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Old 07-07-2005, 08:27 PM   #1
binkers
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Default Replacing Engine speed sensor

I took my car to autozone to get my SES code (car was not wanting to start). It came back p0727 engine speed sensor. Talking to a service guy on the phone at Saturn he said it would be the sensor by the crank shaft pulley. I had Autozone order me one and am going to try to replace it myself. Does anyone have any advice? the plug that I see near the crankshaft has one wire and the sensor looks like it goes into a tube. Any help would be greatly appreciated.

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Old 07-07-2005, 09:02 PM   #2
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Default Re: Replacing Engine speed sensor

Year, model and engine?
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Old 07-08-2005, 01:52 AM   #3
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Default Re: Replacing Engine speed sensor

Sorry about that, I'm stupid sometimes. It's a 2001 L300.
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Old 07-08-2005, 02:50 AM   #4
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Default Re: Replacing Engine speed sensor

A 727 is a trans code. If the car runs the crank sensor is obviously good. but the TCM (transmission control module) gets engine speed from the ECM (engine control module) to know what is up. All communication is done over a twisted pair of CAN wires. the Einstein at autozone should have pulled a TCM requested light code too.
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Old 07-08-2005, 07:36 AM   #5
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Default Re: Replacing Engine speed sensor

Sorry about that. He did pull a transmission code also, but said it was most likely the first one. I don't remember what the trans code was. It was something like 1708 or 1728. So what do you recommend that I do?
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Old 07-08-2005, 10:32 AM   #6
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Default Re: Replacing Engine speed sensor

Any P07-- code is a trans code. The code the guy at autozone thinks is a trans code is the code from the ECM telling you to check the TCM which is where your P0727 was. Everytime i have seen that happen on a 3.0 car it usually means the ECM is about to hit the bucket
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Old 07-08-2005, 07:41 PM   #7
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Default Re: Replacing Engine speed sensor

From the service manual for P0727.


This code does not indicate a problem with the TCM. It does indicate the ECM is not sending engine speed to the TCM.
Determine the problem or look for trouble code(s) in the ECM.


We will need the other codes in the system. Engine and the trans.

Also the sensor on the front of the engine by the crank shaft pulley is the crankshaft position sensor.
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Old 07-09-2005, 08:02 AM   #8
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Default Re: Replacing Engine speed sensor

Crank sensor on a 3.0 is by the oil filter.
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Old 07-09-2005, 11:48 AM   #9
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Default Re: Replacing Engine speed sensor

Quote:
Originally Posted by bigc791
Crank sensor on a 3.0 is by the oil filter.
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My apologies, bigc791 is correct. It would seem that I was brain farting.
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Old 01-05-2006, 07:08 PM   #10
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Default Re: Replacing Engine speed sensor

My apology since this is has become old, but I need to know where is the crankshaft sensor located at on the 2001 L100 2.2L? Are is there one on the 2.2L?
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Old 01-26-2006, 03:12 AM   #11
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Default Re: Replacing Engine speed sensor

This post is sort of an "update" to specifically this thread and this one.

I have a 2001 L300 V6 with a little over 100k miles. I recently experienced a no start condition when the engine was hot. An engine code scan revealed exactly the same two codes: P0727 and P1780. Searching through the forums yielded several people that have experienced the same problem and some guesses as to source (bad ECM, Crank Position sensor, etc), but I was disappointed to find no update or confirmation of the actual problem from anyone who actually got it fixed. After doing some diagnostics myself when the engine was hot, I conclusively found the source of the problem - a bad Crank Position (CKP) Sensor.

It is easily tested. On the V6, the sensor itself is to the right of the oil filter and has a wiring harness running up the front of the engine to a connector on the top right (driver side) of the engine. I disconnected it and used a multimeter (ohmmeter) to test the resistance when it was hot (and failing to start). I got a resistance of over 10meg. As the engine cooled (over the course of less than 2 minutes) the resistance dropped very quickly all the way down to about 1.2k, a factor of about a 1000x. At that point I reconnected it, and naturally the engine started. I replaced it and everything is good.

Hopefully this information will be helpful to somebody else down the road. I know I could have used it. :-)

PS: 1stSaturnOwner, there IS a CKP sensor on the 2.2L. However, I am not familiar enough with that engine to tell you it's location. Maybe somebody else can?
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Old 01-26-2006, 03:34 AM   #12
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Default Re: Replacing Engine speed sensor

Also, the P1780 code is not (as reported in some posts) a park/neutral safety switch (that is a Ford code I believe). For a Saturn it is officially a "Torque Reduction Signal Circuit Malfunction". SSICarMan has a good explanation of what this implies (above).

See also:
http://service.gm.com/gmspo/mode6/pd...2001trans3.pdf

I hope this helps.
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Old 01-31-2006, 02:56 AM   #13
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Default Re: Replacing Engine speed sensor

any p code that starts with a 0 is the same for every manufature. if it starts with a 1 its manufature specific.
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Old 01-31-2006, 09:28 PM   #14
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Default Re: Replacing Engine speed sensor

Thanks, casaturn! Hopefully, ssicarman could help me out!

Ssicarman, is speed sensor/crankshaft sensor similar in location to the V6?
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Old 02-01-2006, 12:23 AM   #15
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Default Re: Replacing Engine speed sensor

Quote:
Originally Posted by 1stSaturnowner
Thanks, casaturn! Hopefully, ssicarman could help me out!

Ssicarman, is speed sensor/crankshaft sensor similar in location to the V6?

Check the link for a diagram of the sensor location.

http://www.saturnfans.com/photos/sho.../size/big/cat/

Basicly it is over the starter. Starter needs to come out to replace it.
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Old 02-01-2006, 06:34 PM   #16
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Default Re: Replacing Engine speed sensor

Quote:
Originally Posted by ssicarman
Check the link for a diagram of the sensor location.

http://www.saturnfans.com/photos/sho.../size/big/cat/

Basicly it is over the starter. Starter needs to come out to replace it.
Thank you, ssicarman!!

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