Car Maintenance, Automotive Service Technician | Pawlik Automotive

Car Maintenance, Automotive Service Technician | Pawlik Automotive


today we’re gonna do a diagnosis on a 2002 Acura 3.2 TL our clients complaint is that the check engine lamps on the vehicle otherwise runs fine we’re gonna go through the whole diagnostic process and you’re gonna get to see just what’s involved in diagnosing a check engine lap concern clients often are concerned about the cost of diagnosis they can’t quite understand you know what’s what’s involved can’t you just plug a computer and then tell me what’s wrong with it once we plug it in that only just gives us a direction for the information to actually find out what’s wrong we need to follow further tests the piece of equipment we’re gonna use today is our snap-on modus diagnostic tool we can scan the vehicle’s computer and from there we can get the basic information on what codes are stored in the vehicle computer from there we can also look at data stream sonar scan tool we’ve got several codes that are stored one of them the P 1676 I’m not certain of we’re gonna have to look that one up there’s several engine misfire codes from cylinders one four cylinder five cylinder six and there’s also a code for the evap system so we’re gonna take the vehicle on a road test and just find out what’s going on so we’ve been driving for a little bit and the engine doesn’t appear to be misfiring seems to be okay so as I’d mentioned when we had the scan tool hooked up to the vehicle we basically got trouble codes that are in three different systems of the vehicle first one we’ve got is this P 1676 which is a basically communication issue between the transmission computer and the vehicle computer the second issue we have all our PE 3:01 3:02 those are engine misfire codes the p 1456 evap code seems to be that the fuel cap has been a very common cause of failure on this vehicle so our first code we’re gonna look for is the 1456 evac code which is very commonly caused by a loose gas cap or a defective gas cap first thing we’re gonna do is just inspect the cap find out whether it’s tight enough or not and actually in this case it’s not very tight visually the caps seal looks fine cap looks okay so what I’m going to recommend is that we actually provides a client to make sure he keeps his fuel tank cap tight we’ve cleared the trouble codes if it returns that we’re gonna have to do further diagnostic on the system so for the next part of our diagnosis we’re gonna investigate the cause of those P 301 304 305 and 306 codes which are all engine misfire codes I’ve had a discussion with the client he doesn’t recall having had a spark plug to a place so that’s something we’re gonna have to look at we’re gonna do a visual inspection the ignition coils test the coils and visually inspect the spark plugs we’re going to start with removing the plastic engine cover to access the ignition coils one of my 1 we’re gonna take out the coils and our first step will be a visual inspection of the coils themselves we’re next going to remove and inspect the spark plugs plugs look good they’re not that old we’re now testing for spark with our spark tester as you can see the spark is not jumping the gap properly and that indicates the coils are bad we’re moving on to removing some additional engine covers and now we’re gonna test for vacuum leaks with our smoke machine smoke machine generates smoke and any leaks in the intake system will show up there are none present so that’s not a problem we’re also going to inspect the EGR valve it’s easy to remove on this vehicle so we’ll do a visual inspection and make sure there’s nothing causing a problem there the valve looks good so we’ll put it back in I’ve completed the diagnosis for the P 300 series trouble codes and what I found is that two of the ignition coils are bad we’re gonna replace the coils and clear the codes we’re removing the ignition coil now and installing the new coil do the final tightening and to complete the job we’re gonna put the plastic cover back on it’s time to go for a road test and check out our work we produced this video to show you what is involved in properly diagnosing and repairing a modern vehicle with the check engine lamp on the test procedures are different for every vehicle and every type of concern but the basic principle is still the same that it is not a matter of simply plugging in a diagnostic computer and having it tell us what is wrong the computer is only part of the diagnostic process giving us trouble codes and information that the vehicle computer seized from here we must test specific components and wiring circuits to find the real cause of the concern during this diagnosis you get to see both a simple and a complex diagnosis and we hope that this helps you understand what’s involved in properly diagnosing and repairing a modern vehicle


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