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Found 51 results

  1. Having a dead pedal issue on my 2002 24v auto. codes are p0122 p0236 p1475. problem is very intermittent. New apps sensor after confirming all apps power grounds and signals were good. when i have a pedal map and apps reading are were they should be, when problem is occurring map voltage is maxed out and apps signal is all over the place. Initially thought short between apps wiring and map wiring, could not find such short and did not notice change during wiggle test of harness nor could i measure continuity between apps and map circuit. Starting to think bad ecm, the problem did start after bleeding my low pressure fuel system getting diesel all over driver side of engine. Fuel pressure is good. If anyone could help that would be great.
  2. I have read here about the ground above the atarter for the ecm. will running a new ground from the battery to the ecm serve the same purpose or does the ground above the starter serve a greater purpose than just the ecm?
  3. Hey Guys, <<For a List of vendors who have supplied junk parts or didn't stand behind their products....see the bottom of the article.>> pepsi71ocean here. I decided to finally write this article up after another round of people with issues with reman companies. So a while ago back in 10/2015 I shorted out my PCM with a botched rebuild on my Alternator(I forgot to add a sealing washer!) As a result, after replacing the defective alternator I still had no charging on the alternator. I went hunting for a re builder for my PCM. I was quoted almost $800 for a new blank from Dodge, and that didn't include programming. A friend of mine on Facebook who runs a Diesel Rebuild shop in the Midwest forwarded me this company here. <<List of Verified and Reliable PCM/ECM Re-builders>> I have put the company in table format, but If you have another one you used then message me and I'll add the Info. Verified Re-builder Website Telephone Number of Rebuilds Type 1. Autocomputer Specialist https://autocomputerspecialist.com/ 1-954-513-8359 9 PCM-ECM-TIPM 2. Diesel System Services http://www.blacksmokin.com/ 1-619-749-6226 1 ECM 3. Reman Auto Electronics https://www.remanautoelectronics.com/ 1-855-466-6938 1 ECM 4. Crites Car Computers <pending clarification> https://www.critescore.com/ 1-800-900-3267 1 ECM 5. ECM Repair 1 http://www.ecmrepairs.com/ 1-800-737-0915 3 ECM-ABS? 6. SIA Electric http://siaelec.com/ 1-800-737-0915 1 ECM 1. AUTOCOMPUTER SPECIALIST: I was referred to them by my friend Stanley. In the end I believe the price for the rebuild was about $350. I called them, they emailed me the form to fill out with a brief description of the problem, then shipped my PCM to them. And when they opened it up they also sent me a photo and let me know what the issue was. Now they also gave me the list of possible wire issues, but I also knew that I was almost sure it was a botched alternator rebuild that I did on the one NAPA alternator. Here is the photo they sent me below. Total Turn time for me was 5 days and that included the shipping to and from their place in Florida. To date I have approximately 30,000 miles, and 4 years on this rebuild. To date I know of 4 other Dodge Cummins trucks running rebuild PCM's Although Stanley said he has sent out a dozen PCM/ECM's to them over time for customers from his shop, and that includes some medium duty stuff. UPDATE: 2. Diesel System Services: Referred by mopar1973member Bobalos. Main contact at DSS is Steven Bruce.. He used to work for Cummins. Member has verified ECM still runs. 3. Reman Auto Electronics: Referred by mopar1973member GSP7. Reman Auto Electronics is a subsidiary of Flight Systems Electronics Group. Recommendation by Cummins Fleet Mechanic as well. 4. Crites Car Computers: Referred by mopar1973member Ho$$. Currently I am seeing confirmation that it is not Crites Core Company, Inc. 5. ECM Repair 1: Referred by CumminsForum member indy1k, and 6. SIA Electric: Referred by CumminsForum member chansey NOTES: If you do send me a company, name the number of miles/years you have on your rebuild, and if they were easy to work with or not. If you could a short summary would be good as well. ---------------------------------------------------------------- <<From here below is a list of vendors who have failed to supply good product, or didn't stand behind their product>> Below here is a list of Vendors/re builders that have supplied problematic rebuilds, and have not made attempts to rectify the problem. I didn't have to do much searching online to discover lists of complaints. Re-builder Website Telephone #Complaints FlagShipOne(NY) http://www.fs1inc.com/ 1-516-766-2223 More then one 1 All Computer Resources(FL) https://store.allcomputerresources.com/ 1-866-699-5230 1-1(one guy bought here who didn't have issue) Automotive Scientific Inc. https://www.autoecu.com/ 1-866-983-6688 1 Carcomputer Exchange https://carcomputerexchange.com/ 1-888-875-2958 1 A-1 Cardone http://www.cardone.com/ 1-888-280-8324 6 Auto Computer Exchange https://www.autocomputerexchange.com https://www.autocomputerexchange.net 1-800-680-4275 3 NOTES: All Computer Resources(FL): One member has bought from here with no issue as of 12/16/2018. However they still have one negative review. I hope this list will help people avoid a potential nightmare in dealing with computer issues in the future. UPDATED 01/19/2019 by John Armstrong Jr. Revision 2.1
  4. I recently had Dead pedal problems. Also Wait to Start (wts) light is not coming on. Now I have no lift pump noise before starting truck. Or after bumping the starter. I changed the APPS and that fixed the dead pedal only. Now I tried hooking up programmer to check codes and the programmer won't load up with key on. After 20 seconds or so the odometer says NO BUS. So I'm 95% sure the ECM is shot. I bought a used ECM. Auto trans, same year. I have called 6 dealers, NOBODY has DRBIII software anymore to reprogram it to my vin. The software has all been updated to some new carp. So. Will my truck run and drive if I just swap ECM's? I've read conflicting stories. A lot of them say Yes just swap it.
  5. First time posting, I've used your advice on many previous issues reading different forums and such. Hopefully you can shoot a clear answer for me here cause I'm stuck. 1999 Dodge Cummins, I've had periodic dead pedal for the last 2 years. Would drop to an idle at highway speed and no throttle response. Shut truck off, turn back on, problem went away. Now the truck is stuck at a slightly high idle at 1,100 RPM. No Throttle response at all. I just replaced APPS with Napa replacement. No different. -Vp44 replaced 3 years ago Some other history: -one day no gauges worked and got (No Bus) on odometer. Next day "problem fixed itself" -A month ago the Wait to Start light would not come on before start up. But once running voltage would draw like grid heater was working while running. A week later "problem fixed itself". Wait to Start works fine. So after this extremely long post (sorry) are these symptoms of a faulty ECM??
  6. 1998 cummins 5.9 24v having problems with po113 code, cannot erase, IAT sensor reads -40 in live data. That reading dose not change if i unplug the sensor, leave it plugged in, or put a jumper in the IAT plug, it reads -40 no matter what. I am pulling 4.8v on my multimeter at the IAT plug with both test leads in connector. I put a 2.7k ohm resistor in IAT plug and i can clear the po113 code and run truck, forcing IAT to read around 114. How ever something is forcing the truck into high idle and then what i believe to be 3 cyl high idle. It dose this if i run truck without resistor in and check engine light on to. I have checked continuity on both IAT conector wires back through ecm plug, along with the wires for the CTS and MAP sensor. They all tested good when i ohm tested them. I have also replaced the IAT sensor CTS and MAP sensor. I pulled IAT sensor and check resistance on it and it seemed good still as the reading dropped when i put heat to it with blow dryer. I also took alternator to local Oreillys and had it bench tested 6 times and it passed every time, (i knew for sure it was charging but thought maybe bad diode.) Also have to brand new batteries, and have researched ground locations and cleaned every single one to shinny metal.The truck also has smarty but programmed to stock, along with edge juice with aditude which is completely disconnected. However before i disconnected it completely it said the ecm was getting 14.2 volts with truck running is that normal? Also the truck has a high idle kit of some sort installed but it works fine, actuator type mounted under throttle housing. It only allows high idle at 1200 rpm and works fine whe. Engaged and dis engaged. I have run out of ideas any input would be greatly appreciated.
  7. I'm replacing this wire: The wire is a shielded twisted-pair with a drain (SAE J1939/11). The wire seen here is the stock wire. It's comically unkempt. Note that the orange wire is about five inches too long, so that it must be doubled-back to make it the proper length. Also, the shielding is missing from the first six inches, and the last four inches. Neither of these is a problem from a functionality standpoint. I mean, it probably doesn't hurt anything. It's just sloppy. That loose twist of shielding provides no benefit, so why did they leave it loose like that? This is what I made to replace it. All new wire and connectors. It was hard to find a short length of J1939 wire. I found a few sources that were happy to sell me a 250ft spool, but I wasn't happy enough to buy it. I found a guy on ebay selling teflon/silver shielded twisted pair. $35 bought me 25ft. I wasn't trying to get silver. In fact, I wouldn't have bought it if I had realized that this is what it was. However, this is remarkable wire, so I'm going to give it a try. It's temperature rated to 200ºC. I don't know if it's oil rated.
  8. I contacted Cummins to see about a replacement ECM. They have them for $2700. The 3946242RX part number also goes by ENCORE CM551A. But then I also see a 3942860RX (CM550) that also claims to work with a VP44 for $1500. And also a 3944124RX for $1300. But these other two, I have no compatibility info on. I love how the overnight shipping for a 5 lb. part is $250.
  9. I've done the P1689 troubleshooting steps. I made it to the end of step #8. According to the steps, that means my ECM is bad. In keeping with the idea that "it's probably not the ECM," I've been trying to double-check the communication between the ECM and the VP44. I tried to put an oscilloscope on the VP44 today, to see if I could see the data. If I see the ECM's data, then it's the VP44 computer, not the ECM. I saw something that looked like PCM data, but I couldn't figure out how to set a stable trigger on it. I put channel #1 on the black & white wires (Pins 1 & 2), and put channel #2 on the green wire (Pin 8). Then I tried to trigger off of channel #2. If I tuned the trigger just right, it would hold-still for a couple seconds. I was expecting that the green wire (sync signal) would provide a perfect trigger. Does anyone know the correct scope setup to see this signal?
  10. My truck died in the driveway several months ago. I ran it for a couple minutes to move it to the driveway. When I went to start it an hour later, it wouldn't start. I've since been tinkering with it for months. Replaced lift pump relay. Replaced fuel filter. Tested lift pump pressure (10psi, low, but should start) Unplugged and re-plugged: VP44, PCM, VP44 relay, apps, various connectors I could reach Replaced batteries with brand new. Added 5 gallons of fresh fuel. Originally, there wasn't anything I could do to start the truck. Then I learned how to hotwire the VP44 and the lift-pump relay. I was able to start the truck this way. However, if I barely touched the accelerator, it would jump up to a high idle, and stay there. After all my tinkering, I'm at the point where I can start the truck now without hot-wiring anything. Turn key to run, until wait light goes out. Turn key to start, just a blip. (to start the lift pump) Wait five seconds. Turn key to start. But I still have this problem where all I get is idle, and high-idle. I've tried doing the procedure for resetting the apps, but just once. Did I I've done some bench testing on my apps. For the things I can check while it's disconnected, that seems fine. The wiper/resistance looks smooth on my needle volt meter. What's next? Thank you, -Mark
  11. Hey Guys, <<For a List of vendors who have supplied junk parts or didn't stand behind their products....see the bottom of the article.>> pepsi71ocean here. I decided to finally write this article up after another round of people with issues with reman companies. So a while ago back in 10/2015 I shorted out my PCM with a botched rebuild on my Alternator(I forgot to add a sealing washer!) As a result, after replacing the defective alternator I still had no charging on the alternator. I went hunting for a re builder for my PCM. I was quoted almost $800 for a new blank from Dodge, and that didn't include programming. A friend of mine on Facebook who runs a Diesel Rebuild shop in the Midwest forwarded me this company here. <<List of Verified and Reliable PCM/ECM Re-builders>> I have put the company in table format, but If you have another one you used then message me and I'll add the Info. Verified Re-builder Website Telephone Number of Rebuilds Type 1. Autocomputer Specialist https://autocomputerspecialist.com/ 1-954-513-8359 9 PCM-ECM-TIPM 2. Diesel System Services http://www.blacksmokin.com/ 1-619-749-6226 1 ECM 3. Reman Auto Electronics https://www.remanautoelectronics.com/ 1-855-466-6938 1 ECM 4. Crites Car Computers <pending clarification> https://www.critescore.com/ 1-800-900-3267 1 ECM 5. ECM Repair 1 http://www.ecmrepairs.com/ 1-800-737-0915 3 ECM-ABS? 6. SIA Electric http://siaelec.com/ 1-800-737-0915 1 ECM 1. AUTOCOMPUTER SPECIALIST: I was referred to them by my friend Stanley. In the end I believe the price for the rebuild was about $350. I called them, they emailed me the form to fill out with a brief description of the problem, then shipped my PCM to them. And when they opened it up they also sent me a photo and let me know what the issue was. Now they also gave me the list of possible wire issues, but I also knew that I was almost sure it was a botched alternator rebuild that I did on the one NAPA alternator. Here is the photo they sent me below. Total Turn time for me was 5 days and that included the shipping to and from their place in Florida. To date I have approximately 30,000 miles, and 4 years on this rebuild. To date I know of 4 other Dodge Cummins trucks running rebuild PCM's Although Stanley said he has sent out a dozen PCM/ECM's to them over time for customers from his shop, and that includes some medium duty stuff. UPDATE: 2. Diesel System Services: Referred by mopar1973member Bobalos. Main contact at DSS is Steven Bruce.. He used to work for Cummins. Member has verified ECM still runs. 3. Reman Auto Electronics: Referred by mopar1973member GSP7. Reman Auto Electronics is a subsidiary of Flight Systems Electronics Group. Recommendation by Cummins Fleet Mechanic as well. 4. Crites Car Computers: Referred by mopar1973member Ho$$. Currently I am seeing confirmation that it is not Crites Core Company, Inc. 5. ECM Repair 1: Referred by CumminsForum member indy1k, and 6. SIA Electric: Referred by CumminsForum member chansey NOTES: If you do send me a company, name the number of miles/years you have on your rebuild, and if they were easy to work with or not. If you could a short summary would be good as well. ---------------------------------------------------------------- <<From here below is a list of vendors who have failed to supply good product, or didn't stand behind their product>> Below here is a list of Vendors/re builders that have supplied problematic rebuilds, and have not made attempts to rectify the problem. I didn't have to do much searching online to discover lists of complaints. Re-builder Website Telephone #Complaints FlagShipOne(NY) http://www.fs1inc.com/ 1-516-766-2223 More then one 1 All Computer Resources(FL) https://store.allcomputerresources.com/ 1-866-699-5230 1-1(one guy bought here who didn't have issue) Automotive Scientific Inc. https://www.autoecu.com/ 1-866-983-6688 1 Carcomputer Exchange https://carcomputerexchange.com/ 1-888-875-2958 1 A-1 Cardone http://www.cardone.com/ 1-888-280-8324 6 Auto Computer Exchange https://www.autocomputerexchange.com https://www.autocomputerexchange.net 1-800-680-4275 3 NOTES: All Computer Resources(FL): One member has bought from here with no issue as of 12/16/2018. However they still have one negative review. I hope this list will help people avoid a potential nightmare in dealing with computer issues in the future. UPDATED 01/19/2019 by John Armstrong Jr. Revision 2.1 View full Cummins article
  12. Hi, Anyone know a source for buying RAM chips for Cummins ECM 3942336? Thanks. Leaky
  13. Upfront: I apologize for the length but I am exhausted. I am nearly convinced my 99 is too old for parts support, or I’m the ONLY one to experience a FAILED 98.5-2002 ECM. I have dedicated days and nights searching the Internet for a REBUILDER with phone follow-ups. The Internet is abound with enticing websites, pictures of pristine Integrated Circuit Boards, immaculate state-of-art facilities, complete with "experts" in uniform lab coats, headgear, and nitrate gloves peering into high powered microscopes - methodically examining/testing every component to exacting standards. Each facility promises the "perfect", “tested under all conditions”, "sleep well at night" product. All you need to provide is your VIN, Transmission, ECM Code and … your CREDIT CARD information. Prices range from $236 for a “repair” to a RECON $2334.90 + 303.75 core available in 24 at Cummins. And least I not forget the bone yards…which now seek all the market will bear. For example: There’s one on EBay for 900+ and…they want a CORE in return. Curious, I even drove some distance and visited one of these "future technology" facilities. In all honesty, it was nothing but a defunct run-down warehouse with questionable equipment/qualifications. Reviews are no help. EBay might give a facility glowing reviews, but when you drill down to the local reviews (I.e. Yelp), some actually start out with "Buyer Beware". Many reviewers claim poor/rude communication experiences, multiple returns with endless accounts of Emails/phone calls not being answered/returned. Some comments substituted random alpha-numeric characters for their expletives. Included were experiences whereby the Seller/Builder tried to skirt the coveted “Lifetime Warranty” carrot. Alas, my question to Forum: Has “anyone” used an ECM rebuilder/supplier that actually provided a reputable product, willingly kept their word, and stood behind it? If so, how long has the replacement been in service and were there any issues and finally a name please? I'll even take secretive recommendations via PM. Thanks. Leaky
  14. Hi, Do not want to wrongly blame ECM much less buy one needlessly. Lot of articles and Truckers say ECM’s rarely go bad. So, one last sanity check to be sure. My understanding is as follows: - WTS should “always” illuminate immediately after switch is turned on. (I’m told it indicates computer has “booted” up.) - Once WTS goes off, I should “always” be able to bump engine and hear LIFT pump cycle for 25s. Q1. Should the above events take place every single time? What I know: Batteries are good. Charged and tested with DEAD Load tester. Alternator is charging. Noise is .03-.04 max. (Not perfect, but don’t believe it’s a show stopper.) ALL grounds were lifted, cleaned to brightness, greased, and retightened. Stock truck: Only work -outside of maintenance- is: Installed: 1) mechanical Fuel Pressure gauge. 2) FASS LIFT pump – relocated from engine to tank 3) “Protected” Isolation relay (NAPA AR272) to power LIFT Truck bought used. Not 100% sure WTS came on instantly day of purchase. (my BAD) I know it came on. I would wait for it to go out and then start engine. Truck started and ran fine. Installed FP gauge, discovered low pressure, replaced/replumbed LIFT with Isolation relay, truck started and ran fine. Then, once after it sit for 2 weeks, I discovered the LIFT would not cycle after engine bump nor start. Pump works fine with direct power. Relay swapped, same problem. This morning, I attempted to START truck. Turned key on, it took 5s (1001, 1002 etc.) for WTS to come on. I bumped engine, LIFT pump cycled and built pressure. Turned key off and back on. WTS came on after count of 9s. Sometimes, I turn the key on and there is no WTS. I bump engine, and there is no LIFT pump action. No Check Engine Light, and NO CODES. Using an ACTRON CP9670. I’ve looked at BASIC mods done, took a week, reviewed again, and find nothing wrong. One last question. Q2. Can anyone speak to a known quality rebuilder? Thanks. Leaky
  15. Hello, I have followed this forum for years but just joined today. Because i've got a sad sad story. I hope you guys dont get this code. Looking for some help maybe. Reading over the forums from this site and cumminsforum, i now fear my ecm has died. Truck running fine after 45 min freeway drive. Get off freeway and truck starts to act funny. Gauges going ape ****(including temp gauge going full hot and then back to cold). Pedal goes more and more unresponsive. (dead pedal). Rpm's are uncontrolled. Truck Rpm all over the place. Truck lost its marbles. In limp mode with rms going full retard.(never go full retard) limp it rest of the way home. Idle home in first gear up steep *** hill . Thinking vp pump computer has died for sure. But no it doesn't look like pump, My Codes from the reader. 0606-very bad code (ecm failure) and a bunch of high input codes. that i'm guessing don't mean **** after the 0606. ,0113,0118,0123,0121,0238. Testing truck -truck will run for a few minutes. with no codes. When its warms up the rpm/gauge issues and codes come back. -I have check alternator for ac noise. I have run truck with 140 alt fuse pulled. Bought a new alternator that i will use later with new ecm. Just in case.... -I have checked apps sensor for fluctuation when truck rpm goes up on its own. Voltage does not move. (check with analog meter). lt Blue with black tracer to ground. -checked/cleaned a bunch of grounds including one by pass side battery. Thinking about taking ecm off to polishing up the surface of engine and computer.? Checking more for bad wiring, intermittent grounding someplace maybe....? What do you guys think? Ecm Toast for sure? Could it be in the Pcm? Where Can i find a good replacement or repair? Nobody seems to sell new ones. They all need to be programmed with right vin. Some ebay sellers have them up for 800 bones. But idk 2002 5.9 5 speed. Mods- raptor lift pump 1/2 inch lines. S@b Intake. Edge mileage max. gauges. 140k miles on truck
  16. Dead again! Error codes with 3X key method P1693, P0215, P0521 Innova 3100 Code reader shows nothing.... P0215 shows fuel relay, I checked the PDC with a test light and I have power to the pin labeled 87. The relay showed 80 ohms between 87 and 86. P1693 ECM. P0521 oil pressure switch. The engine will not turn over, all the dash lights goes dead when I try to start, there is a very faint wait to start light . Even with a battery charger set to 80 amp jump mode, there is a huge drain somewhere. The grid heater wires are not getting hot either. I checked the other relays and I saw nothing major. Grid heater relay maybe? I was going to go boating on the 4th but the POST ruins another weekend. I hope y'all's trucks are doing better than mine. Thanks Have a Happy 4th of July! Independence Day! P. S. Just think folks, if not for the 4th we would have been part of the EU and Brexit
  17. CCD (Chrysler Collision Detection) Data Bus Description The Chrysler Collision Detection (also referred to as CCD or C2D ) data bus system is a multiplex system used for vehicle communications on many Chrysler Corporation vehicles. Within the context of the CCD system, the term “collision“ refers to the system’s ability to avoid collisions of the electronic data that enters the data bus from various electronic control modules at approximately the same time. Multiplexing is a system that enables the transmission of several messages over a single channel or circuit. Many Chrysler vehicles use this principle for communication between the various microprocessor based electronic control modules. Many of the electronic control modules in a vehicle require information from the same sensing device. In the past, if information from one sensing device was required by several controllers, a wire from each controller needed to be connected in parallel to that sensor. In addition, each controller utilizing analog sensors required an Analog/Digital (A/D) converter in order to “read“ these sensor inputs. Multiplexing reduces wire harness complexity, the sensor current loads, and controller hardware because each sensing device is connected to only one controller, which reads and distributes the sensor information to the other controllers over the data bus. Also, because each controller on the data bus can access the controller sensor inputs to every other controller on the data bus, more function, and feature capabilities are possible. In addition to reducing wire harness complexity, component sensor current loads and controller hardware, multiplexing offers a diagnostic advantage. A multiplex system allows the information flowing between controllers to be monitored using a diagnostic scan tool. The Chrysler system allows an electronic control module to broadcast message data out onto the bus where all other electronic control modules can “hear” the messages that are being sent. When a module hears a message on the data bus that it requires, it relays that message to its microprocessor. Each module ignores the messages on the data bus that are being sent to other electronic control modules. With a diagnostic scan tool connected into the CCD circuit, a technician is able to observe many of the electronic control module function and message outputs while; at the same time, controlling many of the sensor message inputs. The CCD data bus, along with the use of a diagnostic scan tool and a logic based approach to test procedures, as found in the Diagnostic Procedures manuals, allows the trained automotive technician to more easily, accurately and efficiently diagnose the many complex and integrated electronic functions and features found in today’s vehicles. Operation The CCD data bus system was designed to run at a 7812.5 baud rate (or 7812.5 bits per second). In order to successfully transmit and receive binary messages over the CCD data bus, the system requires the following: Bus (+) and Bus (–) Circuits CCD Chips in Each Electronic Control Module Bus Bias and Termination Bus Messaging Bus Message Coding Following are additional details of each of the above system requirements. Bus Circuits The two wires (sometimes referred to as the “twisted pair”) that comprise the CCD data bus are the D1 circuit [Bus (+)], and the D2 circuit [Bus (–)]. The "D" in D1 and D2 identify these as diagnostic circuits. Transmission and receipt of binary messages on the CCD data bus are accomplished by cycling the voltage differential between the Bus (+) and Bus (–) circuits. The two data bus wires are twisted together in order to shield the wires from the effects of any Electro-Magnetic Interference (EMI) from switched voltage sources. An induced EMI voltage can be generated in any wire by a nearby switched voltage or switched ground circuit. By twisting the data bus wires together, the induced voltage spike (either up or down) affects both wires equally. Since both wires are affected equally, a voltage differential still exists between the Bus (+) and Bus (–) circuits, and the data bus messages can still be broadcast or received. The correct specification for data bus wire twisting is one turn for every 44.45 millimeters (1 3⁄4 inches) of wire. CCD Chips In order for an electronic control module to communicate with the CCD data bus, it must have a CCD chip (Fig. 5). The CCD chip contains a differential transmitter/receiver (or transceiver), which is used to send and receive messages. Each module is wired in parallel to the data bus through its CCD chip. The differential transceiver sends messages by using two current drivers: one current source driver, and one current sink driver. The current drivers are matched and allow 0.006 ampere to flow through the data bus circuits. When the transceiver drivers are turned On, the Bus (+) voltage increases slightly, and the Bus (–) voltage decreases slightly. By cycling the drivers On and Off, the CCD chip causes the voltage on the data bus circuit to fluctuate to reflect the message. Once a message is broadcast over the CCD data bus, all electronic control modules on the data bus have the ability to receive it through their CCD chip. Reception of CCD messages is also carried out by the transceiver in the CCD chip. The transceiver monitors the voltage on the data bus for any fluctuations. When data bus voltage fluctuations are detected, they are interpreted by the transceiver as binary messages and sent to the electronic control module’s microprocessor. Bus Bias And Termination The voltage network used by the CCD data bus to transmit messages requires both bias and termination. At least one electronic control module on the data bus must provide a voltage source for the CCD data bus network known as bus bias, and there must be at least one bus termination point for the data bus circuit to be complete. However, while bias and termination are both required for data bus operation, they both do not have to be within the same electronic control module. The CCD data bus is biased to approximately 2.5 volts. With each of the electronic control modules wired in parallel to the data bus, all modules utilize the same bus bias. Therefore, based upon vehicle options, the data bus can accommodate two or twenty electronic control modules without affecting bus voltage. The power supplied to the data bus is known as bus biasing. Bus bias is provided through a series circuit. To properly bias the data bus circuits, a 5 volt supply is provided through a 13 kilohm resistor to the Bus (–) circuit (Fig. 6). Voltage from the Bus (–) circuit flows through a 120 ohm termination resistor to the Bus (+) circuit. The Bus (+) circuit is grounded through another 13 kilohm resistor. While at least one termination resistor is required for the system to operate, most Chrysler systems use two. The second termination resistor serves as a backup (Fig. 7). The termination resistor provides a path for the bus bias voltage. Without a termination point, voltage biasing would not occur. Voltage would go to 5 volts on one bus wire and 0 volts on the other bus wire. The voltage drop through the termination resistor creates 2.51 volts on Bus (–), and 2.49 volts on Bus (+). The voltage difference between the two circuits is 0.02 volts. When the data bus voltage differential is a steady 0.02 volts, the CCD system is considered “idle.” When no input is received from any module and the ignition switch is in the Off position for a pre-programmed length of time, the bus data becomes inactive or enters the ”sleep mode.” Electronic control modules that provide bus bias can be programmed to ”wake up” the data bus and become active upon receiving any predetermined input or when the ignition switch is turned to the On position. Bus Messaging The electronic control modules used in the CCD data bus system contain microprocessors. Digital signals are the means by which microprocessors operate internally and communicate messages to other microprocessors. Digital signals are limited to two states, voltage high or voltage low, corresponding to either a one or a zero. Unlike conventional binary code, the CCD data bus systems translate a small voltage difference as a one (1), and a larger voltage difference as a zero (0). The use of the 0 and 1 is referred to as binary coding. Each binary number is called a bit, and eight bits make up a byte. For example: 01011101 represents a message. The controllers in the multiplex system are able to send thousands of these bytes strung together to communicate a variety of messages. Through the use of binary data transmission, all electronic control modules on the data bus can communicate with each other. The microprocessors in the CCD data bus system translate the binary messages into Hexadecimal Code (or Hex Code). The hex code is the means by which microprocessors communicate and interpret messages. When fault codes are received by the DRBIII scan tool, they are translated into text for display on the DRBIII screen. Although not displayed by the DRBIII for Body Systems, hex codes are shown by the DRBIII for Engine System faults. When the microprocessor signals the transceiver in the CCD chip to broadcast a message, the transceiver turns the current drivers On and Off, which cycles the voltage on the CCD data bus circuits to correspond to the message. At idle, the CCD system recognizes the 0.02 voltage differential as a binary bit 1. When the current drivers are actuated, the voltage differential from idle must increase by 0.02 volt for the CCD system to recognize a binary bit 0. The nominal voltage differential for a 0 bit is 0.100 volts. However, data bus voltage differentials can range anywhere between 0.02 and 0.120 volts. Bus Failure The CCD data bus can be monitored using the DRBIII scan tool. However, it is possible for the data bus to pass all tests since the voltage parameters will be in “range“ and false signals are being sent. There are essentially 12 “hard failures“ that can occur with the CCD data bus: Bus Shorted to Battery Bus Shorted to 5 Volts Bus Shorted to Ground Bus (+) Shorted to Bus (–) Bus (–) and Bus (+) Open Bus (+) Open Bus (–) Open No Bus Bias Bus Bias Level Too High Bus Bias Level Too Low No Bus Termination Not Receiving Bus Messages Correctly Refer to the appropriate diagnostic procedures for details on how to diagnose these faults using a DRBIII scan tool. Bus Failure Visual Symptoms & Diagnosis The following visible symptoms or customer complaints, alone or in combination, may indicate a CCD data bus failure: Airbag Indicator Lamp and Malfunction Indicator Lamp (MIL) Illuminated Instrument Cluster Gauges (All) Inoperative No Compass Mini-Trip Computer (CMTC) Operation Wiring Diagrams
  18. My 2000 Ram gave codes P0606, P0121, & P0123 when temperature below about 20 DegF about three weeks ago and I knew P0606 was the death code for ECM. I had "dead pedal" after some surging but I could idle it fo 15 minutes and as the block warmed up it worked.I was somewhat surprised there is not a dealer ECM available for this truck in all of Canada and they are about $2,100 list for a REMAN that originates from Cummins. My only recourse was to buy a wrecker ECM but the Dodge expert mechanic assigned to software warned me the ECM VIN has to match the other modules or this leads to future problems with replacing other modules. He said he could not change VIN himself with DRBIII, StarScan, or current WiTech software tools from Chrysler Corp. I decided to do extensive research on the internet and realized the Smarty S03 was a powerful programming tool for the ECM and emailed Bob Wagner in MADD electronics on ability to change VIN. He wrote back that the "recovery procedure" will take the static program image in the ECM and pull the VIN from the ABS unit to recopy to the executable image in the ECM flash memory. I was all set to buy it at $800 but I already had the Puck and decided to talk to the Dodge mechanic again and relayed all I learned about the "recovery procedure" and that I planned to buy it. It was like a light bulb turned on but he did not say much except to "bring it in". Two days later the used ECM was in my truck and working perfectly but I never did get to talk to him again as dealers do not like the nonchargeable time. I can only guess that the DRBIII "recovery procedure" does exactly the same thing as the Smarty. My belief is that Dodge fortified their flash update software so that only blank ECM's could be flashed with fresh software unless there is a TSB for new software update outstanding. This was done to ensure only Dodge supplied parts could be used. Cummins has the ECM on a "restricted status" (CumminsQuickServe online) and only Chrysler Corp can buy them. By the way I still have the old ECM and I believe the +5 volt supply to the APPS was the cause of the fault. The power supply circuit to regulate battery voltage to +5 volts is usually only a 3 terminal chip like the LM7805 regulator (Texas Inst) but requires an electrolytic capacitor on input and output terminal to ground. These electrolytics are the most unreliable components on the board and heat of an engine block ages it exponentially faster. I may make an attempt to fix it but surface mount boards usually require special equipment due to small spacing. By the way you can get a free account on Cummins QuickServe and it will cross reference any Cummins engine number to the Dodge VIN and visa versa, which is great when looking at wrecker engine parts to make sure options are same like the 47RE. I took the donor VIN to the dealer to make sure options matched. If you want to see all the Cummins part numbers (and superseded numbers) for your truck just enter one known Cummins part number on the "XReference" entry and ALL the rest will show with a diagram! You will get a list of engine vintages but choose one closest and before your build date.
  19. hey, i am getting the p0122-(pedal position sensor voltage too low) trouble code with check engine light on my 24 valve cummins. i did the diagnostic procedures listed on this website for that trouble code, on steps 4 and 5 of the listed procedures i got an "O.L" reading on my DVOM which means "open line" i guess? can any one tell me what this means or what i need to do to fix my dead pedal issue (always at beginning of the gear if it happens) ? im pretty new to this cummins and this website. any responses would great! thanks. STEPS 4 and 5 4. Ensure APPS connector is still disconnected. Disconnect ECM connector. ECM is located on driver's side of engine, just in front of fuel transfer pump and contains a 50-pin connector. Measure resistance between ground and terminal No. 3 (Light Blue/Black wire) on APPS connector. If resistance is greater than 5 ohms, go to next step. If resistance is 5 ohms or less, repair short to ground in Light Blue/Black wire. 5. Ensure APPS and ECM connectors are still disconnected. Measure resistance between ground and terminal No. 5 (Dark Blue/White wire) on APPS connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Blue/White wire.
  20. Ok... I've followed most of the steps (yes only most) but I get to Number 8 on this diagnostic tool and I get 44.2k ohms.... a bit more than the 5 or less suggested value. Where is the best place to purchase a replacement or have mine rebuilt?? Thanks, Tim http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes/175-p0336-crankshaft-position-sensor-signal 8. Ensure CKP sensor connector and ECM connector are still disconnected. Using ohmmeter, checkresistance between ground and terminal "C" (Gray wire) on CKP sensor connector. If resistance is 5 ohms or more, replace ECM. Perform TEST VER-5A . If resistance is less than 5 ohms, repair short to ground on Gray wire between CKP sensor and ECM. Perform TEST VER-5A .
  21. Hi, I just joined this site but had visited it for a while now. Lots of good info,Thank you!!! I have found similar threads related to my issue, but seems like thread ends before the problem is resolved or 99% of the time everybody narrow it down to junk vp. I got a 2002, 2500, 6spd, 4x4, qwd cab, with 130k, air dog, 100hp injectors, 3.55 gears, qwad with pulse, 5" pipe, Problem I'm having is driving on highway over 65mph pulling a trailer(rated 14k gross but about 8-10k total) at steady speed , when going up hill truck starts to surge but not much it's noticeable enough to know there is a problem. And if i turn up the fuel box up it gets worse. so it tells me it's fuel related. i got this truck a few years ago, and previous owner has changed vp under warranty, and at that time he put air dog, it may have 30k on pump. i change fuel filter once a year, but only put about 3-5k ml on it a year. other than that it runs relay good starts right up has plenty of power. i thought maybe it could be that transistor in vp but nut sure if i should have codes or can it be bad and not have codes. Any help would be highly appreciated!
  22. thank you for looking, this is my first post after joining this forum. I have owned this CTD for a few months after purchasing it from a private seller and is my first diesel. my problems currently have started with loaning the truck to my younger brother to take to school. He left the lights on all day and came back to a dead truck. I believe while having jumper cables hooked up he was able to crank it over but had no start. it is cold but i filled with winter blend the night before, no gauges installed yet but i have a FASS titanium. my brother determined the alternator was bad (not sure how), it was bench tested as 'good' from O' Rileys although they do not test for AC interference. the most intriguing information i can relay is that my scan gauge2 volt reading shows 11.8 when the dash meter shows nothing as the truck is running. the SC2 readout does not fluctuate. other pertinent information is that i recently had my auto trans swapped and batteries tested, i got the truck back with codes 113, 380, 382. the relays may be stuck, the 140 amp alt. fuse may be blown. it is frustrating as i am not able to get to the truck to do any diagnostics of my own like take grid heaters out of the loop or run a multimeter around it. the truck is a 2002 24v. where does the SC2 get its information from? any suggestions on what to try would be much appreciated.
  23. Trucks been throwing the 1689 code. I started to test the truck to see how often it throws the cel. 1689 every time. It will cut the power for a few seconds EVERY time it hits 2500ish rpms, it only happens at 2500rpm's. why would it be doing it at a specific rpm? I thought for a while it was only doing it under hard acceleration but its cutting out at 2500?????? Any ideas???
  24. so i wanna turn on the cold weather high idle on my truck and have access to a drb3 with all the chrysler software. when i go to turn it on it refuses to connect with the ecm, then i read somewhere it wants you to have the latest update before it'll let you make those changes. so far the drb3 has only been used as a scantool so no one has any idea how to reflash it. from my understanding i need a memory card with the update software on it, but not sure where or how to get it. i also have numerous cds with the title ITIL/ISIS from chrysler but i think these just updates for the drb3 itself and don't contain updates for vehicle ecms. however correct me if i'm wrong, lookin for some info, thx
  25. Throwing this out there.... could you remove the dodge ecm and wire harness and replace it with a regular isb ecm & wire harness? ive been looking at diagrams and the dodge/isb only has 1 50 pin connector while the non dodge ecm has 2 50 pin connectors, and on that 2nd connector could you do more with (extra features that dodge didnt seem to want us to have which bother me). I've just been thinking outside the box lately, traveling the path less taken.I need to get the Cummins Inline 5 or 6 at some point to, see what I can do with the Insite program (yes i have all the levels of licensing and the licensing for password removal & oem password removal), Also I have the InCal files to play with. If that fails i'll have to find (which hasnt been easy) Cummins CalTerm III (Cummins Enginerring Software), which you can edit calibrations will push an uncalibrated flash file on to the ecm (unlike Insite that will only work will calibrated files).Don't know if I'm chasing a dragon, trying to reinvent the wheel or wasting time, and yours too for reading this brainstorm.
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