However, if you know youre way around checking the possible causes of this issue, you can save a lot of money, time, and effort. Design. Feb 20, 2007. The steps mentioned above should help you fix the issue if ever it happens to you. Well cover all these tests below, but before we do, well need the proper tools to make these tests. This way, you will have mechanics and technicians to properly diagnose your car if ever the OBD2 systems wont work. Just go ahead and buy a new cable. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. If you plug in to your OBDII data port and nothing happens, you need to find why. The OBD2 connector. We dont know whats going on inside them, and we dont really care. I hear it could be a cigarette lighter fuse, haven't checked it yet. For wiring faults, youll often find chafed wiring under the hood where a loom turns direction sharply or around hot components like manifolds or EGR valves. The scangauge get's its power from the OBDII port. Any ideas?? He completed his Automotive Specialized Training Course at Universal Technical Institute and has more than 15 years of experience in the field. (Explained!). How do I troubleshoot this problem? There are two grounds in the OBD port. If this is right, wouldn't the fuse. In general, such problems need repairs from a technician who knows his way on these parts. This way, you may physically check the fuse and dont hesitate to replace it if it actually blows out. Reaching into a vehicle, blindly fitting, or pulling the scanner cable is a normal everyday occurrence. Theyre not expensive. If the plug has power (+12V) but not good ground connections, it could affect the OBD2 interface. Both work in other cars (NZ new VAG cars specifically), but not on JDM toyotas. I have voltage on these line. 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). Moisture caused by water leaks is a common cause of failure. Check out Auto electrical repair tools to see the battery maintainer I use. I imagine this means the port has power and ground and the data lines are in some way messed up. Floor Jack VS Bottle Jack Features Comparison 2023, Autel IM608 Review-Most Advanced Key Programming Tool, Autel MS906TS Review 2023[Maxisys Diagnostic System Scan Tool], Autel MaxiCom MK808TS Review 2023 [TPMS Scanner], Autel MP808TS Review 2023 [Full TPMS Service Functions], Autel MK808BT Review [2023 Newest Diagnostic Scan Tool], Autel MaxiPRO MP808 Review 2023 [More Advanced Scan Tool], Autel MaxiCom MK908p Review 2023[Automotive Diagnostic Scan Tool]. As a mechanical engineer, its easy for David to explain the functionality of the tool. The readings between 1.5 and 2.5 volts indicate normal. Thus, if the OBD2 port fails to communicate, it is conceivable that the data link connecter has been broken or is malfunctioning. They contaminate the CAN network with constant erratic voltage. The system needs a 12-volt power source, so if the battery is dead or there is another problem with the electrical system, the OBD 2 system will not work. 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. But no spark or fuel when cranking through, good compression too. Assuming that the DLC and the fuse are functioning properly and your OBD2 is still not communicating, this is the most likely culprit. A visual test comes first. (Review & comparison), Autel MS919 Intelligent OBD2 Scanner (Only for Professionals) Review, Innova 5610 ABS/SRS/TPMS Scanner: Full Specifications and Review, Launch CR529 EVAP/Air/O2s/MIL OBD2 Scanner Honest Review, Innova 3020RS: Features, Buying Guide, and Review. Detaching these third-party systems would be the basic troubleshooting you can do. See the diagram above. I then took the dash apart to investigate and learned that the previous owner removed the check engine light. OBD II scanner I got from Walmart wont connect, nor does the Bluetooth OBD II scanner that previously worked with the car. Controllers, therefore, share information. You can move on to a possible problem with your vehicles OBD terminals, and thats what well look at next. If the interior of the fuse is dark as if it were a blown light bulb, or if the power lines within the fuse are burned apart and dont attach, then the fuse is defective. In most cases, these issues necessitate the expertise of a trained technician. If there is a bad fuse, you will continue receiving the error when you link the obd2 to the computer. Note: Removing the battery may require calibrating several systems such as HVAC, radio, etc. Also try unplugging the wiring connector to the ICP sensor (mounted on the driver's side head just behind the alternator) and see if it will start when disconnected. tried. Common scan tool problems will be front and center. Launch VS Autel: Which Brand is More Popular in 2022? For a variety of reasons, the OBD2 is critical to a cars operation. Place the negative probe on terminal 4 and the positive probe on the chassis ground and note the reading Repeat this for pin 5. (adsbygoogle = window.adsbygoogle || []).push({}); Saturday, November 17th, 2018 AT 12:29 PM. You may not have time to check if anything breaks down, but if it does, it can be frustrating. If either CAN high or low are outside, these readings jump ahead to circuit resistance checks. For instance, it may help you deal with the issue by doing these things: As I mentioned earlier, a blown-out fuse can be a reason why your OBD2 wont communicate despite having power. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Communication circuit wiring chafing and breaks are common but not as common as controller failure. Check terminal 16 and terminal 5 (signal ground) also. This isnt a measurable result. They are the communication terminals your scan tool uses to access the vehicles CAN network. Jun 28, 2008. 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. Have no power at pin 16 of obd2 port. I was kind of hoping that it was a simpler problem. TRY THIS! OBDLINK MX+ VS LX: What Are The Main Differences? Blown Fuse. If you've plugged into your car's diagnostic port and aren't reading anything, you might think that your OBD-II brain has been fried, but don't declare it dead yet. Your help would be appreciated. You should see +12V between pin 16 (+12V) and pin 4 (Chassis GND). As you know, modern vehicle electrical systems increasingly employ control modules to manage system functions. All by the way for a fraction of the cost of a new main dealer fitted unit. The fuse that has been blown out blocks the contact between the scan tool and device so there would be no communication. Sounds like the controller, BCM or PCM is/are getting ready to fail. 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. A few things to note: Did a search and found that fuse #41 is the fuse for the cigarette lighter and OBD II port. 13lovecar14 New Member . In this case, you may wish to look in the lighter port of your vehicle. You will need a few things to check it and make the repair. Was this answer helpful? If your OBD2 wont connect or communicate, you may want to do some things in response to this matter. Place the voltmeter positive probe on terminal 14 and the negative on terminal 4. wont communicate with your car so theres no way it can function. One of the most common causes of an OBD2 port not communicating is a blown fuse. OBD2 ports can have problems in communication, and it might be a pain if you encounter one. now he is working for a well-known company. The wire comes direct from that fuse and no other equipment or connectors are in-line. Any ideas please, like why it won't connect via bluetooth. Most of the time, its either a problem with the wiring or an issue with the OBD2 system itself. What is Dodges fix for the controller wheeler1 said: Just a precautionary note. Remember, back probing terminals are advised unless you have fine non-invasive probes. ), F1 Engine Cost: How Much Does An F1 Engine Cost? Maybe one of the grounds is defective and the tools are looking for that ground, while the bluetooth device may be using the other ground. Good bright flashlight Liquid tape / heat shrink / electrical tape Continuity tester / multimeter Wire (optional but helpful) striper / cutter Splices / Solder & Sodering Iron Pin out / wiring diagram About half a days time and a LOT of patients and flexibility. First, the OBD 2 system may not be properly powered. Let it sit for a while and now it won't idle or run without some serious mis-firing and racing idle. Continue with Recommended Cookies. 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. 3 CSS Properties You Should Know. Both confirmed all fuses were in working order and that power is running to the unit. first check for a burned out bulb, sometimes when they burn out the filament shorts to ground. Thus, it can be quite troublesome when it stops communicating. David test most of the tools before writing a review. (11) OBD2 Port Doesnt Communicate, But Has Power YouTube I replaced it and now the light stays on. As said at the beginning of this post, Ive assumed you have power in the scan tool, but it isnt communicating. Apr 28, 2011. All fuses are good. 1) get a digital Multimeter, and set it to volts DC. If it doesn't work, verify that you have B+ (battery voltage) to pin #16 of the DLC (Data Link Connector - OBDII port). But after conducting research online and speaking to different mechanics and technicians, I found out that a wide range of problems can cause it. Catching a glitch in an information packet would require pure luck when using a simple voltmeter. When you understand how it works and what to do if it ever happens to you, youll be more prepared. Everything passed, EXCEPT they could not connect to the OBD2 module. 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. Yes and relays. Computer Problem My problem is, when i connect the obdII reader, instead of activate, the screen start binking, and obviously nothing can be read. Turn signal lights (10A). 3 CSS Properties You Should Know. In addition, well check the resistance of the CAN network. These include but aren't limited to: Incompatible scan tool (Use a professional scanner) Blown fuse Corrosive pin Worn socket/pin Dirty connectors CAN network fault Wear and tear on connectors Broken scan tool In a nutshell, this component informs the owner or mechanic of your cars current system state. Controllers are connected via multiplexers which facilitate communication and the sharing of information. 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. The USB and handheld monitor, no issues, but the bluetooth doesn't seem to come alive with ignition turned on. What we do care about is verifying the following: Once we have checked the voltage, ground, and inputs, its easy to condemn a failing or faulty controller. The readings between 2.5 and 3.5 volts indicate normal. The information is processed by the EBM, and action is taken according to its software parameters. 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. EASY FIX! read more Greg Shop owner, technician Vocational, Technical or Tra. Afterward try checking the fuses and see if they are working fine. This causes a no-start issue. 9. Controllers are like black boxes. Test it with another car and see if it functions, if it doesnt, then probably, the issue is not with the scan tool. How Long to Wait Before Opening Radiator Cap, Volvo Engine System Service Required Message, F1 Fuel Cost: How Much Does It Cost To Fill F1? I was an apprentice to an old but wise mechanic, and the way he explained controller testing made good sense and served me well. 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. Both tests should read less than .2 volts. (11) SCAN TOOL WONT CONNECT? It is an Action Autoscanner Plus (CP9580A). .5 volts with all modules connected. The power is pulled from the pos and neg ports on the obd ii. OBD2 is a feature that is quite beneficial in the process of diagnosing a vehicle. Vehicle computers are known by several names and acronyms, and to make things even more exciting, manufacturers use their own names. Check the cable itself for damage, and check the plug at the scanner too. Innova VS Autel: Comparing 4 scan tool(2 from each brand), Foxwell NT624 Review 2022: Car All-Systems Diagnostic Scan Tool, Konnwei KW808 Reviews 2022: OBDII/EOBD code reader & auto scanner, Autel Maxicheck Pro Reviews: OBD2 for EPB/ABS/SRS/SAS/Airbag, Innova 3120 Review 2022 for OBD1 & OBD2 Vehicles(latest 3120e, 3120f), Autel Maxisys Elite Review 2022: Most Advanced Diagnostic Tool, Ancel AD310 Reviews 2023: Classic OBDII Car Engine Fault Code Reader, FOXWELL NT630 Review 2022: Plus Automotive ABS Scanner, Foxwell NT510 Review 2022: Automotive Scanner for ABS/SRS/EPB/Transmission, Foxwell NT301 Review 2022: Car obd2 Code scanner, Bluedriver OBD2 Reviews 2023: Professional Bluetooth Scanner. I have replaced the cam position sensor per advice from a local shop . As an alternative, consider shipping just your controller to a specialist control module repair centers, they will test and repair your controller without removing its software, and so once repair and returned in the mail its a plug and play type deal. But if you know your way around the various causes, it would be more efficient in the long run. Nov 1, 2011. Re: Unable to connect to Vehicle!!!!!!!!!!! It has got three lights on it, power, odb, and pc. Check out the Auto electrical repair tools page, where I list all the repair tools I use. These issues include an incompatible obd2 scan tool, bad fuses, damage in the circuit board, ECU, and failed computer. I checked for blown fuses, especially cigarette lighter as tech suggested. The OBD2 is a feature that helps a lot in diagnosing your car. However, once it malfunctions, it can also be a pain to deal with, especially if you have no time to check it. But if it has power but refuses to connect, you may want to examine its connection to the rest of your system. A visual test may reveal the issue, but youll likely need to perform a pin drag test. Read more, F1 Tires Cost (Not A Cheap Fun, Can You Get One Yourself? Once the fuse has been burnt, its inner would be roasted/blackened and cant be attached so it will fail the connection. In this case, you can start playing about with your cigarette lighter. I didnt test the other pins because i dont know what is suposed to read there. try powering down the phone then power it back up and connect to the elm327 device works here. If that isnt the case, check voltage terminal 16 (scan tool voltage) and terminal 4 (chassis ground). Won't start (trys) acts like crank trigger but replaced it and cam sensor. Thus, youll have to take it to a mechanic soon. When the scanner will not connect, usually the first thing we look for is a blow fuse or lack of power at the OBD2 connector. First, the ignition key must be in the run position. But in "car scanner" app it says vehicle is not responding in communication. In addition, one of the computers might be the problem. 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. A good number of motorists encounter this problem and usually dont know why it occurs. Cig lighter works but obd2 still doesnt. Checking your vehicles socket is a little more work but not much. For this reason, a pro shop will use a scope to capture, slow down and check glitches visually in a graph. 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. Ive also checked prongs inside the port and everything seems to look fine. dave5358. This, of course, is only possible if you have a good working wiring diagram. So, you may ask: If my OBD2 has power but wont connect, what should I do? It is common for car systems to use the cigarette lighter as a means of communicating with scanners or other diagnostic tools. David Richard founded weekly tools in 2018. he is a formal mechanical engineer. As a result, your OBD2 may not be able to communicate if the fuse in your cigarette lighter is blown. Yes No Saturday, November 17th, 2018 AT 12:29 PM ASEMASTER6371 EXPERT Also, they have a sort of analysis through their OBD generic tool. Next, well pin-drag test the terminals. 2012 Altima 2.5 S Sedan. I Replaced The Gas Cap And Air Filter. Cant connect to the ecm but the OBD2 port has power.