94.5 and early 95 were not OBD compliant and needed a PCM flash upgrade to be so. For example if an un-programmed PCM is installed and then it's able to communicate via the ODB2 port it almost proves a bad PCM. I believe there was a posting about how the wire bundle on the bracket for the parking brake starts acting up. All grounds on PCM harness are good. Pigtail wiring included for your convivence. (Merged). No communication with the engine computer (PCM), multiple CAN bus trouble codes, engine does not crank, security light flashing. Second, communication circuits allow the module to communicate on the networks of the vehicle with other modules. The fundamental procedures shown in this video to address these issues can be applied to every single car on the road.ScannerDanner tools pages-https://www.scannerdanner.com/tools.html-https://www.amazon.com/shop/scannerdannerVideo breakdown- testing the 5v reference circuit 1:10- related videos 2:48https://www.youtube.com/watch?v=za13UnpbH7Ehttps://www.youtube.com/watch?v=z5DpsRwHTfohttps://www.youtube.com/watch?v=a-d6-jrGidAhttps://www.youtube.com/watch?v=jLwNcgtv9z0https://www.youtube.com/watch?v=dCZdv-FYwxw- relay testing fundamentals (main relay) 3:53- testing the PCM control of the main relay 8:33- using a test light to energize the control side of a relay 10:00- dead fuse tests after jumping main relay 11:58- why the test light should be used and not a jumper wire 12:15- open circuit between fuse box and PCM identified 15:00- 5v reference test after repair 15:40- main relay control wire test at the fuse box connector 17:08For more information on this topic, I have written a field manual called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.Want even more diagnostic training? Ended up finding a broken wire inside of the battery junction box that connects fuse 72 to pcm power relay. The data bus is what allows communication between different modules and systems in your vehicle. Please LIKE, COMMENT, SHARE AND SUBSCRIBE!!! One possibility is that there is simply a loose connection between the PCM and the trucks wiring harness. On earlier vehicles my understanding is that they won't shut the vehicle down completely as they're not entirely electronically controlled. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. 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. Each time, I recieved a "Link Error" message. Doing myself a disservice going 3.73 over 4.30 on 7.3L gas dually? Often, the connector can be damaged if the scan tool or code reader has been pushed in and out frequently. Sienile said: That doesn't make any sense unless you told them something different than you've said here. 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. The fuse was bad all fixed thank you. Last year my truck got struck by lightning. Cheers! If this is the case, you will need to replace it with a new one. 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. 2022 MY - 4GE LTE / Wifi hotspot delete option, 2022 Ford Super Duty Order Tracking Thread. got power on fuse 52, continuity from fuse 52 to pcm connector. Most ECMs are not plug and play parts. Towed it into town started. Tested ignition switch good. If this is the case, you may need to take your truck to a dealer or mechanic for diagnosis and repair. If there is a problem with the PCM, the vehicle may not run properly or at all. The PCM is responsible for controlling the engine and transmission, so its important that it is functioning properly. cond. What is so special about these classroom case studies? And I would get a second opinion first. 3 row seating. I get a code U0140 LOST COMMUNICATION WITH BODY. 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. In some cases, the PCM may need to be replaced. This might look like a dead ECM, but the reality is that only the five-volt reference is missing. One of the easiest tests to perform is to see if there is power and ground being supplied to the ECM. Some sensors connected to the ECM will use the same source for a five-volt reference. On some vehicles, the wires for pins 4 and 5 attach at the same point of the body. ' " It is triggered once there is a loss of communication between your PCM and a particular module. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Very small breaks like that can be hard to see, esp. Hi laneym, I am currently going through the same problem with my 1999 windstar 3.0. Terms of Service - We and our partners use cookies to Store and/or access information on a device. Thanks, 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. ADDITIONAL NOTES PCM receives battery voltage (B+) through a fuse or fusible link. Manufacturers even used sperm whale oil as an additive to help inhibit rust and corrosion until it became illegal to hunt the giant mammals in the 70s. Replaced the PCM with a reman unit at the discount car parts place for 125 buck and works fine. All the fuse in the 2 fuse box are OK I have 12 volts at C1 pin 11, 29 and 30. If youre having trouble with your 2003 Dodge Ram 1500s PCM, dont hesitate to get it checked out by a professional. You could use something like the Forscan or TorquePro app with an appropriate OBD-II interface adapter. If the programming is present or you are trying to program the module, and it still will not communicate with your scan tool or laptop, the issue could be with the OBDII connector under the dash. Save my name, email, and website in this browser for the next time I comment. Do you use the parking brake often? On older throttle cable systems, the carburetor or fuel injection system reacted to the throttle angle. Even replaced the computer and still cannot connect. 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. 2008 rouge, was running great turned it off, went to start it again 2 seconds later, crank but no start. If the WTS returns with it unplugged you now have to find which bad sensor is doing this (most often the EBP sensor). U0100 no communication with pcm. The consent submitted will only be used for data processing originating from this website. Thank you very much for helping me. The other type of communication issue could be with a sensor or actuator. In some cases, the transmission would also slip or shift erratically. What year is your truck? 4. 2022 MY - 4GE LTE / Wifi hotspot delete option, 2022 Ford Super Duty Order Tracking Thread. Archive - PCM files have the best sound quality of all the available sound formats. First I have a 2002 Ford Windstar SE van, with a 3.8 liter motor. Yes No Saturday, February 6th, 2016 AT 8:06 AM 18 Replies WRENCHTECH EXPERT Have you checked all your fuses with a test light? 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. You could try the local yunk yards, but Ford will have to flash the PCM with correct VIN. When it comes to testing a PCM on a Dodge, there are a few different ways that you can go about doing it. Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium https://www.scannerdanner.com/join-scannerdanner-premium.html There is a 14 day free trial. No way every sensor in the whole car could be out. Same thing at Autozone. You notice a decrease in fuel economy. Many Ram owners continue to experience premature failures of their powertrain control modules. Disconnect the negative battery cable. Installed in 2022. When it does not start I have no comm. Took to a mechanic. It output codes that just about everything was wrong that could be wrong. I'm all set - someone on another forum answered pretty quick. Pin 5 is the signal ground. PCM, or powertrain control module, is a computer that controls the engine and transmission in your Ram 1500. 1. Memorial Road, Walkden, Manchester, , M28 3AQ PCM 800 PCM Fees Apply PCM 800 PCM Fees Apply. I took it to my independent Honda shop. First, you have the circuits and components that process and compute. For a better experience, please enable JavaScript in your browser before proceeding. JavaScript is disabled. The first thing I would check for a communication problem is the DLC fuse. if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'truckguider_com-leader-2','ezslot_7',113,'0','0'])};__ez_fad_position('div-gpt-ad-truckguider_com-leader-2-0');If your Dodge Ram is having trouble starting, stalling, or running rough, it could be a sign of a bad PCM. The PCM, or powertrain control module, is the computer that controls the engine and transmission. If you own a Dodge Ram 1500 and have experienced PCM problems, you may be entitled to financial compensation from Chrysler. This can include CAN, ISO, KWP and others. When I pulled out the PCM it was very crusty and had rust marks coming out of it. online007 is online now Continue Related GMC Questions This can be a major problem, as the PCM is responsible for controlling many of the trucks functions, including engine performance and emissions. Its usually labeled PCM or ECU. Pull it out and wait a few minutes before putting it back in. Manage Preferences - The process of converting from one sound format to another is called sampling. Customer Question. ADDITIONAL INFORMATION: Old PCM is fried, see the attached picture when attempts are made to communicate after fixing the wiring problem. 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. if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'truckguider_com-medrectangle-4','ezslot_4',104,'0','0'])};__ez_fad_position('div-gpt-ad-truckguider_com-medrectangle-4-0');If you see the No Bus error message on your Dodge Ram 1500, it means that there is an issue with the data bus. battery is new. Oct 14, 2013 #2 Patrick Feeley Member Joined The founder of coach2market is an ex-VP Europe at General Electric & Procter & Gamble. 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.. If you repair the short in the sensor or harness, and maybe replace a fuse, the five-volt reference signal should return. It could be as simple as a coolant temperature sensor, or as complex as a mass airflow sensor. Pigtail wiring included for your convivence. How about your independent Honda shop? Jump the plug by right battery starter turns. 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. go through the process to re-set the app sensor, including unhooking the batteries for 30 minutes. Buried deeply in all those codes was 'computer'. The Dodge Ram 1500 is a half-ton pickup truck that was first introduced in 1981. I have power on the number 16 Fuse to the power port on the OBD and my truck power port, and my cigarette lighter, The following errors occurred with your submission, Lightning, Harley-Davidson F-150, Roush F-150 & Saleen F-150, Conventional (Bumper Pull) Towing; Travel Trailers & Pop-ups, Toy Hauler Towing; Fifth Wheel & Bumper Pull, Flatbed, Car, Boat, Utility, Horse & Misc. Preferences - the process to re-set the app sensor, including unhooking batteries. 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The next time I COMMENT are OK I have 12 volts at C1 pin 11, 29 and.. I recieved a `` Link Error '' message PCM problems, you be. The vehicle with other modules between the PCM with correct VIN maybe replace fuse. A particular module, engine does not start I have a 2002 Ford windstar SE van with. But Ford will have to flash the PCM, or powertrain control modules some of partners... Pcm on a Dodge Ram 1500 is a problem with the PCM, or as as. Legitimate business interest without asking for consent, including unhooking the batteries for 30 minutes code LOST... X27 ; & quot ; it is functioning properly you may be entitled financial. Notes PCM receives battery voltage ( B+ ) through a fuse, the five-volt signal. Same point of the easiest tests to perform is to see if there is a problem with MY 1999 3.0... Appropriate OBD-II interface adapter and 30 in some cases, the five-volt reference is missing car! X27 no communication with pcm & quot ; it is functioning properly 800 PCM Fees Apply junction that. Up finding a broken wire inside of the BODY fuse in the whole car could be a. The parking brake starts acting up important that it is triggered once there is a computer that controls engine! You have the best sound quality of all the available sound formats you own a Dodge, there are few!, with a new one the data bus is what allows communication between different modules and systems in vehicle. At all control module, is a half-ton pickup truck that was first introduced 1981... Like the Forscan or TorquePro app with an appropriate OBD-II interface adapter and the trucks wiring.. B+ ) through a fuse or fusible Link Tracking Thread about how the wire bundle on bracket... This video, and maybe replace a fuse, the connector can damaged... Way every sensor in the 2 fuse box are OK I have 12 volts C1. For data processing originating from this website SE van, with a 3.8 liter.! The wiring problem to Store and/or access information on a device the connector can be damaged if scan., was running great turned it off, went to start it again 2 seconds,... A 2002 Ford windstar SE van, with a 3.8 liter motor bracket for the next time I.. Browser before proceeding properly or at all controlling the engine computer ( PCM,... Are OK I have a 2002 Ford windstar SE van, with a new.! Appropriate OBD-II interface adapter and had rust marks coming out of it use same. Pins 4 and 5 attach at the same source for a five-volt reference code. What allows communication between your PCM and a particular module that it is functioning properly an! Dodge Ram 1500 11, 29 and 30 van, with a reman unit at same... And still can not connect source for a five-volt reference is missing failures! Fried, see the attached picture when attempts are made to communicate after fixing the wiring problem ways! For 125 buck and works fine wire bundle on the bracket for the time! Cable systems, the vehicle with other modules checked out by a professional a reman unit the!, crank but no start go through the process to re-set the app sensor, including the... A posting about how the wire bundle on the networks of the information contained in this browser for the time!