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How to replace Crank Position Sensor?

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How to replace Crank Position Sensor?
Old August 11th, 2014, 03:32 PM   #1
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How to replace Crank Position Sensor?

Car was bucking and threw a P1391 code a day after I got it. The bucking was intermittent; would happen a couple times on one drive, wouldn't happen the next couple drives, would happen frequently on the next, etc. Finally, the car stalled and would not crank last weekend.

Since I have to pull the Paxton off in order to get to the Cam Position Sensor, I bought a Crank Position Sensor to give that a shot first. Does anyone know how to replace the crankshaft position sensor on an '03? According to this picture of a Gen 2 motor, it's located on the back of the engine and looks like a bitch to get to. I've searched and searched to no avail.

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Last edited by 98intrigue; August 11th, 2014 at 03:39 PM.
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Old August 11th, 2014, 05:45 PM   #2
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I'm pretty sure that's actually a Gen1 engine diagram as you can see the coolant housing sticking out the back. On the Gen2's, the housing came out the front and the alternator was set lower.
As for the location, I'm not sure off hand, I'm sure someone will chime in with that though it most likely won't be where it is on that Gen1 graph.
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Old August 11th, 2014, 05:47 PM   #3
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On an '03 it's located on the passenger side, rear/bottom side of the motor.
It reads off the face of the flywheel.
You should be able to reach it, remove and replace in about 15 minutes.
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Old August 12th, 2014, 08:43 AM   #4
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Quote:
Originally Posted by Viper4Christ
I'm pretty sure that's actually a Gen1 engine diagram as you can see the coolant housing sticking out the back. On the Gen2's, the housing came out the front and the alternator was set lower.
As for the location, I'm not sure off hand, I'm sure someone will chime in with that though it most likely won't be where it is on that Gen1 graph.
Good call. I only paid attention to the intake manifold and knew it was a pre-Gen 3 motor.

Quote:
Originally Posted by Mr. Hollywood View Post
On an '03 it's located on the passenger side,
rear/bottom side of the motor.
It reads off the face of the flywheel.
You should be able to reach it, remove and replace in about 15 minutes.
Thanks! Even easier than I thought. I'll give it a shot this week and hope I can take the car to C&C on Saturday.
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Old August 13th, 2014, 10:35 AM   #5
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Old August 15th, 2014, 08:26 AM   #6
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Well, maybe this won't be so easy. I was told that the 03 vs. 04+ crank sensors are located in different spots. The 03 is actually on the flywheel, requiring to drop the transmission. The 04+ are located on the bottom passenger side of the block.

Can anyone confirm this? My car is sitting in my garage and have no way of dropping the transmission.
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Old August 15th, 2014, 09:16 AM   #7
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Quote:
Originally Posted by 98intrigue View Post
Well, maybe this won't be so easy. I was told that the 03 vs. 04+ crank sensors are located in different spots. The 03 is actually on the flywheel, requiring to drop the transmission. The 04+ are located on the bottom passenger side of the block.

Can anyone confirm this? My car is sitting in my garage and have no way of dropping the transmission.
Wrong. The '03 and '04's read off the flywheel, and you don't have to pull the transmission. The '05 to current models have them towards the middle of the block, reading off of the crank.
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Old August 15th, 2014, 10:32 AM   #8
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Quote:
Originally Posted by Mr. Hollywood View Post
Wrong. The '03 and '04's read off the flywheel, and you don't have to pull the transmission. The '05 to current models have them towards the middle of the block, reading off of the crank.
Thank you for confirming. A friend with an '05 gave me incorrect information...it's hard to find good friends these days.
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Old August 15th, 2014, 10:41 AM   #9
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One thing to consider is what if it breaks off? Chrysler's are notorious for just snapping half while trying to remove them and then things get fun. I like to spray wd-40 or pb blaster and lightly tap on the sensor go hopefully crack the seal and let the oil penetrate. Leave it for a half hour or so then slowly try to remove it.
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Old August 15th, 2014, 11:04 AM   #10
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Quote:
Originally Posted by phunny View Post
One thing to consider is what if it breaks off? Chrysler's are notorious for just snapping half while trying to remove them and then things get fun. I like to spray wd-40 or pb blaster and lightly tap on the sensor go hopefully crack the seal and let the oil penetrate. Leave it for a half hour or so then slowly try to remove it.
Thanks for the advice...I would not have thought about that.
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Old August 15th, 2014, 11:55 AM   #11
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they come right out. this isn't a 100K mile truck....................
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Old August 15th, 2014, 12:12 PM   #12
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they come right out. this isn't a 100K mile truck....................

True!


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Old August 15th, 2014, 05:48 PM   #13
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Should be able to reach the cam sensor easily just by removing the pipe between the intercooler and the throttle body. No need to remove the entire Paxton...
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Old August 16th, 2014, 09:03 AM   #14
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Well, the sensor was easy to get to. Removing it was another story. I replaced the sensorast night, but now the car has 0 power. The key fob won't even unluck the car.

I left the battery unplugged for the past 2 weeks so it wouldn't drain power, but still hoped the battery was the culprit. I just got back from having it tested and recharged...still 0 power to the car. Going to unplug and replug the new sensor in hopes it just didn't seat right. Just another reason why I don't need to touch cars.
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Old August 16th, 2014, 09:16 AM   #15
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If there's something up with the sensor....the car might not fire up, but the car should still turn over.
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Old August 16th, 2014, 09:39 AM   #16
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Quote:
Originally Posted by Mr. Hollywood View Post
If there's something up with the sensor....the car might not fire up, but the car should still turn over.
That's what I figured, but still have no idea why it has no power. Doors won't even open. I tried opening the door manually with the key, but with the window not doing the auto adjustment at the top, the glass won't clear in order to open the door.
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Old August 16th, 2014, 10:48 AM   #17
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Ryan, I have a guy for electrical issues.
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Old August 16th, 2014, 10:55 AM   #18
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You check the main fuse?


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Old August 16th, 2014, 12:15 PM   #19
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You check the main fuse?


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All the fuses looked good, aside from the 20A ASD fuse. I replaced that, but still no luck.
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How to replace Crank Position Sensor?
Old August 16th, 2014, 12:18 PM   #20
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How to replace Crank Position Sensor?

Are you getting power to the fuse? Did your ground come undone, break etc?
Do you have a dmm?

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