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Originally Posted by Natedawg
okay as you know i've been working for toyota as an entry level mechanic for about 2 days after leaving jiffy lube where the pay sucks and didn't teach me nothing. i want to become a toyota technician so i need alot of help guys..
1.customer states that the car will just start and shut off.. check engine light is crankshaft position sensor.. okay we replaced it.. it goes in block and into crankshaft.. now what does that sensor does.. please explain it good because i searched it up online and google and it confused me... |
As the name would imply, it tells the engine computer the position of the crankshaft, like is it at TDC or not. This is what the computer bases the timing on. Having a bad CPS is the same as having your distributor loose and rotating randomly.
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Originally Posted by Natedawg
2. same thing what about cam shaft sensor...
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What you said. Same thing. The sensor tells the computer where the camshaft is in it's revolution. Both of those sensors are basically magnetic switches that are opened and closed by the proximity of either some chunk of the shaft or a special piece of metal.
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Originally Posted by Natedawg
3. okay now customer states that the car would start and stall out in the cold morning.. dude went ahead and said its the iacv valve.. how did he know that. how did he know it wasn't anything else.... is there a way u can test it.. how does the iacv valve work i know its located in throttle body.. theres like 3 coolant hoses going to it and like 3-4 vaccumm line how does that all work...
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IACV stands for Idle Air Control Valve. So it's just IACV, or IAC valve.
What it does is control the opening of a small hole in the throttle body when the butterfly is closed. This way it acts like a small automatic throttle and controls the idle speed of the engine. It is reasonable to assume that a problem with idle would be caused by the Idle Control. You can test the valve coil for continuity and possibly for operation. I would hope this guy did test it rather than just replace it. A mechanic that would randomly replace crap without testing on my car would annoy me.
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Originally Posted by Natedawg
4. charcoal canister how does that exactly workagain i looked it up and i don't seem to really understand it...
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Charcoal absorbs stuff. In this case, gas fumes.
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Originally Posted by Natedawg
5. okay on a camry we got 2 sensors one is AFR sensor and 02 sensor... how exactly does those 2 work and how are they different from each other...
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One senses the amout of air going into the intake, one senses oxygen content of exhaust. They work on different principles and screw into opposite ends of the engine
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Originally Posted by Natedawg
6. none of the car have disturbutor beside the old school ones like old camry.. how does the new model work i see like 4 big squared things on the valve cover and has wires running to it.. pleas explain how it all work.. DIS ignition i believe...
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Magic. Yeah, that's it, it works on magic.
Realistically, there are books written on the subject, and pretty fat ones. Depends on the level of detail you want. If you want to get into the real nuts and bolts of it, you need to understand electronics and programming.
Basically, you've got a magic black box. Box takes in signals from sensors, and spits out signals to the ignition coils. (That's the square things onthe cover). It does this according to some program. So, this is just like your computer you used to post this that takes in signals from keyborad and mouse, does something to them according to a set of instructions, and spits out signals to a screen and a printer.
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Originally Posted by Natedawg
7. also what is the idle pulley for.. like what does it actually does..
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Well, if it's idle, it can't be doing much of anything, can it?
You probably mean "idler". If that's what you meant, you gotta be more specific. Serpentine belt idler? Timing belt idler?
Idler pulleys are generally pulleys that do not drive anything. They are there to route the belt.
Now, can you guess where I work?
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