Crankshaft sensor malfunction

I had a mechanic put in a new timing chain in a 2.4 l and the next day the crankshaft sensor malfunctioned supposedly, order new one installed it myself and that one supposedly malfunctioned according to the OBD2 tester that was done on each crankshaft sensor what could be possible causes?

 

Did you install an OEM SENSOR?

 

it could be just a coincidence or the tech could have damaged the timing sprocket while removing the timing chain crankshsft sprocket or a socket fell in and damaged the sensor or ??? very tough to tell not being there.

See the very last plate for a picture of what we are talking about.

http://markofshame.com/fsm/03_Tacoma/Repair_Manual/03tacoma/em2rzfe3/timcha/comp.pdf

 

This is what I put in it:


Resistance in Ohms 1.65k - 2.75k
Features:

• Validation tested from -40 to 300 degrees Fahrenheit
• Life-cycle tested to meet or exceed OE specifications
• OE-style brackets, hold downs, hardware, spacers and weather-tight connectors
• O-rings and seals included, if required

Benefits:

• Proper alignment, positioning and spacing for faster, easier installation
• Sensor is properly sealed to prevent leaks, which reduces comebacks
• Sealed connections to prevent environmental corrosion and performance issues
• Direct OE replacement
• Performs as well as or better than OE
• Longer component life

 

For some reason every time I click on that link it just takes me right back to your post also it was a timing chain kit that had sprockets new in it

 

Honestly unless there's something obviously wrong with the sensor or the wiring you gonna have to find someone with a scope to check it or you could guess all day at it. Since you had timing chains done I'd closely inspect the wiring in that area for rubbed or pinched spots.

 

I'm going to put it in the shop tomorrow on a diagnostic machine but that's a good idea thanks

 

Good luck, hopefully they know what to look for.

 

Well it's not the same mechanic I used to put in the timing chain, it's Goodyear and I asked them if they had a diagnostic machine with oscilloscope and I would have put the timing chain in myself but it's been to that gum hot and my shop is an open air shop, the sky is a ceiling it only leaks when it rains

 

Yea I just had to throw that in there because I see so much $ wasted by shops and individuals on the parts shotgun on a simple problem because they didn't know how to test, were too lazy to test, or don't have the right equipment to test. The video in the first link of my sig has 2 perfect examples of the parts cannon getting out of hand although the 2nd one would have thrown even some pros for a loop.
The other problem with throwing parts is new problems sometimes get "built in" due to substandard parts especially in today's parts market.

 

To me the guy that put the timing chain in should have made sure everything was right but when you're a quart and a half low on oil one of the spark plug wires isn't even connected and when I took the alternator off to install the new crankshaft sensor the bolts on the bottom of the alternator not even tight and he didn't like the idea that I confronted him about not relearning the crankshaft sensor and I did look at the wiring while I was working on it I didn't see any pinched but I didn't really look at all of it and I got an F-150 I'm trying to get on the road and need a new engine in it and I've got an F-350 with about 10 to 12 thousand miles on a remanufactured engine and everything else $6,500 worth of parts my labor I need to find another truck to put it in

 

Yea unfortunately I see stuff like that come in all too often at the shop I work at, I can almost always tell where someone has been when I look at a vehicle (screws missing/wrong, wiring harnesses not where they belong, broken stuff, etc) because no one seems to take pride in their work anymore.

Ouch, I hope it all works out good for you.

 

What part of Texas are you in? I'm over here in Springtown and yes you're exactly right people don't take pride in their work anymore

 

I'm quite a ways south in the Yorktown area.

 

Oh yeah I noticed the guy didn't put the Fender bolts back in the front when he took the front grill off Goodyear said it was because my rotor button burnt up due to arcing and they also said that that would show a crankshaft sensor malfunctioning on a OBD2 tester so I'm wondering if that's true and why would my rotor button be arcing

 

Not surprising unfortunately. I had a Chevy diesel in yesterday that had a motor put in at another local shop, they brought it to us because the A/C wasn't working. It looked like one of the biggest hack-job engine replacements I've ever seen, I ended up finding 2 grounds that were left loose as the cause of no A/C.

I suppose it's plausible although that rotor doesn't look terrible. There's always going to be arcing on the end of the rotor that goes around the outside, that's how it distributes spark but the there shouldn't be any at the center unless the button in the distributor cap is burnt.
What year is your truck and what code number were you getting?

 

1996 toyota tacoma dxl. Code was PO335 and it read out crankshaft sensor malfunction both times on each, the one that was originally in the engine and the replacement I installed they also said that the arcing caused the corner of the rotor button to disintegrate

 

There's a tech note about low battery voltage while cranking setting that code.
I'm assuming it it runs and it's not setting a p1335 so it could be an airgap problem as well, is there any shims on the sensor?

 

it runs when I picked it up from the first garage that put the timing chain in it was running and then the next day the check engine light came on put an OBD tester on it and it came up with being the crankshaft sensor clear the codes even disconnected the battery ordered a new crankshaft sensor installed it drove it well over a hundred miles next day check engine light came on again OBD tester said it was crankshaft sensor took it to Goodyear ask them to put it on their diagnostic machine and they told me that it was the rotor button they said my rotor button was burnt up I asked them if that would cause a crankshaft sensor code to come up and they said yes they went ahead and put a new rotor button in it ask them if they could go ahead and do an inspection on it they said I had to drive it about 80 miles before they could so I drove about a hundred and fifty miles round trip haven't had the check engine light come on yet passed inspection at Quick Lube when is cold about 2 crank's it'll fire up after been running for a while and driving it's about 4 cranks before it fires up there were no shims on the crankshaft sensor the new one or the old one

 

many times even with experienced mechanics

at final assembly its not unusual to be 1 tooth off

on the timing chain

i would check there first