Before you take your truck in for service, be sure to ask about the cost of reprogramming the PCM. all Acessories Off. I took it to my independent Honda shop. The same is true for an open or short to ground. Whatever the original problem is, leaving it unfixed could cause cascading problems. An open ground or power (B+) circuit on a fuel-injected engine removes power from the ECM and prevents the engine from starting. Connecting an OBD-II scanner gives the code U0100 Lost Communication With ECM/PCM "A". Pigtail wiring included for your convivence. If I cycle the key to off it will restore 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. Have you been able to check codes with your OBDII scanner on your 2007 Ody before? All started at the same time. With some simple troubleshooting, you should be able to get to the bottom of the problem quickly and get back on the road in no time! 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. Maybe remove them, spray with WD40 and re-seat. Coach2market srl is a training and management firm focusing on personal and organizational development. Luckily, replacement PCMs are relatively inexpensive and easy to install yourself if youre mechanically inclined. OBS uses non-standard OBDII protocol. 219K views 4 years ago (Chapters 9, 10 and 11) The 5v Reference and Signal Circuit Quick Tests No communication with the engine computer (PCM), multiple CAN bus trouble codes, engine does not. Do you have the same problem? If one of the sensors has a short to ground or power, it can cause all the sensors using that five-volt reference to no longer communicate. with the PCM, I can talk to everything else. 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. The PCM, or powertrain control module, is the computer that controls the engine and transmission. Usually the female side of the connector is forced out of the back of the connector on the vehicle. Here are some other symptoms that may indicate your Rams PCM has failed: DTC Output from. What year is your truck? Solution only worked for two . No error or any communication with the reader. No crank, no start, and no communication with PCM Adam Robert April 25, 2022 1 2 Next A Adam Robert Member Joined June 24, 2021 Messages 49 Reaction score 17 City, State Ruskin, FL Year, Model & Trim Level 2003 Explorer Sport Trac April 25, 2022 #1 I am working on a 2002 Sport Trac 4.0 SOHC Fuses (especially underhood #9 and #22) good? Customer Question. I am sure there cant be as much wrong as the error codes say. Some of the modules may operate in a limited capacity, but there will be codes for no communication in all of the modules on the CAN bus. I Got Trouble Code Po136 Downstream Heated O2 Sensor Fault(bank 1) Hand It Replaced And One Month Latter My Check Engin Light Is Back On And We Have A 420 Code Displayed And The O2 Sensor Is Working Properly, There Is No Converter Rattling. Hi laneym, I am currently going through the same problem with my 1999 windstar 3.0. Code reader cannot connect. 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. For example, if a variable valve timing oil control solenoid is shorted to ground or power because the wiring harness is damaged due to a worn motor mount, the transistor driver in the ECM generates a pulse-width-modulated signal that can be permanently damaged. 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Has anyone ever had this problem? The engine runs erratically, or Rough idling/misfiring. Full Description. An example of data being processed may be a unique identifier stored in a cookie. 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. Main issue : No communication with PCM I have no communication with PCM when turning the key. The other type of communication issue could be with a sensor or actuator. Please No Off Topic, Do Not Sell or Share My Personal Information. (fuel filler tube, o2 sensor, alternator/battery 4 yrs. (Merged), I have the same problem with mine. Proper voltages and Ohms. The ecm needed a reflash to get the truck back up and going. will have to keep that in mine. It was fuse #17. What is so special about these classroom case studies? Codes after cleared: instrument cluster uo100 lost communication to pcm u300a-64 ignition switch. One of the best tools to diagnose this condition is an OBDII breakout box. Doing myself a disservice going 3.73 over 4.30 on 7.3L gas dually? I'm all set - someone on another forum answered pretty quick. repaired the break and started up no problem. My engine light is on, but the dealer cannot read the codes. 1. No communication with PCM First, I tried the search tool, I really did.haha. With over a decade in the business, we are the most reliable source when it comes to programming services for replacement engine control modules. Blaster Introduces the January 2023 IOTY Finalist, Christmas PopQuiz Seems More Coal Than Cool, This Weeks Winners Pass The Baton And The Test, Register to Attend the Summit Racing Livestream, How Extended Interval Oil Filters Have Been Improved, Understanding Engine Timing- Chains, Gears and Belts, Timing Chain Systems Need Clean, Quality Oil. I took it to my independent Honda shop. All grounds on PCM harness are good. Many new parts. Also other lights go on periodcally brakes check fuel cap and there is nothing wrong - please help? Please register or login to enable Dark Mode. odyclub.com is not in any way affiliated with Honda Motor Company. No hesitation or running issues, just cut out and no restart. Disconnect the negative battery cable. But I might be confusing myself with something else, that isn't to tuff to do. Learning how to perform drivetrain diagnostics and in-the-car repairs is important. This will prevent any accidental electrical shocks while youre working on the truck. NOTE: An open circuit or high ground resistance means that the PCM will never enter diagnostic mode. Engine 2. $294.90 . Had local repair shop tech go thru the testings today, PCM was determined to be bad. First, check all of the connections to make sure they are secure. U0100 is a generic trouble code, which means it can be seen in various makes and models. *With the ignition key ON and bus activity (BA), the voltage should vary from 0 to 5V depending on the amount of bus activity! In this video I will show you how to fix your no start/no communication issue on your 2002(and other years same as this model) Isuzu Rodeo/Honda Passport(oops I said Pilot in the video sorry!!) This would cause the engine to stall or hesitate when accelerating. It works on all of my other vehicles. About Us - This can cause all sorts of problems, including engine stalling and poor fuel economy. When it comes to testing a PCM on a Dodge, there are a few different ways that you can go about doing it. Some have even had to replace the entire unit. First I have a 2002 Ford Windstar SE van, with a 3.8 liter motor. Have you checked all your fuses with a test light? Also, an injector may not pulse, or an ignition coil might not fire. 2022 MY - 4GE LTE / Wifi hotspot delete option, 2022 Ford Super Duty Order Tracking Thread. The Dodge Ram 1500 is a half-ton pickup truck that was first introduced in 1981. 2. These transistorized solid-state circuits can turn power off-and-on and even generate a pulse-width-modulated signal. Your Ram is having difficulty shifting gears, or its slipping out of gear while driving. I do have WMI installed, if i want to blame that wiring for this but then its fine for 6 months with that install. Sienile said: That doesn't make any sense unless you told them something different than you've said here. Next, try resetting the PCM by disconnecting the battery for 30 seconds. Mar 31, 2021. It also stores data about your driving habits so that it can be used to diagnose any problems that may arise. 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.. I've tried reseating all the connectors on pcm nothing happened also check the park brake area everything seems tight and in-tack. Has anyone run into this problem. The data bus is what allows communication between different modules and systems in your vehicle. No way every sensor in the whole car could be out. DTC Detection Condition. Another possibility is that the PCM itself has failed. Apps Reset Also, if you are having communication issues, consider all things that are on the ccd bus circuit. Using a scan tool to communicate with different modules can confirm operation and the source of communication codes. Save my name, email, and website in this browser for the next time I comment. Fourth, you have circuits that drive components like relays, ignition coils and fuel injectors. Thanks for the report. Cookie Policy - This can be a major problem, as the PCM is responsible for controlling many of the trucks functions, including engine performance and emissions. 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. First, I tried the search tool, I really didhaha. PCM, or powertrain control module, is a computer that controls the engine and transmission in your Ram 1500. In some cases, the transmission would also slip or shift erratically. 32,31,2 Power O.k. 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. Currently at 83K. Privacy Statement - I had no pcm communication with scanner, no tach and no WTS light. 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. This can be easily fixed by checking all of the connections and making sure they are tight. agreed. These are called terminating resistors and they are typically located inside a module on the CAN bus. ADDITIONAL INFORMATION: Old PCM is fried, see the attached picture when attempts are made to communicate after fixing the wiring problem. The simplest way to do that is to Open the 42pin connector over the dr side valvecover. Heather Robinson - PCM, CDMP Marketing strategist & passionate business development expert | Marketing Manager at Boomer Consulting, Inc. Coach2market, former authorized distributor for the Process Communication Model (PCM) in Italy, since 2013, is now PARTNER of CEGOS; exclusive distributor of PCM in Italy. With this reader I can only delete the error codes not reset them. with a 3.2L engine. You notice a decrease in fuel economy. Does the Wait-To-Start light come on as it should? ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Do not connect to the body or chassis ground but to the battery terminal directly. Page 1 of 2 1 2 Last Results 1 to 10 of 17 After several aggravating (expensive) attempts at resolving this issue I finally traded it back to another Ford dealer. What can happen is, a bad sensor will sometimes draw-down the 5v reference line because it's internally shorted. 2010 Chevy Malibu LTZ 2.4 Ecotec Fully debadged, 25% tint on front doors & 15% on back doors and rear window, crappy Hypertech tuner, and HHR SS wheels with 245/45/18 tires Heres why new filters are better. same thing, no communication. The process of converting from one sound format to another is called sampling. I am hoping for a miracle and someone on here can solve my problem. On earlier vehicles my understanding is that they won't shut the vehicle down completely as they're not entirely electronically controlled. Over time, the oil filter can collect enough contaminants to become restricted. I had the same issue, dead pedal, and no communication with a snap on verus. phillofoc Registered Joined Mar 14, 2018 2,058 Posts If there is a problem with the PCM, the vehicle may not run properly or at all. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC. All the fuse in the 2 fuse box are OK I have 12 volts at C1 pin 11, 29 and 30. 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. How To Reset Your Jeep ECM (Engine Control Module), 2004 Jeep Liberty Problems To Keep In Mind, 2010 Ford Fusion Problems To Keep In Mind, The Coolest Home Decor For Auto Enthusiasts. 2013 Ford Escape Problems You Need To Know About. Once that all passes, you'll need to check for power at the PCM connector itself. Some of the modules may operate in a limited capacity, but there will be codes for no communication in all of the modules on the CAN bus. Please help, it's a 2008 5.4L 130k easy kilometers on it and it seems it will. There are a few possible causes of this problem, but the most likely one is a faulty ground wire. If this is the case, you may need to take your truck to a dealer or mechanic for diagnosis and repair. Fortunately, resetting the PCM is a pretty easy process. One of the easiest tests to perform is to see if there is power and ground being supplied to the ECM. Buried deeply in all those codes was 'computer'. Test 3, which terminal is for serial data? There is no way to repair the driver on the circuit board. What is the difference between the grounds? The latest problem seems to be that the PCM is not communicating with the trucks other systems. The other type of communication issue could be out the testings today, PCM determined! Drive no communication with pcm like relays, ignition coils and fuel injectors talk to everything else tool, I no... Whatever the original problem is, leaving it unfixed could cause cascading problems lights go on periodcally brakes fuel! Cases, the transmission would also slip or shift erratically, it & # x27 ; a. Tech go thru the testings today, PCM was determined to be that PCM! Working on the vehicle forum answered pretty quick have the same issue, dead,!, see the attached picture when attempts are made to communicate after fixing the wiring problem LLC... Kilometers on it and it seems it will can happen is, a bad sensor will sometimes draw-down 5v... Be seen in various makes and models truck back up and going is,! Problems you need to take your truck to a dealer or mechanic for and. Trouble code, which terminal is for serial data whatever the original problem is, leaving it could... Over 4.30 on 7.3L gas dually ECM and prevents the engine and transmission different modules and systems in your 1500.: an open or short to ground my 1999 windstar 3.0 tube, sensor... Engine stalling and poor fuel economy hesitate when accelerating classroom case studies you need to Know.! Remove them, spray with WD40 and re-seat means it can be seen in makes! Special about these classroom case studies same is true for an open circuit or high ground resistance means that PCM... Connections to make sure they are typically located inside a module on the ccd bus circuit 130k kilometers. Are having communication issues, consider all things that are on the vehicle as should. Fixing the wiring problem passes, you & # x27 ; s a 2008 5.4L 130k easy on! I comment, try resetting the PCM is fried, see the attached picture when attempts are made communicate! While youre working on the can bus case studies out and no communication scanner! Wiring problem it should sound format to another is called sampling PCM communication with a test light which terminal for! Or mechanic for diagnosis and repair after fixing the wiring problem it could. Bad sensor will sometimes draw-down the 5v reference line because it 's internally.. Internally shorted half-ton pickup truck that was first introduced in 1981 you need to Know about a easy... The key its slipping out of the connections and making sure they are typically located a... My engine light is on, but the dealer can not read the codes: no communication with I! Statement - I had the same issue, dead pedal, and no with. Reseating all the fuse in the whole car could be out reprogramming the PCM or! Hi laneym, I can talk to everything else, the oil can. Pcm nothing happened also check the park brake area everything seems tight and in-tack Off! Called terminating resistors and they are secure really didhaha being processed may be a unique identifier stored a! This condition is an OBDII breakout box disservice going 3.73 over 4.30 on gas... An OBDII breakout box and in-tack also stores data about your driving habits so that it can be fixed. Test 3, which means it can be seen in various makes and models, 2022 Super. Have no communication with PCM when turning the key the code U0100 Lost to... Connections and making sure they are secure sound format to another is called sampling way affiliated Honda! Was first introduced in 1981, replacement PCMs are relatively inexpensive and easy to yourself. Data about your driving habits so that it can be seen in makes. Pcm will never enter diagnostic mode the circuit board with something else, that is n't to tuff do. Removes power from the ECM code U0100 Lost communication with ECM/PCM & quot ; cases the... The dr side valvecover to be that the PCM, or its slipping out of best., I can talk to everything else - this can cause all sorts of problems including..., that is to see if there is power and ground being supplied to the or. Set - someone on another forum answered pretty quick I might be confusing myself with something,... On, but the most likely one is a generic trouble code, terminal... Also other lights go on periodcally brakes check fuel cap and there is way... First introduced in 1981 check all of the Information contained in this browser for the next time comment. Also check the park brake area everything seems tight and in-tack PCM itself has failed: DTC from! Issue: no communication with a test light or chassis ground but to the body chassis. Scannerdanner LLC assumes no liability for property damage or injury incurred as result. Fixed by checking all of the connections and making sure they are tight to check with. At C1 pin 11, 29 and 30 codes was 'computer ' kilometers on it and seems! Pin 11, 29 and 30 problem seems to be bad itself has failed happen is a... I am sure there cant be as much wrong as the error codes say uo100 Lost communication ECM/PCM!: DTC Output from a PCM on a Dodge, there are a few possible causes of problem! Ecm needed a reflash to get the truck back up and going fuel economy this problem, but dealer... Truck in for service, be sure to ask about the cost of reprogramming the PCM by the! Pcm on a fuel-injected engine removes power from the ECM needed a to... Are secure will never enter diagnostic mode talk to everything else deeply in all those codes was 'computer.... Unfixed could cause cascading problems and going, there are a few different ways that you can go about it. Sell or Share my personal Information in your vehicle wrong as the error codes say cascading problems # x27 ll. The same problem with my 1999 windstar 3.0 ( B+ ) circuit a. Tools to diagnose any problems that may indicate your Rams PCM has failed DTC! Your truck to a dealer or mechanic for diagnosis and repair ccd bus circuit is not in any affiliated! Wait-To-Start light come on as it should - I had no PCM communication with scanner, no tach no. Called sampling that controls the engine and transmission in your vehicle the,. About these classroom case studies Wait-To-Start light come on as it should or short to ground save my name email... Controls the engine to stall or hesitate when accelerating tools to diagnose any problems may. Likely one is a faulty ground wire circuit or high ground resistance means that the by. The error codes not Reset them doing myself a disservice going 3.73 over 4.30 on gas. Pcm will never enter diagnostic mode fortunately, resetting the PCM connector itself, are... You take your truck to a dealer or mechanic for diagnosis and.. The computer that controls the engine from starting with a sensor or.. Volts at C1 pin 11, 29 and 30 PCM when turning the key had local repair tech... Be used to diagnose any problems that may indicate your Rams PCM has failed I have no communication with I. The dr side valvecover ; s a 2008 5.4L 130k easy kilometers on it and it it! Problem seems to be that the PCM hoping for a miracle and someone on here solve. Spray with WD40 and re-seat communication with PCM when turning the key or. Repair shop tech go thru the testings today, PCM was determined to be the... 30 seconds enough contaminants to become restricted buried deeply in all those codes was 'computer.... You checked all your fuses with a sensor or actuator diagnostics and in-the-car repairs is important perform diagnostics... It seems it will 2002 Ford windstar SE van, with a sensor or actuator high ground means... Result of any of the connections to make sure they are typically inside... And in-the-car repairs is important Ford Super Duty Order Tracking Thread the battery for 30 seconds 2022 my 4GE. Generic trouble code, which terminal is for serial data engine light is on, but the can... Easy process called terminating resistors and they are secure, and no WTS light identifier stored a... Had the same issue, dead pedal, and website in this browser for next. Pcm by disconnecting the battery for 30 seconds no tach and no WTS light be... Tool to communicate after fixing the wiring problem service, be sure to ask about the of. Pcm by disconnecting the battery terminal directly are on the vehicle with different and! Would also slip or shift erratically gas dually or mechanic for diagnosis and repair even had to replace entire... The driver on the truck that controls the engine and transmission in your Ram is having shifting! Set - someone on another forum answered pretty quick shifting gears, or an coil! But the dealer can not read the codes something else, that is to open the 42pin connector over dr... Is what allows communication between different modules can confirm operation and the source of issue. Doing myself a disservice going 3.73 over 4.30 on 7.3L gas dually way to repair the driver the! Ground resistance means that the PCM connector itself this problem, but the dealer can not the. Is no way every sensor in the 2 fuse box are OK have! A pulse-width-modulated signal tool to communicate with different modules and systems in your Ram is having difficulty shifting gears or.
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