We have here a 2005 Mazda 6. I was called in for a crank-no-start. It has a code P0335 for the Crankshaft Position sensor. When I got there, the car was starting and stalling, almost like a security issue. I soon found out that this code was pretty misleading! Hope you enjoy!
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Very strange deduction by the computer system to flag the crank sensor instead of the MAF sensor which was causing the problem. Many people would simply jump to changing the crank sensor. I wonder what code would be present if you had changed the crank sensor? If it did still set a crank sensor code after replacing it many people would be running around in a circle. It's good to see a smart technician looking at multiple aspects instead of jumping to a snap conclusion. Great video showing how a fault code is an indicator of what the computer thinks is wrong.
service info was the key. Great work Matt
great video great work.
Great job to not get distracted by the code, thanks for sharing
One quick tip….these mazda pcm are nasty on giving codes which totally are opposite to the real issue i suffered alot on these 2.2 skyactive junk its a nightmare to figure it out….great and quick diag depending on your experience..cheers
Nice diag!!. Hopefully this duralast will "dura" more than a year
Great job using service info to find the theory of operation. Not all cars use the MAF as the trigger.
Nice diagnosis. Not sure why the shop would get another aftermarket sensor that only lasted a year unless an OEM one wasn't available.
Nice find! Every time i find a shiny new bad part with no name in it, i alway think autozone.
Good job sir, the maf unit of this car is designed to house the air intake temperature sensor as well.
Love your diag process! Thank you!
Thanks for sharing!
Good job. I don't see how amateur zone stays in business. We see tons of problems with duralast parts at my shop.
So why the crankshaft position code.
Since it’s an inductive style crank sensor ( downside for that sensor is they only give signal when the engine is turning) how do you check for integrity of the cranksensor circuit? This manufacturer desided: let’s pick the maf sensor for telling us that the engine is running. And if then there is not yet a signal from the crank sensor, we should set a crank sensor code. Oh and if the engine is on ( that’s what the maf was reporting ) then the alternator should work by now, so throw the battery light on…..
the all data info was great from the start. Your diagnosis was right , and quick:)! Mazda does things a little bit different than others….
Nice one! I know I would have wasted a lot of time on that crank sensor circuit, then the remote start before checking into MAF. Nice job!
I've had a couple Toyotas do something similar. Set cam and crank circuit codes when both were perfectly fine.
Thanks for the video , time to ditch that Duralast crap lol
Do these engines use the 5V reference signal to drive the MAF and CKP output? I wonder if the 5V ref supply (or ground) was noisy or intermittently failing with high resistance…. Perhaps the 5V ref had partially shorted to ground through a bad MAF giving weird secondary symptoms?