ELM327. Those devices do not support necessary commands for ELM configuration and some of them even does not support necessary protocols. Chinese devices are working with some diagnostic software like Scanmaster ELM or Torque PRO on many car models, but 2.7 CRD Jeep ECU and TCM data transfer is much more complex and newer clones are not supporting them. This is the reason why our diagnostic software does not work with many Chinese ELM327 devices.
Older Chinese USB clones seem to be working well with our software, problem is with Chinese BT and newer USB devices. We cannot do anything about this. With problematic ELM327 device you will get answers: Fake ELM. China is a country of surprises and you’ll never know what you get – working device or garbage.
At the bottom of this page you can find some feedback and we are pretty sure that those who can not get our diagnostic software to work, are using fake ELM device. Avoid Chinese ELM327 clones, they are not working correctly! ELM327 BT and USB with original chip are working fine. If you want to be sure, buy a device with genuine ELM327 chip. Configuration commands that ELM must support are: AT SP 5 AT FI AT WM AT SH You can ask about those commands from seller before buying Chinese ELM device. There are only a few places in EU where you can buy genuine ELM327 device. We found one from Romania and we bought one BT ELM327 device for testing.
Now we can confirm that this device supports all necessary ELM commands and works fine with our software. Here is an image of this ELM327.
It costs 49 EUR and for genuine chip this is pretty good price. You can check it from Same seller is also selling in ebay and his seller name is car.pulse Other seller we found is UK based.
Prices are a little higher and we have not tested their devices but they confirm that devices are using genuine chips by ELM Electronics. Website is Update We are finished with WJdiag Pro and uploaded it to Google Play. With WJdiag Pro you can access to every control unit of Jeep Grand Cherokee 2.7 CRD. Pro version has a lot of opportunities and can help with fixing any electrical problem. Pro version is available for purchase.
You can find short tutorial of WJdiag Pro from WJdiag Free will stay free for everyone. With free version you can read and clear Engine and Transmission fault codes.
Faults are shown with code and explanation. WJdiag is working only with BLUETOOTH ELM327 device. It does NOT work with WIFI ELM327. If you would like to get previous version of simple JeepDiag for Android, then it will stay available. With JeepDiag you can read and clear engine and transmission fault codes. Fault codes are shown without code explanation, but this tool is enough if you just want to clear them.
Works with Android 4.3 and up. Here are some images of Windows based JeepDiag: After opening a program just choose COM port where ELM327 is connected and you are ready to go. Turn the ignition to ON position. Reading Jeep fault codes will take a few seconds. There is no explanation for fault codes, you can only see numbers.
You can find explanation of fault codes from our site or look at correct explanation from google. There is a lot of forums where you can easily find help if you know correct codes. If you have trouble with connecting COM port or you see some unknown letter after COM port name (COM3n, COM4象 etc.) then check if the bluetooth drivers are installed correctly on your computer. Clearing Jeep transmission fault codes with our software is very easy.
![Software Software](https://www.filecluster.com/media/screens/264220.jpg)
It takes about 5-30 seconds, depends on how much faults your car has and if you are using genuine or fake ELM. If some codes are not cleared, then you will see it.
This means that your car still has something broken and you need to fix it. Here you can see how engine fault codes are displayed - only codes and no explanations. Clearing Jeep engine fault codes. After clearing the codes, you will see which codes were cleared and which not. And below are some images of Android based JeepDiag: Free Android version of Jeep Grand Cherokee WJ 2.7 diesel diagnostic app - JeepDiag is ready now. Android connection with ELM327 device is simple. After you click on 'Connect ELM327' all BT devices paired with your phone or tablet will appear.
Just choose the correct ELM327 device and you are ready to go. After connecting ELM327 you will see menu lines. Read Engine and Read Gearbox will read fault codes without deleting. Clear engine and Clear Gearbox will display fault codes and clear them automatically. Reading and clearing transmission fault codes with your android phone is easy with JeepDiag. As we made this app as simple as possible, then there are no explanation of codes inside JeepDiag.
To look what fault codes exactly mean, look at www.jeepswj.com/tips site Your Jeep fault codes will be cleared and you will see if any of the codes are not deleted - if some fault code stays, then problem is not fixed and you need to replace/fix broken part. Here you can comment our software. This form is only for commenting on how our program works, if it is fine or did some problem occur. We appreciate any feedback, even if our program will not work as expected.
In comment please specify what kind of ELM327 are you using, so everyone will know which version works and which not. All links of working devices are welcome as well.
All feedback will be displayed bottom of this page, so everyone can see them. For any questions, please use form on “contact” page. Injector test shows how good or bad injectors are. Perfect value for new injectors are near 0.00 and with time injectors will wear out. ECM is measuring RPM of each cylinder and if injector is worn out, then ECM will correct fuel quantity for each injector to keep engine running smooth.
Measuring must be done with warm engine, injectors must be equal, few examples: Some injector has +2 and some has -2.3, total difference is 4.3, it is too much and injectors should be replaced. Some injector has +2, other +1,8 etc., total difference 0,2 is pretty good, no need to replace injectors.
If injectors are not equal, then car can smoke, fuel consumption is high, engine is not running smoothly, in extreme situation car may not start. Total difference 2 or less is not a big problem and car can drive well. Injectors have codes 1, 2 or 3 stamped on case. To get best performance, same values should be coded into ECM, it can be done through Engine Tests, Injector Learn. Just place correct codes shown on right side and save.
There is a little trick to optimize fuel consumption with old injectors through changing codes in ECM. With warm engine drive on flat road with cruise and check fuel consumption on ceiling console.
Change code on injector you think is working incorrectly and compare fuel consumption again. To get correct results, fuel consumption must be reset from ceiling console every time you are measuring. With such playing fuel consumption can be reduced up to 2 L/100km (best result I know), depends on injector conditions. Of course results can be reversal if initial settings were most optimized, so better is to remember settings before coding.
Hi I have WJ Jeep 2.7 CRD 2002 year, with error code P0702. I bought a replacement PCB from a dealer in the UK (one of your boards) and fitted it, but the issue is still present (limp mode and engine managment light still on), I bought a Wi fi ELM 327 reader from the site recommended below and have used it with my I phone to try and clear the fault code (it immediately reappears) and read the error code using the Auro Doctor app. I am unable to get any fault codes using the ELM 327 reader and app. Do you have any ideas what can do please? Thank you Andy. Bonjour, I am very dissatisfied! I ordered and received usb elm 327 from Romania.
To connect to your software is impossible! Your software only offers one COM 3 port, and I can not connect to the PC. I have yet to download drivers usb on www.elm-327.eu/hsms.
The software tells me that I am not connected to com 3. How to do.???? It is a situation that costs me dear and that does not solve anything and that lasts in time!!! I tried with two pc (windows 7) and it's the same problem!! Thank you for following up on my message. My 2002 2.7 Jeep started to go into temporary limp mode almost every second day. It had done that for the last year or two but until now, it would only happen like once a month so I wasn't really concerned.
The check engine light would come on and the power would be limited. Restarting the car would instantly fix the problem until the next time. Doing the key trick I found out that I had quite a lot of codes with P0700 and P0702 being some of them. I managed to fix the limp mode problem just by cleaning the whole PCB board and the gear selector base that houses the magnets with cotton pads soaked in contact cleaner. I also sprayed contact cleaner on all of the connectors that where under the central console and had to be disconnected from the PCB board to remove it.
Just in case cleaned the TCM connectors as well. I think that the magnets were too dirty for the PCB sensors to detect the correct position of the gear selected but I might be wrong. Been happily driving my Jeep for a month now without check engine light turning on or the car going to limp mode.
Thank you Kaido for such a awesome website. P1685 is SKIM SYSTEM INVALID SECRET KEY IN EEPROM.
If you can start your car, then do not worry about this and focus on P0700 and P0702. If P0700 or P0702 is active and comes back after clearing, then there must be some other code stored in transmission that is causing P0700 and P0702. P0700 and P0702 are 'Transmission generic electrical' faults and they are stored in ECM (Engine Control Module).
They appear only if transmission has an active fault code. If transmission has some electrical problem, then fault will be stored in TCM (Transmission control Module) and also TCM will report about this to the ECM. By this report ECM will store P0700 or/and P0702. For this reason P0700 and P0702 can not be alone. Hi, My name is Samuel from Malawi Africa. I own a small business of renting and selling used 4x4s from UK market.
Latterly have sold many Jeeps with Diesel engines CRDs. Right now I have 10 Jeeps parked at my yards have various issues like Keys not recognized,immobolizers, gears limp modes etc I bought various diagnostic scan machines like launch, dvatage and the last one called DG VSI2554 I need soft ware that I can install in the machine that can handle issues of my Jeeps. Any idea please help.
I look so stupid to the people have supplied Jeeps of various models. I love these vehicles when running properly.
Yes, this message means that your ELM327 does not support necessary commands that are required for Jeep diagnose. It is a common problem for many Chinese devices. With genuine ELM327 chip all commands are supported and it will do the job.
Better is to get ELM327 with genuine chip, but you can try next Chinese device until you get working one, many Chinese devices are also working fine. For example Vgate iCar2 BT device worked well, but until manufacturer has not confirmed supported command list, we can not be sure that all Vgate devices work. Vgate is not very cooperative to answer to us, but we will keep on asking them. Hi, software works fine with iParaAiluRy ELM327 USB Interface bought on amazon: It has the PL-2303 XA/HXA chip build in, which only works on windows XP and Windows7, myself I use an Eeepc with windows XP. Engine and transmission errorcodes reading and erasing perfectly!!!
I´m looking forward for the android version. Many thanks to the developer, who made it possible to read and erase error codes on Jeep WJ/WG 2.7 crd!!! Hi, software works like a charm.
Used USB ELM 327 v1.5 Chinese clone. Bit of a gamble, but worked first time! Costs about 7 euro's on ebay which includes international shipping! Slow on arrival (takes about 2 weeks), but quality seems ok on first glance. Comes with driver CD, but didn't need that. Plug and play on Windows 7.
Able to read and clear two old codes from engine and reads transmission no problem. Ebay link: seller's name is is eto666 Order and use Chinese clones at your own risk, just sharing my personal experience with this particular product.