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david sikkenga Posted on Mar 03, 2018
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Checking crankshaft sensor 2001 blazer 4wd - Cars & Trucks

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jack layton

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  • Cars & Trucks Master 5,569 Answers
  • Posted on Mar 03, 2018
jack layton
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Usually if I suspect the crank sensor, I just replace it. It should be located by the harmonic balancer, on the end of crankshaft. As you can see three wire connector, ref voltage--ground--signal. The green wire is ref voltage, 12 volts. The purple wire should be ground. The yellow wire is signal, the signal should switch, dc pulse.
checking crankshaft sensor 2001 blazer 4wd - crank sensor-4ot1myht0fdm211olyezkz1d-5-0.jpg

Vernon Taylor

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  • Cars & Trucks Master 7,446 Answers
  • Posted on Mar 03, 2018
 Vernon Taylor
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Two main types of sensor - Hall effect or inductive. A good idea of whether the inductive type is bad can be formed using an ohmmeter. The Hall effect type is more complex.

By far the best method of checking is to use an oscilloscope though some diagnostic software can provide the verification of a signal even at cranking speed.

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5 Related Answers

Philip Armitage

  • 437 Answers
  • Posted on Sep 11, 2009

SOURCE: 2001 Chevrolet Blazer:

these 4x4 units are controlled by a module in passenger kick panel. water leaks onto module and after time is corrodes the connectors and the unit. check for this and repair where needed

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Efstathios Govas

  • 285 Answers
  • Posted on Sep 23, 2009

SOURCE: crankshaft sensor located 98 jeep grnd cher 4wd 6cy

it is located at the back of the engine on top of the transmission bell housing,the plug runs over to the passenger side of the engine bay and it comes out from behind the engine,you can actually get your hand on the sensor itself from under the hood on the drivers side,and i believe its a 13mm bolt holding it in,the new sensor will have a sticker on the end of it...leave it there,it is used for correct spacing between the sensor and the flywheel,hope this helps

Testimonial: "Everything was just like you said but as a not atleast for my jeep it is an 11mm not 13mm. Works great so far (keep fingers crossed) "

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Marvin

  • 85242 Answers
  • Posted on Jun 05, 2010

SOURCE: crankshaft sensor location on 2001 oldsmobile

. Its above the starter going into the side of the block. (front side of the engine) Disconnect the battery. Remove the starter. Remove the wIre CONNECTOR plug to the sensor. The sensor has 1 bolt holding it in. Remove the bolt, you may have to wiggle the sensor at the base a bit as you pull it out. Replace, and make sure it is pushed in all of the way. Replace the bolt, wire plug, starter, reconnect the battery.

Anonymous

  • 1 Answer
  • Posted on Jun 26, 2010

SOURCE: Where is the crankshaft sensor located on a 2001

have you found out how to fix this problem? mine is doing the same thing now. we replaced the crankshaft sensor but now it is saying i have a misfire

Anonymous

  • 4399 Answers
  • Posted on May 03, 2011

SOURCE: I have a 2001 Chevy

Thanks for choosing FixYa and welcome. Check your timing belt/chain first. Check all of your fuses also, just in case. The camshaft is a possible cause to your issue. The signal may not be getting back to the computer. In order to find the issue, you will need to get a voltage meter to test the parts of the ignition system. Make sure the spark is a good spark, as well as the fuel pressure.

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2001 Chevy Blazer, 2wd works, 4wd low works, 4wd high does not work.

It sounds like you are experiencing an issue with the 4WD system on your 2001 Chevrolet Blazer. Here are a few things you can try to troubleshoot the problem:
  1. Check the fluid levels in the transfer case and the front and rear differentials. Low fluid levels can cause issues with the 4WD system.
  2. Make sure that the front and rear driveshafts are properly connected and not damaged.
  3. Inspect the 4WD control module and wiring for any damage or lose connections.
  4. Check for any error codes using a diagnostic scan tool. This may help to identify any issues with the 4WD system.
  5. If the issue persists, it may be necessary to have the 4WD system inspected and repaired by a professional mechanic.
I hope this helps! If you have any additional questions or need further assistance, don't hesitate to ask
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Front of the engine behind the harmonic balancer at the crankshaft.
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There isn't a sensor on these. There is a regulator, if that what your looking for? it is inside the plenum attached to the injector control. Under the big plug near the rear of the engine.
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It is not likely that the timing has "jumped". Jumping time is more likely with timing belts on OHC engines. Your engine should have a timing chain with steel gears. You may have a faulty cam sensor, crankshaft sensor (usually when crank sensors go out you have no spark or anything), or module problem. Purchase a "noid" light to check your injector pulse or contact a local store that may alllow you to use their scanner.
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There's been a lot of problems with the 4wd systems on the blazers of that vintage. The only sure way to track down the cause is to have the system scanned. Some of the most commom causes are: the switch in the dash, - the control module, - the transfer case . There are other issues if it has auto 4wd as the ABS system is tied into that system to activate it when the sensors sense wheel slippage. If your blazer has the auto 4wd funtion and has a ABS light on, it could be in the ABS system.
IF you could get it back into 2wd, you could pull the fuse to the 4wd to dis-able untill you have a chance to have it scanned.
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Where is the crankshaft sensor located on a 2001 chevy blazer 4.3L v6. The check engine code was crankshaft sensor and cyl #2 misfire.

If you have a distrubutor it is located in the side.Books says you have to turn the crank with a breaker bar to align the slots.Well hope this helps,and good lock.
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I just spent a bundle on this, the ABS/brake light is the ABS control module dealer says the module alone in1K plus just for the module , the 4WD not working is a 4WD sensor in the dash sucking me dry for another 200.00 bucks, Good luck and hope this helps.
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