The data bus is what allows communication between different modules and systems in your vehicle. 1997 F250 SC 4x4, E4OD, 4.10 LS, Basically Stock, Relocated Block Heater Plug, External Trans Filter, Tru-Cool Max, I/C Mounted but not Plumbed. Checked fuses, swapped IPDMs with another car. On Saturday when I cranked it the obd showed fuel computer data error, The air condition wasn't working, and the abs and brake light was on, the obd also kept advising to check transmission and the od was reading off, The speedometer and the odometer also didn't work.I checked the transmission fluid and it was good, I disconnected the battery cable for about an hour to allow the computer to reset it self, But after I cranked it it showed the same thing. [/cmsmasters_text][/cmsmasters_column][/cmsmasters_row], TFor 2008 FX35 Infinit 3,5L In some cases, the transmission would also slip or shift erratically. Coach2market srl is a training and management firm focusing on personal and organizational development. I'd check connections. Installed in 2022. Monitors are ready. Please No Off Topic, Do Not Sell or Share My Personal Information. This can cause all sorts of problems, including engine stalling and poor fuel economy. Sent from my Rock using a Chisel Disconnect the negative battery cable. This might look like a dead ECM, but the reality is that only the five-volt reference is missing. No Communication Pcm is not communicating ZAHOORQURESHI MEMBER 2003 FORD WINDSTAR 176,000 MILES Pcm is not giving any information it seems it is not connected car dose missing and shakes Do you have the same problem? I had that problem with another ford, but similar pcm. This should fit all Saab 9-3 from 2003-2007 and may fit up to 2011. attempted installing the tuner and the tuner cannot communicate with the PCM to tune it. Connecting an OBD-II scanner gives the code U0100 Lost Communication With ECM/PCM "A". Pin 16 is the positive voltage side being supplied to the ECM. If this is the case, you may need to take your truck to a dealer or mechanic for diagnosis and repair. Test 3, which terminal is for serial data? Recently the CEL came on. Why The P0136 Trouble Code Matter and Should You Care? No Smokers. Thanks, Heather Robinson - PCM, CDMP Marketing strategist & passionate business development expert | Marketing Manager at Boomer Consulting, Inc. Do not connect to the body or chassis ground but to the battery terminal directly. cond. Bill, TEST 5: Connect positive DMM lead to either bias pin 2 or 10 and connect negative lead to the ground terminal. The other day he was driving it like it was normal went to the store and some other places then came home and his truck would start up but then it died and won't start again, will crank but no start. In some ECUs, the crankshaft position, camshaft position and maybe the MAP sensor will use the same five-volt source. We and our partners use cookies to Store and/or access information on a device. Certain engine control computer upgrades, for example, include upgraded components installed in critical circuits, installation of heavier injector transistors, circuit protected quad drivers, reflow of solder joints, and an upgraded power supply diode for the ignition circuit to improve durability. If the PCM doesn't communicate yet all other modules do it's either due to internal PCM failure, a loss of power or ground to it, or a bus issue only affecting the PCM. They just didn't know what they were doing. Continue with Recommended Cookies. Customer Question. Another possibility is that the PCM itself has failed. 2015 Challenger HellCat Redline Red 8sp 1997 F350 4X4 CCLB PSD 2004 Jetta TDI 1999.5 Jetta TDI 11mm pump S7 PP764's 3bar MAP 1986 F350 CC Dually 6.9 ATS turbo lowered What is so special about these classroom case studies? I took it to my independent Honda shop. It loses comm. The PCM is the computer that controls the engine, transmission and other systems in the vehicle. Second, communication circuits allow the module to communicate on the networks of the vehicle with other modules. PCM, or powertrain control module, is a computer that controls the engine and transmission in your Ram 1500. Has anyone run into this problem. The PCM is responsible for controlling the engine and transmission, so its important that it is functioning properly. **No Bus Activity! I get a code U0140 LOST COMMUNICATION WITH BODY. The stock gauges quit working, check gauges, my cts2 lost communications with the truck, all wiring appeared fine. To start viewing messages, select the forum that you want to visit from the selection below. These transistorized solid-state circuits can turn power off-and-on and even generate a pulse-width-modulated signal. odyclub.com is not in any way affiliated with Honda Motor Company. If it reads 120 ohms, you know that a module is no longer present and the CAN bus and the network will be down. Currently at 83K. Fortunately, resetting the PCM is a pretty easy process. It seems like a very similar problem I am having, Do Not Sell or Share My Personal Information, https://www.ford-trucks.com/forums/1ont-start.html. The ecm needed a reflash to get the truck back up and going. So my 6.7 left me hanging the other day, went to start nothing. Your Samsung TV is able to play PCM files. Very small breaks like that can be hard to see, esp. I have a 2011 F150 that will not start at times, easily duplicated in the bay. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. 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. OBS uses non-standard OBDII protocol. Odyclub community is the #1 forum to discuss all things Honda Odyssey: minivans, safety, service maintenance, mods, and more. Took all 3 connectors at pcm out and blowed air through and sprayed W.D nothing. Detection Item. Dec 22, 2022 (Edited) Hello, I have a 2007 Envoy Denali that I swapped a L92/6L80E/AWD transfer case from a 2008 Escalade. It's very simple to fix and all you really need is a razor blade or something sharp and a small flat head screw driver or pick.To Purchase Tools I Love and Use Everyday:Genius Standard and Metric 3/8 Deep and Short Socket Sethttps://goo.gl/amuNW8Bostitch 1/4\" impact driverhttps://goo.gl/32VGmBImpact Driver Socket Adaptor Sethttps://goo.gl/ebcTo34 PC PICK AND HOOK SEThttps://goo.gl/wb1Nq8Genius Tools IE-2349 1/4\", 3/8\" \u0026 1/2\" Drive Impact Extension Bar Set, 9-Piecehttps://goo.gl/EQqKGnI hope you enjoyed this video. Often, the connector can be damaged if the scan tool or code reader has been pushed in and out frequently. Full Description. Sometimes, there will be a DTC for the circuit; sometimes there wont be a code. If this is the case, you will need to replace it with a new one. Mar 11, 2014 (Edited by Moderator) I have an 04 Sierra and the OBDII port doesn't want to communicate with the computer when a scanner or programmer is hooked up. Cloudflare Ray ID: 78ba41583b281bd6 I notice it because last year I had the same problem with my 2014 6.7. Using the wrong oil is a common problem that causes a vehicles timing chain to wear even quicker. With any communication network, the resistance in the circuit, resulting voltage and circuit condition can determine if information is being communicated with other modules. I am thinking to check the fuses. Also when driving the van the overdrive is still working, Thursday, June 11th, 2020 AT 1:44 PM And I would get a second opinion first. Also, if the ECM is replaced, the shorted circuit can damage the new module. (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. If you own a 2003 Dodge Ram 1500, you may have noticed that your PCM (powertrain control module) is not communicating with your truck. You can just see the break in the fuse, just off the left leg. This website is using a security service to protect itself from online attacks. On some vehicles, the wires for pins 4 and 5 attach at the same point of the body. Cheers! 32,31,2 Power O.k. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. I seem to recall the diagnostic port being on the same fuse as the extra power point in the cab. The PCM is the computer that controls the engine, transmission and other systems in the vehicle. Fuses #9 and #22 are good No chips or modes I did a 'pin out' on the PCM: With ignition off pin 55 has 12v Rear power hatch not working. 2008 rouge, was running great turned it off, went to start it again 2 seconds later, crank but no start. Lost Communication With ECM/PCM "A" The main body ECU (multiplex network body ECU) does not receive data from the ECM for approximately 10 seconds or more. $294.90 . With the ignition on, the voltage drop across the ground terminal should be 0.1 Volts or less TEST 2: Repeat for DLC pin 5 In some cases, the PCM may need to be replaced. TEST 3: Voltage check on DLC pin 2. battery is new. With these types of errors, you can communicate with a module, but the information from a sensor is missing or implausible. i tried hooking up our genesis scanner to see if it would communicate. The same is true for an open or short to ground. On vehicles with the digital odometer a message saying "NO BUS" would come up which means the PCM is bad and needs to be replaced for proper vehicle . Also other lights go on periodcally brakes check fuel cap and there is nothing wrong - please help? With the ignition key ON and bus activity, the voltage should vary from 0 to 5V depending on the amount of bus activity! Each time, I recieved a "Link Error" message. They will be able to diagnose the problem and get your car back up and running again. Mar 28, 2009. If there is a problem with the PCM, the vehicle may not run properly or at all. No crank no start. Using a scan tool to communicate with different modules can confirm operation and the source of communication codes. 2003 . Apr 13, 2011 HELP Jeep is acting out. It works on all of my other vehicles. Radio - Aftermarket 3. Engine 2. No dvd player. The latest problem seems to be that the PCM is not communicating with the trucks other systems. The solder that connects the components to the circuit board can also fail. Pin 2 is the AUX POWER TRAIN controller which I'm guessing you don't have. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. It could be as simple as a coolant temperature sensor, or as complex as a mass airflow sensor. All of the scan tools power up as if the port is working but can't connect. U0100 is a generic trouble code, which means it can be seen in various makes and models. No communication from PCM. Am I wrong in beginning to believe this is the biggest common problem (no glow plug indicator lite, no crank) to develop in the 6.7? Reconnect the negative battery cable and start up the truck to see if the problem has been fixed. Now I am going through a check engine light on with vibrations and my diagnostic port does not work (AutoZone says I have a short or something somewhere in my dash). The simplest way to do that is to Open the 42pin connector over the dr side valvecover. Tested ignition switch good. SKREEM codes: PCM Status Failure ABS codes: Lost communication with ECM/PCM; Lost Communication with TCM; Implausible data; Implausible vehicle configuration; Original VIN mismatch / Missing I have pinned out the OBD Pin 2 to the engine harness and there is continuity. No hesitation or running issues, just cut out and no restart. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. *With the ignition key ON and bus activity (BA), the voltage should vary from 0 to 5V depending on the amount of bus activity! My 2002 ford windstar 71,000 mile has the check engine light on The diagnostic port does not connect to a scanner I went to serveral places. Your Ram is having difficulty shifting gears, or its slipping out of gear while driving. Pin 4 is chassis ground and is a ground taken from the body of the vehicle. I tried to check it with my OBDII Scanner. Third, you have circuits that receive information from sensors and generate reference voltages. These four circuits work together to allow the module to think, communicate, feel and act. How to Reset the Engine Control Module With No Hassle. Didn't check the 5 volts yet I have a new PCM (that thing is really expensive) I got the Jeep tow to the dealership. Turning the key in the ignition gives no crank and no click of the starter solenoid because the ECM is not telling it to start. No communication with the PCM usually = the PCM has no power. Save my name, email, and website in this browser for the next time I comment. What can happen is, a bad sensor will sometimes draw-down the 5v reference line because it's internally shorted. Just because its red doesnt mean its all the same. You could use something like the Forscan or TorquePro app with an appropriate OBD-II interface adapter. If neither of these work, you may need to replace the PCM itself. Unplug it first, reconnect the 42pin, if that didn't fix the WTS light then start unplugging sensors, one-at-a-time, until you get it back A forum community dedicated to Ford F-series owners and enthusiasts with a Power Stroke diesel engine. Have you checked all your fuses with a test light? Engine light blinking. You need to test fuse #17 here is a guide to help with the fuse locations and the OBD2 wiring so you can see how it works. Heres why new filters are better. At this point I'm lost and need your help. Since most networks on the vehicle can be accessed through the OBDII connector, this tool helps you observe if the network is active, open or shorted. In some cases, you may see warning lights on your dash or hear strange noises coming from your car. Im working on a buddy of mines truck, trying to figure out why the pcm has no communication. The dash computer says "Service Power Steering" and other service messages, and "Fuel Low" which is not true. Thank you for your time! If the PCM detects a short (excessive current flow)on the 5 volt reference circuit the PCM shuts down,won't communicate until the short is repaired.Many components use reference voltage from the PCM.Here's a quick way to see if that might be your problem.Turn the ignition "On" and backprobe the EBP sensor or peel . Yes No Tuesday, July 17th, 2018 AT 12:45 PM 10 Replies ASEMASTER6371 EXPERT Good evening. ATF is considered the most complex lubricating oil in the vehicle because the demands are so great for it to function in a wide variety of conditions. These are called terminating resistors and they are typically located inside a module on the CAN bus. PCM has high noise immunity because the information is transmitted in the coded form (digital form) rather than varying the width or position of the pulse, which is less affected by the noise. Some have even had to replace the entire unit. Doing myself a disservice going 3.73 over 4.30 on 7.3L gas dually? This is because the software that is unique to the vehicle is not programmed or flashed into the modules memory when it comes from your parts supplier. Leather interior/ front heated, no rips/tears. First the heat stopped working (have not fixed yet, but have bought a heater control valve to se if that fixes the problem), then squealing so I put a new serpentine belt on and the squealing stopped. So, again, the communication issue could be with the sensor or actuator, or the problem could be on the modules circuit board.