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I do concentrate on the diagnostics and a lot of the time schedule one of the neighboring shops to actually perform the repairs.
Mine: 1995 318ti Club Sport; 2020 C43; 2021 Sahara 4xe 1996 Speed Triple Challenge Cup Replica Wife's: 2015 X1 xDrive28i Son's: 2009 328i; 2018 330i xDrive
The truck as it sits right now has only two mils that will come on when attempting to start, SRS and Charge.
The security light flashes slow until the crank position, upon which it begins to flash fast.
The power windows, radio, and several other systems are all inoperative. There are no modules communicating on the data bus but a code P1630 can be retrieved. They have checked all of the connections and fuses and can't identify any thing wrong. For this exercise, the most important part is getting the schematics and pre-planning the testing, very similar to what you might recall from high school chemistry lab.
Try to determine which circuits need investigated first, second, and maybe third. How would you start your testing? Trying to guess one part or another will leave you stranded. Can you devise a strategy that will make analyzing this "easier"?
The rest of the story is this shop is the third to attempt to analyze the vehicle. The instrument cluster was physically damaged to the point that the circuit board was unrepairable, however replacing it still had the same conditions as before it was replaced. No Start, no crank, security light flashing fast. No power windows, HVAC blower operation, radio, or instrument cluster.
The shop owner pointed out this at the PCM.
There was similar wiring repair work under the dash including installation of an aftermarket remote start system.
The first question that needs an answer is, if none of the modules are communicating where did the trouble code come from? The PCM communicates on CAN data bus as does the instrument cluster and the ABS. The other modules are on the UBP bus. Connecting the scan tool revealed the only modules missing were the HVAC, Radio, and Instrument Cluster. The code that was setting in the PCM was described correctly as PATS information not received by the PCM, but the identifier was incorrect, it was really P1681.
For the radio, HVAC and power windows to operate the Instrument Cluster has to turn on the retained accessory power relay. The first check is to see what parts of that circuit are working and what parts are not. Relay testing is best thought of as two separate circuits, the control circuit and the controlled circuit. Power was available to the relay for both of those circuits. Completing the controlled side of the circuit allowed the windows and radio to operate. There was no command from the repaired cluster to turn the relay on.
All of the rest of the testing needed to be performed at the cluster with the connectors attached to the cluster.
About this time the shop owner asked if I could look at another car. A 2010 BMW 328i that the battery died on over the weekend. The customer had the car towed to a shop in the city who replaced the battery and got the car running but told her that she had to go to the dealer to have it reset. The instrument cluster had stopped working with the battery replacement and they told her that the "reset" would solve that as well.
Same routine. How do you prepare to work with this problem? What do you need?
The failure on the F150 that was preventing the instrument cluster from turning on was proven. Upon testing to see if everything then worked the truck cranked but would not start, everything else was fine. Pulling codes revealed a P1233 setting but no other codes.
Next?
BTW, total time for both the truck and the BMW, about 1.5hrs. That includes time to joke around a bit.
Mine: 1995 318ti Club Sport; 2020 C43; 2021 Sahara 4xe 1996 Speed Triple Challenge Cup Replica Wife's: 2015 X1 xDrive28i Son's: 2009 328i; 2018 330i xDrive
Mine: 1995 318ti Club Sport; 2020 C43; 2021 Sahara 4xe 1996 Speed Triple Challenge Cup Replica Wife's: 2015 X1 xDrive28i Son's: 2009 328i; 2018 330i xDrive
With the instrument cluster inoperative it cannot turn on the RAP ( retained power accessory) relay, so all of the testing needed to concentrate on the cluster. That means not only does it need to be removed for access the connectors need to be disassembled to the point that they can be attached to the cluster and allow the circuits to be back-probed. Powers and grounds need to be tested live under a load, which is not the way that trouble trees direct technicians to test. Static tests can quite often fail to reveal a fault, and that's all someone is doing with an ohm-meter when testing for grounds or continuity. Even voltage tests with no current load can show potential voltage, only to have a voltage drop occur when the circuit is under a load.
Seen here is the RH IPC connector with the posi-lock cover removed for access. The green wire tie is on the black/blue wire, pin 18 ground for the instrument cluster that had an 11v drop on it when it was connected to the cluster. Jumping that wire to ground allowed the cluster to turn on and turn on the RAP relay which powered up all of the known affected circuits at that point.
This was the point in time that it was discovered that even though the engine would now crank it still didn't start. I don't know if any of you can really relate to this but as a technician working for someone else similar results in the past would have had someone treating me (any tech) as if we had failed to diagnose "the problem". It seemed that it never failed that what ever was the last problem to be solved no matter how long the string, that was somehow supposed to be the only problem that the vehicle actually had. (There are plenty of threads here that reveal this tendency). Never mind the fact that prior to this point the engine didn't even crank because the security system had it shut down.
So the question now was why isn't it starting. The approach requires the tech to forget everything that has been done to this point and troubleshoot the problem at hand. To get an engine to run you must have spark, fuel, compression (including fresh air) and of course security system permission. Since the truck now cranked it was appropriate to check trouble codes again and that's when the P1233 was found. There was no fuel pressure and with a code for no communication from the fuel pump control module that's where the diagnostics headed next. The pump was confirmed to be OK, the module failed and a final quick test of bypassing the module had the truck running.
The BMW was next. It didn't make any sense that the cluster would be inoperative with the battery replacement, but either way the first thing to do is connect a scan tool and check for codes. The scan tool powers up off of the ALDL pin 16, and uses the pins 4 and 5 for grounds and it didn't turn on when connected. Testing showed no power to pin 16 in the ALDL, and troubleshooting that issue revealed the 5 amp fuse #74 had blown in the fuse center behind the glove box. Replacing the fuse restored the cluster operation as well as provided power to the scan tool. From there clear codes and perform the battery registration and she was ready to roll too.
Pardon me while I go swap my gas cap out.
Let's do this another way. How much are you willing to spend to try and find something that you don't even know exists? Do you even have the slightest clue as to the physical aspect that would come into play to try and manually search the affected circuit? Since you don't, why can't you leave the decision of when to chase and when not to up to the people who do?
I think if I were the shop owner I'd drive the car around for a bit before letting it out the door.
How much are you going to charge for that time?
How are you going to respond to any critics that call the road test "joy-riding", as well as gouging the customer for additional diagnostics when "all it needed was a fuse"?
If standard procedure for a technician is to "verify the complaint" BEFORE one solves the problem, and charge for that, then I don't see why you can't charge to verify the solution afterwards.
There are legitimate and not-so-legitimate charges. If a bolt is rusted, you charge extra to get the damn thing off, but if someone sends you the wrong part, that's not the customer's problem.
If it's still on a day later, I go to the parts store and pull the codes. If it's an "evap" code, I replace the gas cap.
If that fixes it, I'm done and don't care if it's the seal on the gas cap or if it's cracked or whatever.
A "real" tech would diagnose the issue and weld another gasket on there, right?
You got a plastic welder I presume?
Back to the point, you don't need to be a tech or a pro to search fixes and implement them. Most all of us have a laundry list of skills. We've tackled problems without any experience or training and we have many success stories. If nothing else, we have a frame of reference to use to try to understand the tech's diagnosis.
I solved one CEL by replacing the gas cap (used my code reader, got a small leak code).
Another by installing colder spark plugs (misfire)
Another warning light (air bag) by unplugging and cleaning the seat belt sensor on the passenger seat
Another warning light (TPMS) by checking and filling all four tires and resetting the system.
I'm 4 for 4 this past year!
Oh, stopped a sunroof leak by popping off the A Pillar trim and straightening out a kink in the drain tube.
I suppose if you pop a zit you are a dermatologist, brush your teeth you're a dental hygienist, watch the peoples court on TV and well,,, Do you have a microwave oven? Guess you're a chef.. Being able to do things doesn't equal skills. Are you trying to apply for a job with what you claim to be capable of doing? Would you be willing to pay a shop the rates they need to charge, for someone with exactly "your skills" and how long it would take him/her to accomplish a given task?
It must seem like good sport to continually waffle your perspective and adjust the finish line to suit your needs at any given moment. It's sad that you don't realize how that impacts a consumers perspective about what is really right as compared to what is not.
I'll say one thing, Doc. I know enough not to screw something up.
What kind of a statement is this really supposed to be? "It's okay to admit you have no idea why the fuse blew."
Nobody knows exactly why the fuse failed, nor when. It's a sign of incompetence to try and go anywhere beyond where this is at right now. You don't go out and drive it around, you darn sure don't go fishing and you don't waste time speculating. "IF" the fuse fails again then the circumstances change. If it doesn't then regardless I have done exactly what should have been done, BOTH WAYS.
You don't have the experience and insight to judge this (and a lot of other situations) correctly, it's OK to admit that and way past due. Anyone that proceeds in any fashion that contradicts how this BMW situation has been handled up to this point is at the very least incompetent, if not unethical.
"If a fuse blows in a circuit, you can almost guarantee that even if the problem is intermittent you'll see the same fuse fail again."
Otherwise nice link. Next time read it because what it says in the middle is.
"At first we were just popping in a new fuse and releasing the vehicle to continue its workday. But eventually we had to dig in and find out what was causing this problem. Searching down an intermittent short can be extremely time-consuming and a real headache."
The BMW isn't at eventually yet, and it might never be.
31.24mv. What is it? What does it mean?
The biggest reason that the majority left was that they couldn't make enough money. The common theme from the ones who went to the dealerships was that they started off on the lube rack and got to start growing in capability. The average wage for them was about eleven dollars per hour. Between six to nine months in, they all got switched to flat rate and were being assigned ever more complex work. This effectively buried them since they weren't ready to produce the hours and drove them from the bays. One of the kids went to work at McDonalds and is making more money than he did as a tech.
Should be a fun open house trying to get kids signed up for next year......
He was right. If you don't "love it" on some level, then get the hell out.
I'm also reminded of the difference between being a hobbyist and doing something for a living. Mark Twain has this line (paraphrase) about how delightful it is to walk up and down a mountain on a spring day, but that if if was your job to do everyday, you'd learn to hate it.
http://answers.edmunds.com/question-Why-dims-2005-C180-Kompressor-I-start-driving-The-brights-work-211488.aspx
Any chance this is related to the backup lights? How can putting a car in first gear turn off the headlights?
Wasn't I just saying something about running into stuff that you wouldn't be able to do at all? Talk about timing.
So what can cause the CAN bus to drop out? Isn't this strictly a matter of damaged wiring or connectors?
Let's take Steve's attempt to challenge whether it was appropriate to stop with the BMW as I did or proceed blindly. If I was a DIY'er that same post would not only not be questioned, it would be featured somewhere as being brilliant and it would have been used as a tool to criticize any shop who would have tested further and charged for the time as you suggested to do. Then we have the fact that when I posted it, it was only worthy of trying to find something wrong with it. You can use any reason you want to for that, probably blame me but the reality is that it's been that way long before I ever posted here. I am only guilty of doing what it takes to prove that this kind of bias has been going on for longer than I have been a technician. The list of what can cause a failure like this is so long, the engineers cannot write a trouble tree that could guide someone through the diagnostics. When communication fails, its also impossible to connect another computer to the system with software loaded on it that could ferret out the answer too. To solve these problems many "assume" that it is going to take an engineer. The funny thing about that is I've met some brilliant engineers that have designed things that the majority of us couldn't even imagine in a 1000 lifetimes and they wouldn't figure out that Mercedes low beam failure in a 1001. It's a lot of the same education, but a completely different application of it. Saying this another way, you can be taught to play a musical instrument, but you have to have talent to be a musician. I can type words on a computer screen, but that doesn't make me a writer. Being able to tighten or replace a gas cap whether it fixes "A" problem or not doesn't make someone a technician's peer.
As far as the Mercedes goes, until the initial discovery phase is completed which starts with a capable scan tool, the next step doesn't exist. Sort of like the missing insight with the BMW, fuses, and what 31.24mv really meant in context.
I am going to say something which will offend the civilization in general: Most people in the workforce act as though it is a hobby, at least 70-80% if not more. This is a disappointing reality.
Today I administer an enterprise class software product. The documentation for these is terrible and the development tutorials are just as bad. I was lucky and got hired because while every Fortune company has this product, there is no incentive to move from one company to another, so I was hired as a tech guy who will "figure this out along the way."
My first couple of years I worked late every single day. I had no idea that would be the case, and it was painful and not easy. Just like with mechanics, the day was filled with production, requests coming by phone, by e-mail, people stopping at the door and interrupting, just non-stop chaos during a period of huge growth of our company. At "clock out time" I noticed everyone else disappeared. So I figured out that at the end of the day I can poke around this systems and figure out from scratch, "How do I do this? How does this work? Is X capable in this product?" I added major study time to the role, on my own time. Yes we all know it is not fair not to get paid for extra hours, but the reality today is that this is a requirement. What people do not understand is that when you start a new role, you have just begun to go to school.
We have several divisions using this product. They all have people who have been administering it longer than I have. They all call me to find out how XYZ works! For a long time I figured these people were new or had just started with this software. Then I found out they all had 5+ years on me! One thing I noticed that they have in common: They leave at exactly quitting time. Can't do that. The IT role drives the hours. That long line coming out of the IT department at exactly quitting time? Most of those people cannot even have a decent conversation. They are utterly lost. Chair warmers. Refer to my statistic at the top of this post please.
One must be pummeled and dig their way out to get to a competent level.
I would tell these things to anyone starting out. Where do you want to be 5 years from now? Would you like to be the "go to" guy? You can get there. Would you prefer to be like most people who clock in, do the exact work assigned, then leave? You can be that person as well. Not to get religious on anyone, but Christ looked the agrarians in the eye and told them, whatever you put into that field is exactly what you will get out of it. He was acutely aware of man's laziness, and pointed it out to them. I think it is fair to say that mankind never, ever changes.
I know that dealerships are corrupt. From Ford, to Toyota, to Acura, every one has either charged for work they did not do, provide the incorrect parts, or charged me a corrupt rate. I am sure it would be just as terrible an experience to work there. But on the flip side of the coin, the populace has this fairy-tale like picture of work, and a sense of entitlement that someone is required to pay them certain wages and have certain conditions. That is nonsense.
My rule is: Starting a new role or business one must put in 50 hours as employee or 60+ hours as owner, per week for the first 5 years in order to reach a successful level. In this case that means donating 10 extra hours to the company in exchange for an education. Anything less will result in mediocrity or even failure.
Look, I don't like this fact. I am tired! Man I am tired! Ready to retire early! But for lack of a better expression, it is what it is.
Hi @guitarzan.
Thank-you. Nicely done. I'm pretty sure you can identify with the fact that as a tech working for someone else, I was the first one in the building and the last one to leave. There were periods of time that could run ten months without a single day off and on top of the hours in the shop there was another two or three spent studying everything I could get my hands on, only to find something else that I had never seen before when back at work.
Then came the 100 hour weeks. 50 to 60 hours in the shop and then travel to and present evening classes for other shops/techs anywhere from one to four nights in a week. Meanwhile I still had to make time for future class prep as well as study for my own continued improvement. All this while fully recognizing there is no finish line, there will always be more to learn, more tools to buy and not a penny left over to save towards retirement.
Take all of that and your line above that I quoted sums it up nicely. All that effort and what's left is we are still trying to figure it all out.