obd2 has power but won't connect

All fuses are good. If the scan tool does not receive data from an OBD II vehicle TEST 1: Connect the positive DMM lead to DLC pin 4 and the negative DMM lead to the negative battery terminal, using jumper wires if necessary. Pay particular attention to terminals 6 and 14. Blown Fuse. The following tests arent complicated, and most of the checks are easy to do. I can jump across the fuel pump relay to get it on it has 55# pressure. Even if it has power, it won't communicate if the fuse blew. He completed his Automotive Specialized Training Course at Universal Technical Institute and has more than 15 years of experience in the field. Use the min-max voltmeter function to capture the max voltages and min voltages. Chked the fuse and owners manual calls for a 20A fuse and has a 15a installed(not sure why this is). BlueDriver VS BAFX [Best Wireless Scanner for Your Needs ], BlueDriver VS OBDLINK Scanners Comparison in 2023, FIXD Reviews 2023[Bluetooth Scan Tool for iPhone & Android]. As a result, your OBD2 may not be able to communicate if the fuse in your cigarette lighter is blown. This terminal should be powered at ALL times. Look up the code and its a low coolant level. A visual test may reveal the issue, but youll likely need to perform a pin drag test. Save Reply Quote 07 charger srt8 Registered If fuse #22 is ok and pin #16 of the DLC has power, then check fuse #22. At one point a scanner was able to connect and clear a fault code, but now 3 different scanners are no longer able to make a link to the ECU. One of the most common causes of an OBD2 port not communicating is a blown fuse. Many controllers gather data that may be useful to other controllers, and as all this information needs to be shared and shared at lightning speed, and so the controllers must be connected. Apr 28, 2011. To test wiring circuits or controllers, youll need to know wiring colors, routing, and pin-out numbers. You can try some troubleshoots below based on the problems weve previously explained above. Its eyes on eyes. In short, this part gives the owner or the mechanics the current status of your cars system. Thats when the third-party devices are still connected and take over the ports functions. Have power at obd and can connect scanner pats will connect but wont connect with engine, Crank no start, Thats all as - Answered by a verified Ford Mechanic. Hooking up the scan tool only to be greeted with no communication is frustrating!!! A blown fuse is often the cause of a scan tool that simply wont power up. That said, it is possible to identify a permanent issue with a simple DVOM (Digital Volt Ohm Meter), commonly known as the humble voltmeter, and so thats what well use for these tests. Or check out the Amazon auto repair tools link below. Finding a problem with the plug or cable is easy to fix. You can try some troubleshoots below based on the problems weve previously explained above. Feb 20, 2007. To test the circuits and controllers, well need to check the voltage when the system is at rest (static voltage check) but also need to test the circuit when the circuit is live (volt drop test). Computers are great most of the time, but when they dont work, theyre a pain in the jacksie. 3. For instance, it is a vehicles reporting capability and self-diagnostic function. In short, if both the DLC and the fuse have no problems, this one is likely the reason why your OBD2 wont communicate. They are twisted because that helps reduce interference from other wiring circuits. The power is pulled from the pos and neg ports on the obd ii. An example of data being processed may be a unique identifier stored in a cookie. Most OBD2 wont connect because it has no power. Aug 22, 2013 #13 1. Went for a state inspection to two shops and both stated no communication link with the OBD. In many cases, this may require a bidirectional scan tool. The Ancel automotive supplier company has been in business for decades, supplying the best car troubleshooting scanner. This is why I believe you just have a dirty contact somewhere. What is Dodges fix for the controller wheeler1 said: Just a precautionary note. "turn key to on position". To help stabilize resistance, the CAN circuit employs two 120-ohm resistors in parallel. Sounds like the controller, BCM or PCM is/are getting ready to fail. All modern vehicles, for example, will have an ABS brake system. Dec 20, 2014. Is It Possible Throttle My Check Engine Light Was On Three Weeks Ago. Read more, F1 Tires Cost (Not A Cheap Fun, Can You Get One Yourself? I would start trouble shooting the back-up light system. As a result, youll need to get it serviced shortly. David test most of the tools before writing a review. It works on my other cars. So, you will need to check the main ECU. he is a prowed father of her little angel. There are a number of ways to deal with the problem, including the following: If your OBD2 isnt communicating despite having power, a blown fuse may be to blame. Saturday, November 17th, 2018 AT 11:54 AM, Saturday, November 17th, 2018 AT 12:04 PM. This isnt a measurable result. In most vehicle units, the vehicles mechanism for communicating with testing equipment is powered by a particular channel as the cigarette lighter. Generally, taking your OBD2 to a mechanic is the best option for getting it fixed. When you understand how it works and what to do if it ever happens to you, youll be more prepared. There could be various possibilities that make your OBD2 port not work properly but the problems are typically related to the OBD2 fuse, aftermarket system. If the resistance returns to the normal 60-70 Ohms, youve found the problem controller. The bluetooth dongle gets power, but won't connect to the ECU. # 9. The resistors are commonly controlled module integrated but may also be embedded in the circuit. A battery with min 12.5 volts should be maintained. But if it has power but refuses to connect, you may want to examine its connection to the rest of your system. But after conducting research online and speaking to different mechanics and technicians, I found out that a wide range of problems can cause it. The jeep has been running . Non-communication issues happen in OBD2 ports, and it can be a hassle if you experience such. In general, such problems need repairs from a technician who knows his way on these parts. Read this too awhile back. 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). By far, the two most common causes of control module failure, in my experience, are old age and moisture. Thus, if the OBD2 port fails to communicate, it is conceivable that the data link connecter has been broken or is malfunctioning. The readings between 1.5 and 2.5 volts indicate normal. The fault could also, of course, be a wiring issue between the suspected faulty controller and the network. In addition, well check the resistance of the CAN network. You have a bad windows driver, a extremely common and annoying problem when dealing with USB to com port adapter IC's. Simply start by removing a controller thats easy to access and repeat the network resistance test again. As a result, your OBD2 may not be able to communicate if the fuse in your cigarette lighter is blown. 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Number one, it only takes a few moments, and number two, while not being the most common cause of a scan tool that wont communicate, it is by far one of the easiest fixes. Feb 5, 2010. (The device was tested on 2000 Boxster 986 and works just fine). Several factors beyond my control might change the information provided in this video. Design. Locate the vehicle's 16-pin Data Link Connector (DLC). I read at obdii site that some obd2 it's not a real obd2 compatible and this type comes at older model around 1991 - 1996 . Im passing it on. My Car: Chevrolet TrailBlazer, 2006 motor 6L. This will keep those devices or systems running even when the car is parked and the ignition is off. 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. If you still cant find the issue regarding the OBD2 port, you may want to contact your car dealer or your units service center for assistance. Manage Settings You may locate the spark plug wires by opening your Jeep's hood. The readings between 2.5 and 3.5 volts indicate normal. 3)Put your positive lead to pin16. Wear and tear and front probing cause the terminal legs to lose tension. I've worked for GM, Jaguar, Land Rover, Volvo, Audi, and VW main dealers. They contaminate the CAN network with constant erratic voltage. [on edit: RT already suggested that] Also check for oil in the sensor connection. 13lovecar14 New Member . Im aRed Seal-qualified Auto Service Technician with over twenty-fiveyears experience working on Classic and Modern Cars. Ive also checked prongs inside the port and everything seems to look fine. Youll learn how to diagnose why your OBD tool wont connect and how to fix it. A strong battery is critical. i thought that was pretty stupid, but i dont remember what number it is so look it up in the manual. If all controllers talk at once, messages are lost. The Disturbance of Third-Party/Aftermarket Devices, Check The Third-Party Device Installation, Get Help from Manufacturer or Professionals. I tested pin 16 and reads 12 v, also tested pin 4, end there is a good grounding. But identifying this is very difficult as a result of the data transferred between the two controllers. You can make some voltage checks of the OBD2 pins and see if anything shows up. 2) get two t-pins (can be found at radio shack normally) and insert them into the OBDII connector at locations for pin5 and pin16. If the scan tool does not receive data from an OBD II vehicle TEST 1: Connect the positive DMM lead to DLC pin 4 and the negative DMM lead to the negative battery terminal, using jumper wires if necessary. However, you may save a great deal of money, time, and effort by being aware of the probable reasons of this problem. I recently sold my 1998 forester and got a 1999 in near perfect condition.. issue is on my way home from picking it up the CEL came on. Was this answer helpful? Any suggestions?? You may also want to examine the wiring of any third-party tools or accessories that you have installed, as these can cause problems if they are not correctly placed. 5 Ways to Connect Wireless Headphones to TV. So, I went to get my '97 Camry (V6 XLE) inspected today. If this happens again and you get "no bus" when ignition on, write me asap. My problem is, when i connect the obdII reader, instead of activate, the screen start binking, and obviously nothing can be read. I've gone through the pins and found this out Pin 4 and 5 are working fine Pin 16 has full battery power Pin 14 and 6 have 2.5v coming out try powering down the phone then power it back up and connect to the elm327 device works here. Some may be more challenging than others, not because of complexity but because some controllers may be difficult to access. There are a few reasons the OBD 2 won't work despite power. (11) SCAN TOOL WONT CONNECT? Home - Cars - OBD2 Has Power but Wont Connect: What to Do? Thus, youll have to take it to a mechanic soon. EASY FIX! 2012 Altima 2.5 S Sedan. Check that it contains the latest software. There are a number of reasons why the DLC can fail, including as being damaged or burned, being used to charge a gadget, or being plugged in. Scan tool (3 2007 Chevy 4500. Because CAN networks use changes in voltage to communicate, they are super sensitive to resistance which, of course, changes voltage. If, however, your scan tool won't even power up when you hook it up, then check out this post, "OBD scanner won't turn on" it covers the simple fix in detail. Do not connect to the body or chassis ground but to the battery terminal directly. P pcausey Registered Empty cart. Generally speaking, the Obd2 Scanner With Live Data cannot connect to your vehicle because the DLC has been damaged or something has interfered with it. Craftsman 3 Ton Floor Jack Review: Is it Worth Buying? You should see +12V between pin 16 (+12V) and pin 4 (Chassis GND). As a result, the cigarette lighter is one of the best ways to check your OBD2. The OBD2 port should sits underneath the fusebox, the sides runs diagonally, and it has 16 pins. Also, they offer an OBD generic tool that does some sort of analysis. A blown fuse is often the cause of a scan tool that wont power up. Some of the common controller names include Control modules, Controllers, Computers, CU, CM, Modules, and Microprocessors. If you notice any of the following problems with your car, call your local dealership or service center and ask them to investigate. I Was Told To Check Just Bought This Car For My Daugher And It Won't Always Start. Also, they have a sort of analysis through their OBD generic tool. wont connect to your vehicle, youd need to take action but they have to be the correct ones. 05-22-2011, 08:53 AM. obd2 has power but won't connect. Most controllers are wired in series, with sub-controllers (Side streets off the main street); knowing which module is on main street and which is a side street is crucial to efficient resistance testing. YouTube. 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. An OBD2 tester may not be able to communicate with the car during an examination if it detects manipulation. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. This content is owned by moc.sotuaytsur. As a result of this, your OBD2 must be plugged in. Get in touch with your local service center or dealership using the VIN number on your vehicle. The onboard diagnostic (OBD) computer cannot be connected because the data link attachment (DLC) is damaged or interfered with. Depending on how your CAN network is wired. Controllers, therefore, share information. Any OBD computer tech support advisories and servicing plans should be examined. Both tests should read less than .2 volts. This, of course, is only possible if you have a good working wiring diagram. If it doesn't work, verify that you have B+ (battery voltage) to pin #16 of the DLC (Data Link Connector - OBDII port). You have entered an incorrect email address! read more Greg Shop owner, technician Vocational, Technical or Tra. Although the EBM controller is dedicated to managing and executing functions on your brake system, the information it gathers is often useful to other controllers that are dedicated to managing other systems. Thats not to say we disrespect kit or customers vehicles, but working on a workshop floor is all about speed. 3 CSS Properties You Should Know. TRY THIS! OBD2 Has Power but Wont Connect: What to Do? Scan tool (3 different ones) won't link with the ECM. The most common reason for getting no OBD code is simply a blown fuse. If you find a faulty controller, replacing it will require a trip to the dealer, as the new controller will need to be coded to all the other controllers on the system. 8. Common causes? Test it with another car and see if it functions, if it doesnt, then probably, the issue is not with the scan tool. Checked all fuses in the glovebox compartment already. OBD2 problems can be fixed most effectively by taking them to a mechanic. Have you tried either Vol-FCR or Brick-Diag Free v0.0.6.6 with a **not**-ELM327, "dumb", straight-thru cable that connects to at least pins 7 . I Tried To Get My Saturn Inspected Yesterday, But It Had Been Sitting In Front Of My Parents House Unused For 3 Months And The Battery Was No Power, Push On Gas The Rpm's Go Down. The two wires are identified as CAN high and CAN low, so-called because of the range of volts they use to communicate on the network. 3. Use this website to help you locate the proper pins. 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. The other controllers and scan tools cant understand this constant gibberish and simply dont get a chance to shake hands with the other healthy controllers, as the CAN lines are always busy. As youre reading this article, you might have wondered why your OBD2 scanner wont connect even though it already has power. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Let's say your Jeep Cherokee won't start if the battery, starter, gas tank, and fuel pump aren't in good condition. Can You Jump Start a Car With a Bad Starter, How to Use Jumper Cables to Start a Dead Vehicle, (11) OBD2 Port Doesnt Communicate, But Has Power YouTube, (11) SCAN TOOL WONT CONNECT? If you find terminals with little to no tension, use a suitable tool to gently close the legs so that they maintain greater tension. Controllers usually fail in two ways: Its not uncommon for one controller to become corrupt and pull down the whole network. In a long-winded way, Im saying your vehicles OBD connector, also known as the DLC (Datalink connector), may be damaged from possibly years of OBD scanning and, dare I say it, Front probing.. OBD2 ports can have problems in communication, and it might be a pain if you encounter one. CAN networks, as you know, connect all the controllers together using a twisted pair of wires known as the CAN lines. In this technique, you may inspect the fuse and replace it if necessary. John uses his know-how and experience to write fluff-free articles that help fellow gearheads with all aspects of vehicle ownership, including maintenance, repair, and troubleshooting. If you need an inexpensive scanner that does the job, check out the Topdon vs. Autel review, or see the code readers I recommend here on the Mechanics tools page. Or check out the Code reader Amazon link below. See checking the Controller diagram below. Cant connect to the ecm but the OBD2 port has power. Inspection was due on 3/1 and my wife needs to drive this, cannot afford dealer mechanic troubleshooting. On many cars, the engine control module (ECM)also called the engine control unit or electronic . Check terminal 16 and terminal 5 (signal ground) also. When connecting my OBD2 dongle to the obd2 port it gets power and my phone connect to the adapter perfectly. OBD2 becomes unable to communicate properly once that fuse of the lighter port has been blown out.

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