I replaced it and now the light stays on. (Explained). These issues include an incompatible obd2 scan tool, bad fuses, damage in the circuit board, ECU, and failed computer. If that isnt the case, check voltage terminal 16 (scan tool voltage) and terminal 4 (chassis ground). Use this website to help you locate the proper pins. 7,858 satisfied customers 2007 Chevy 4500. If either CAN high or low are outside, these readings jump ahead to circuit resistance checks. Because of this, you might want to inspect the cigarette lighter in your automobile. TRY THIS! For instance, it is a vehicles reporting capability and self-diagnostic function. My Service Engine Light Is On And The Diagnostic Plug Is Not Working. In most cases, it can be a cabling problem, or the OBD2 itself isnt working. 2012 Altima 2.5 S Sedan. 97 F250HD OBD2 won't connect - Ford Truck Enthusiasts Forums As a result, the cigarette lighter is one of the best ways to check your OBD2. Having mechanics and experts on hand in case the OBD2 systems fail is a good idea. It is considered manipulation, and it may prevent the car from communicating with the OBD2 testing equipment during the examination. Yes No Saturday, November 17th, 2018 AT 12:29 PM ASEMASTER6371 EXPERT All modern vehicles, for example, will have an ABS brake system. For example, the DLC may be destroyed or burned, it could be used to charge a device, or it could be put into an electrical outlet. Thus, one of the best ways to examine your OBD2 is through the cigarette lighter. A few things to note: Many a good tech has been caught out by jumping the gun and calling a perfectly good controller faulty, only to find the problem is still present with a shiny new spendy one installed. My OBD Port Isn't Working! What Do I Do? - ENGINE DIARY In most cases, the OBD2 wont work because it lacks electricity. Let me know if you have any questions. Kevin Nicholas is an automotive technician who is a genius at software and hardware-related issues. No Voltage or Low Voltage on Connector. maybe just replace bulbs or remove bulbs and see if that takes care of it ,if not look for a shorted wire. There are a few reasons the OBD 2 won't work despite power. OBD2 ports sometimes have communication problems, which might be inconvenient. Read this too awhile back. Harbor Freight Floor Jack Review: The Best 1.5, 2, 3 & Harbor Freight Motorcycle Lift Review 2022. Thus, youll have to take it to a mechanic soon. An example of data being processed may be a unique identifier stored in a cookie. If your OBD2 port is not communicating, you probably experience one of the following issues: A blown-out fuse is one of the usual reasons why an OBD2 port isnt communicating. See checking the Controller diagram below. EASY FIX! Some of the common controller names include Control modules, Controllers, Computers, CU, CM, Modules, and Microprocessors. I tested pin 16 and reads 12 v, also tested pin 4, end there is a good grounding. a. Try logging on to your scan tool makers website. They dont work in isolation. Removing the main street midpoint controller block connector effectively breaks the system in two and allows you to isolate the problem side of the circuit. Your car dealer or your units service center may be able to help if your OBD2 port problem persists. A visual test comes first. I have to go in using Global OBD2 which doesn't give me much information. Shown is your OBD2 connection above (I can't recall if the diagram is the female or male connector, so the pins may be reversed). Any ideas please, like why it won't connect via bluetooth. What is Dodges fix for the controller wheeler1 said: Just a precautionary note. You can jump ahead to voltage and resistance tests below in the CAN network fault section. This way, you can check the fuse and change it if you see that it blew out. Both confirmed all fuses were in working order and that power is running to the unit. Therefore, once the corresponding port cannot communicate, it is almost certain that the DLC is severely damaged or malfunctioning. All fuses are good. Launch VS Autel: Which Brand is More Popular in 2022? Always follow safety procedures and understand the legal implications of any modifications you might make to your vehicle. Let's say your Jeep Cherokee won't start if the battery, starter, gas tank, and fuel pump aren't in good condition. Youre still able to use an OBD2 scanner to see if there are any DTCs stored in the DTC memory if the car is cranking but wont start. The Disturbance of Third-Party/Aftermarket Devices, Check The Third-Party Device Installation, Get Help from Manufacturer or Professionals. In this technique, you may inspect the fuse and replace it if necessary. OBD2 Port won't communicate | TDIClub Forums its help him to learn something new and suggest the best product for you. Cant connect to the ecm but the OBD2 port has power. I suspect that one of two things are happening to you: 1. His in-depth OBD review articles help people choose the right product, whether it is a European, American, or Asian vehicle. PCM not communicating with OBD scanner? | DodgeTalk Forum For example, the DLC may be destroyed or burned, it could be used to charge a device, or it could be put into an electrical outlet. My name is Hank, and I've been in the automotive industry for 27 years. The information is processed by the EBM, and action is taken according to its software parameters. The most common causes of communication problems are connector voltage fluctuation, incompatible communication protocol, defective or missing data, a hung ECM, or OEM-updated ECM software that the OBDII scan tool cant recognize. The PCM (Powertrain controller manages engine and transmission) uses basic data like vehicle speed to perform timely fueling or gear change decisions. I have a will crank but no start. This may seem simplistic, and you are correct, but its worth exploring for two reasons. OBD2 ports can have problems in communication, and it might be a pain if you encounter one. Any OBD computer tech support advisories and servicing plans should be examined. Usually when a "PCM" fails your while driving it will keep your engine alive until you shut it down but will not restart. Check terminal 16 and terminal 5 (signal ground) also. Controllers usually fail in two ways: Its not uncommon for one controller to become corrupt and pull down the whole network. YouTube, Maximize Your Cars Potential with Foxwell NT710 Scanner, ANCEL V6 Plus OBD2 Scanner A great value for the price. Thats important to know for later when well be testing circuit resistance. Pay particular attention to terminals 6 and 14. Any ideas?? 13lovecar14 New Member . Checking these connections will make sure that the onboard diagnostic computers power and network wont be disturbed by those third-party installations. In the event that communication ceases, it might be extremely frustrating. 3)Put your positive lead to pin16. Some distributors of aftermarket systems, such as radio systems, surveillance systems, communications systems, and so on, are powering the stereo or other third-party gadgets via the DLC or OBD2 port wire harness. In addition, well check the resistance of the CAN network. You can ensure that the OBD computer and its power and connection supply will not be interfered with by inspecting these connections. ), F1 Engine Cost: How Much Does An F1 Engine Cost? If there is a bad fuse, you will continue receiving the error when you link the obd2 to the computer. Scan tool (3 different ones) won't link with the ECM. Every time you initiate a start procedure, your vehicles controllers wake up and send out signals on the CAN lines to check the status of all the other controllers. I have a tech 2 and a smaller Mac the obd2 port has power and ground but will not connect. The cable connector is keyed and will only fit one way. Q: Obd2 scanner not linking - Yourmechanic.com OBD2 Port Doesn't Communicate, But Has Power DCF GARAGE 4.05K subscribers Subscribe 87K views 1 year ago In this video I fixed the OBD2 port on a friend's Cadillac DeVille that was not. In this case, you can start playing about with your cigarette lighter. Everything passed, EXCEPT they could not connect to the OBD2 module. Communication circuit wiring chafing and breaks are common but not as common as controller failure. Detaching these third-party systems would be the basic troubleshooting you can do. The bluetooth dongle gets power, but won't connect to the ECU. (Explained!). But the BCM may also share information about ABS activation. Have you ever gone to use a scanner on your car, truck, or Jeep only to find out it would not work? Even if it has power, it won't communicate if the fuse blew. How to Design for 3D Printing. I have replaced the cam position sensor per advice from a local shop . Floor Jack VS Scissor Jack? Generally speaking, if your DLC and fuse are working properly, its most likely this one thats causing your OBD2 to stop communicating. Except for the battery ground at pin 4 and battery positive at pin 16, all OBD-II pinouts utilize the same identical connector. They are twisted because that helps reduce interference from other wiring circuits. Obd2 Port Doesnt Communicate But Has Power - Otosection OBD2 scanners won't connect to JDM 9th gen corolla Copyright By Weekly Tools | All RIghts Researved 2023, As youre reading this article, you might have wondered why your OBD2 scanner wont connect even though it already has power. A wiring diagram will be needed for some of these tests as to how the CAN network is wired will predict some of the readings we should expect. Can you recharge a car battery with a jump starter? If it persists despite your efforts, youll want to take it to a service center since it can be a more complicated problem. Jeep Cherokee Won't Start But Has Power, Causes #5: Defective Spark Plug. Were using our ability to feel the difference in tension from one terminal to another. In a nutshell, the OBD2 plays an important role when diagnosing problems in your car. Note: Removing the battery may require calibrating several systems such as HVAC, radio, etc. (adsbygoogle = window.adsbygoogle || []).push({}); It powers on when connected, tries to communicate with it, but then eventually it says that it can't connect and to check the connection. For this reason, your OBD2 must connect. Controllers, therefore, share information. I have a tech 2 and a smaller Mac the obd2 port has power and ground but will not connect. It Was Code Po440. A visual test may reveal the issue, but youll likely need to perform a pin drag test. 5 Ways to Connect Wireless Headphones to TV. 3 CSS Properties You Should Know. The onboard diagnostic (OBD) computer cannot be connected because the data link attachment (DLC) is damaged or interfered with. As a result of this, your OBD2 must be plugged in. I recently went to get an inspection and I ended up failing due to the fact that my OBD-II Port will not communicate. Im passing it on. HELP--OBD II Scanner No Link!!! - The Nissan Club Has the 6.6 Duramax in it. Obd2 power but will not connect. Hooking up the scan tool only to be greeted with no communication is frustrating!!! The USB and handheld monitor, no issues, but the bluetooth doesn't seem to come alive with ignition turned on. Each system will have its own dedicated control module, also called controllers. It is an Action Autoscanner Plus (CP9580A). 4. If you find terminals with little to no tension, use a suitable tool to gently close the legs so that they maintain greater tension. With the voltmeter set to volts. Do not connect to the body or chassis ground but to the battery terminal directly. Another way of identifying what the cause or the no linking could be is by testing pin to pin check with a wiring schematic while utilizing a voltmeter to inspect every single wire. 9. But if you know your way around the various causes, it would be more efficient in the long run. Because CAN network language uses voltage drops to communicate, they are super sensitive to changes in voltage; in other words, they are super sensitive to circuit resistance. I try with another reader with the same result. Issue is I can not get a code reader to connect to the Jeep. You may not have time to check if anything breaks down, but if it does, it can be frustrating. Has the 6.6 Duramax in it. Power to the OBD2 port seems fine as scanners will power up, and I've checked various (but not all) fuses in the 3 locations (under hood, passenger footwell, trunk). As said at the beginning of this post, Ive assumed you have power in the scan tool, but it isnt communicating. If voltage is greater than 0 volts test for short. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. The fuse for the OBD II is the same one for the cigarette lighter socket. OBDII no reading but have power at port | S-10 Forum We dont know whats going on inside them, and we dont really care. In most cases, these issues can be rectified and amended to allow you to read the error codes. Because of this, youll need to know how and why it occurs. Reaching into a vehicle, blindly fitting, or pulling the scanner cable is a normal everyday occurrence. This way, you will have mechanics and technicians to properly diagnose your car if ever the OBD2 systems wont work. However, you may save a great deal of money, time, and effort by being aware of the probable reasons of this problem. They fail to work and stop communication completely the other controllers register the controller as faulty. Responsive Grid Layouts With Script. Turn signal lights (10A). Having a scope does make capturing intermittent issues easier. I do my best to provide the most accurate and complete information possible, however, I shall not take any liability for property damage and injury occurred as a result of any information contained in this video. by Todd Ector Sat Apr 08, 2017 4:23 am. Checked all fuses. Im not going deep into the weeds here, I realize you simply want your OBD to connect, but a little background info is useful for later when well be running some tests. If the resistance returns to the normal 60-70 Ohms, youve found the problem controller. Obd2 connection issue | Jeep Garage - Jeep Forum The scanner you are using may simply not be compatible with your vehicle. Yes and relays. 2004 - 2008 Ford F150 - OBD2 port not working. Re: Unable to connect to Vehicle!!!!!!!!!!! The BD programer powers up when you plug it in,but it doesn't make it past. OBD2 reader won't read | Jeep Wrangler TJ Forum But after conducting research online and speaking to different mechanics and technicians, I found out that a wide range of problems can cause it. See the diagram above.
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