The CEL has been on a while because the scanner has stopped linking like it had before. Well, at least thats what the service guy told me. There is one wire that is called the "Communication line" that the connects the OBD connector to the Powertrain control module. There must be a wiring problem somewhere. For some reason I have two OBDII units and neither one will communicate with my two Hondas: 2007 Odyssey, 2011 Accord I understand Honda uses OBDII with CAN protocol. They just work if they are correctly compatible with the CAN protocol. Check your fuses and replace any that are blown. Now the scanner is connecting! On Board Diagnostics, OBD-II, is required on all automobiles and light trucks in the United States from 1996 onward. First thing I would check for a communication loss is to make sure you have B+, ground and ecu ground as shown below at the obd2 port. 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. How Much Does a Powertrain Control Module cost, 4 Easy Steps to Diagnose your Engine Computer (PCM/ECM/ECU Control Module). I finally got a 10 mm socket to disconnect the battery to reset the CEL. 14. ADDITIONAL INFORMATION: Old PCM is fried, see the attached picture when attempts are made to communicate after fixing the wiring problem. The 5v output from the PCM is critical to getting communication functions from the various sensors as well as data to the OBDII port & cluster. The cheaper ones are flaky at best. OBD-II is a set of specifications for monitoring and reporting on engine performance in modern automobiles. So I made sure both units are compatible with CAN protocol. What Is OBD? One Key Starts, Two Others Don't. Went to have the car inspected and it failed because the OBDII port was not communicating. 4. 2004 ford f150 when i plug in the obd2 into the cars computer port does not communicate with the obd code computer The 2004 is a CAN system not OBD-2. OBD2 not communicating. Probably a broken wire. obd 2 pinout for GM cars. Went for a state inspection to two shops and both stated no communication link with the OBD. Show them> Should be suitable for most modern GM cars - Buick, Cadillac, Chevrolet, Daewoo GMC, Holden, Opel, Vauxhall. With the Ignition on, the voltage on class 2 serial data pin should be 5V or fluctuating between 3.5V and 5.0V, If open, PCM cannot transmit data to the scan tool. 5. NOTE: An open circuit or high ground resistance means that the PCM will never enter diagnostic mode. You can find the connector in one of these places depending upon the car model: Under the glove department. First thing I would check for a communication loss is to make sure you have B+, ground and ecu ground as shown below at the obd2 port. He wanted $95 to diagnose the problem on top of the $53 for the smog test. Had a wire that broke inside the jacket. Check engine light is on, and the code showing before the obd 2 connector stop communicating was about a speed sensor. Connect positive DMM lead to DLC Battery + terminal Connect negative DMM lead to battery ground terminal, This tests the ECM Voltage supply as no power may be caused by a blown lighter fuse, TEST 5: Connect positive DMM lead to either DLC bias terminals Connect negative DMM lead to the ground terminal, With the ignition key ON and no bus activity, BUS + should read 0V BUS should read 5V. It looks like the cover is just a cover and not part of the PCM but I don't want to go ripping it apart without being sure. Most GM cars produced in 1996-2003 use J1850-VPW interface. Afterwards, try checking the fuses and see if they are working fine. This pinout is associated with 47 compatible devices or models. The second smog station (a test only station) ran the test 3 times and he told me, he has the lastest software update for this system. The Cigar and Aux fuses are good. This will not effect the way the car runs at all because it is just for communication. A computer in your car monitors sensors that measure such things as engine temperature, exhaust gas mixture, and other metrics that would mean very little to you unless you're a serious automotive troubleshooter. 2nd: 2 weeks later, General mechanic with a shop said his scanner was unable to communicate with the computer. The grey plug inside the fusebox is the CONSULT port, it is rectangular in shape, and has 14 pins. There are no tricks. The OBD2 connector is near your steering wheel, but may be hidden behind covers/panels; Not all male connectors fit all OBD2 female sockets - check the type and OBD port pin-outs; Pin 16 supplies power via the car battery - often also while the ignition is off The most common reason for getting no OBD code is simply a blown fuse. Jump to Latest Follow 1 - 6 of 6 Posts. If you do have power and ground at the connector and at the PCM you either have the wrong computer or a … TEST 3: Voltage check on DLC pin 2. Autozone usually says its P0456 very small EVAP leak, but has given P0455 medium leak once. Blown Fuse. 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). OBD 2 was fine when wires were cut. The 5v output from the PCM is critical to getting communication functions from the various sensors as well as data to the OBDII port & cluster. It uses the same connector but it uses a different signalling to communicate. Sullivans confirmed all their readers worked on it and could read the vin, but the state computer wouldn't work on it. Wish you luck. The scanner works on my other vehicles. With the ignition on, the voltage drop across the ground terminal should be 0.1 Volts or less. I've checked the fuses an they are good, I took out the OBD socket an checked the pins and they are all clean and tight, so now I'm outta ideas.. Some pre-2001 petrol vehicles and pre-2004 diesel vehicles have a 16-pin connectors but they may not be OBD-II or EOBD compliant. The SKIM module uses communication with the PCM through the same PCI bus link as the cluster & OBDII port so not sure how (if) they were able to program it. ADDITIONAL NOTES PCM receives battery voltage (B+) through a fuse or fusible link. I bought a Foseal code scanner that reads CAN, ISO9141, J1850 VPW, J1850 PWM, and KWP2000, and replaced fuel cap. 2013 Honda CR-V Polished Metalic EX-L with Navi . I failed inspection (suprise to me) today because my OBD will not send my info to the NJ Inspection Station's computer.. neither will my buddys Android OBD reader or Advance Auto's reader.. The common issue with the cigarette lighter fuse doesn't seem to be a problem with this car as all 20A fuses I checked were good. Throttle is off after i disconnected battery to reset computer. What to do if the OBD II scanner doesn’t communicate with the vehicle. Yea that was the first thing I checked. First unit: CAS804 Auto Scanner Tool OBD 2 … He wanted $95 to diagnose the problem on top of the $53 for the smog test. An open ground or power (B+) circuit on a fuel-injected engine removes power from the ECM and prevents the engine from starting. However, I will take a look again when I get home tonight. You will need a few things to check it and make the repair. 0. Time consuming! If this wire is shorted or broken, the scanner will not be able to read the computer. I don't know if it's still true or not, but not very long ago on a lot of vehicles it was common place to tie the OBD2 diagnostic port and the cigarette lighter or power point both into the same fuse. When I use this smilie ===> :stupid: I am NOT calling you stupid. Norm _____ 2012 CTS-V Coupe, 4k miles and counting. It is not communicating at all what can I do to fix this problem? By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. The SKIM module uses communication with the PCM through the same PCI bus link as the cluster & OBDII port so not sure how (if) they were able to program it. If the scan tool does not receive data from an OBD II vehicle. Content on odyclub.com is generated by its users. Re: OBD port won't communicate W/Texas Inspection Station..N Fyi-talked with dealer and PCM has already been replaced. I cannot communicate with the OBD system. As touched upon in a previous post (Smog Check OBD Reference Update) certain 1999 and 2000 model year BMW vehicles with 2.5 liter and 2.8 liter displacement engines that are having trouble passing the smog inspection due to incomplete monitors may be subject to a voluntary emissions recall (00E-A01: Fault Access/O2 Readiness Codes). 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. Just what is up with Honda?? The dealership can communicate with the computer but everyone else I bring the car to can't get their scanning tools to communicate with the computer. ... lost here all. I have power to the port but don't know which wire is which so it may be the wiring for the port that is the problem. Since the mid-1990s vehicles have had a built-in troubleshooting system known as OBD. There is power at the OBD port....I get the appropriate indicator light on the interface when I … There is one wire that is called the "Communication line" that the connects the OBD connector to the Powertrain control module. First unit: CAS804 Auto Scanner Tool OBD 2 … The OBD2 port is usually in the same place as the Hum System. Also, is there a way to check the OBD port itself to make sure it is not just the wiring for the port. It looks like the cover is just a cover and not part of the PCM but I don't want to go ripping it apart without being sure. Diesel (compression ignition) vehicles were not required to support OBD until 2004. There is just no communication. no communication @ data port. Check for an open circuit. Start at the OBD port and remove one module at a time like you have started. They will be able to program it. Can anyone explain? I have an 07 Jeep Grand Cherokee with all the bells and whistles and it works, works on a 09 Chevy, and 09 Dodge pick up. Under the dashboard, right beneath the steering column. It has happened in the past, but with vag-com mechanic was able to reset codes and throttle would work fine. The first smog station tried twice and could not communicate with the vehicle. Next, you have to start measuring resistance on the OBD communication wires and find the breakdown. Do not connect to the body or chassis ground but to … The first smog station tried twice and could not communicate with the vehicle. See if you have power at the connector and then find a local shop with a Mastertech scantool that has a Honda card. So that needs to be checked. I noticed there is a 4-pin gray connector taped back behind the OBDII port and was wondering if something needed to be plugged into that as well to enable the reader to read the codes from the PCM. As it helps the network communicate with your car directly. JavaScript is disabled. Dealer says until ecu and cluster can communicate with each other car will not have spark and will refuse to run. I have tried 2 different scanners on my 2007 and trust me there are NO tricks. My 07's CEL has been coming on periodically for a couple years. Car will crank but have no spark. (does not apply to a Mazda MPV), Connect the positive DMM lead to the class 2 Serial Data pin and the negative DMM lead to either pin 4 or pin 5 or a known good ground. odyclub.com is not in any way affiliated with Honda Motor Company. 2007 Honda Civic Coupe won't crank. The OBD2 port should sits underneath the fusebox, the sides runs diagonally, and it has 16 pins. The second smog station (a test only station) ran the test 3 times and he told me, he has the lastest software update for this system. Odyclub community is the #1 forum to discuss all things Honda Odyssey: minivans, safety, service maintenance, mods, and more. The grey plug inside the fusebox is the CONSULT port, it is rectangular in shape, and has 14 pins. As touched upon in a previous post (Smog Check OBD Reference Update) certain 1999 and 2000 model year BMW vehicles with 2.5 liter and 2.8 liter displacement engines that are having trouble passing the smog inspection due to incomplete monitors may be subject to a voluntary emissions recall (00E-A01: Fault Access/O2 Readiness Codes). Usually the cigarette lighter fuse also powers the DLC (data link connector) with this fuse blown the scan tools can not communicate with the OBD2 system. Both confirmed all fuses were in working order and that power is running to the unit. Which DLC terminals are known as DLC bias terminals (or should it be DLC Bus terminals) Related. Pull up some wiring diagrams and pin assignments. Connector under the dash looks good...wires/pins not visually bad. Mind you, my instrument cluster and ecu connect on a bench. I still have no communication. Just what does CAN stand for??? CAS804 Auto Scanner Tool OBD 2 II Trouble Code Reader | eBay, OBD2 CANSCAN D900 Engine Code Reader Scanner Free P&P | eBay, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada, odyclub.com is an independent Honda enthusiast website owned and operated by VerticalScope Inc. GM cars produced in 2003-2006 use J1850-VPW interface or CAN. I am not sure how this forum works but I can't get my code reader to work on my 08 Odyssey either. The 199 fill ups on my 2009 Ridgeline with 20.6 MPG and over 60,000 miles driven- I just had 8 wonderful years in the Ridgeline but the Electronics are too many generations behind. 1st: neighborhood mechanic (who also has a Tacoma) said his scanner could not communicate with the computer. Also, is there a way to check the OBD port itself to make sure it is not just the wiring for the port. Scan Tool Will Not Communicate / Power Up Author Sparky Posted on August 14, 2011 Categories Communication Problems Tags A/C , Basic Test Methods , Cadillac , Chevrolet and GMC Trucks Although the vehicle I am working on is a 2005 Cadillac Escalade, this information is relevant to many OBD2 vehicles. The new cap fixed the problem until my wife closed the new cap on its rubber tether, causing a leak. So I made sure both units are compatible with CAN protocol. Ideas? Re: 06 OBD2 won't communicate has power to pin 16 Feb 01 2018, 11:18pm Yes I have power to pin 16 (the power to the scanner) I also have good grounds at pins 4 and 5. The OBD2 port should sits underneath the fusebox, the sides runs diagonally, and it has 16 pins. If the OBD2 is truly unreadable by any scanner then it is probably missing either power or ground to that port. All of my cigarette lighter ports have power as does the OBDII port. Took a while to find. Do not connect to the body or chassis ground but to the battery terminal directly. I finally took my truck to a couple of electricians to figure out what was up with my OBDII port. For some reason I have two OBDII units and neither one will communicate with my two Hondas: 2007 Odyssey, 2011 Accord I understand Honda uses OBDII with CAN protocol. How to determine exactly what's wrong with my alternator? 0. That was the issue with mine. Save my name, email, and website in this browser for the next time I comment. I even disconnected the battery for 15 minutes. I still think it is a fuse unless many other things are not working other than the OBD II connector. If there is a bad fuse, you will continue receiving the error when you link the obd2 to the computer. Is there any way to check for power at the OBD plug? If this wire is shorted or broken, the scanner will not be able to read the computer. 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. So that needs to be checked. For a better experience, please enable JavaScript in your browser before proceeding. OBD II..the scanner will not communicate when plugged in - Answered by a verified Ford Mechanic We use cookies to give you the best possible experience on our website. For some reason I have two OBDII units and neither one will communicate with my two Hondas: 2007 Odyssey, 2011 Accord. Your email address will not be published. Its the scanners. Check the fuse box (Power Panel), it might be the reason why PCM isn’t able to receive power as well as communicate. Test it with another car and see if it functions, if it doesn’t, then probably, the issue is not with the scan tool. With the ignition key ON and bus activity, the voltage should vary from 0 to 5V depending on the amount of bus activity! This will not effect the way the car runs at all because it is just for communication. I have power to the port but don't know which wire is which so it may be the wiring for the port that is the problem. If the OBD2 is truly unreadable by any scanner then it is probably missing either power or ground to that port. Each control module has a resistor that you should "see". Ecu is bypassed direct to OBD 2 port.