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2nd Gen Dakota 1997 - 2004 Dakota's

What Does A Camshaft Position Sensor Do?

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Old 02-02-2011, 07:46 PM
steve25537 steve25537 is offline
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Default What Does A Camshaft Position Sensor Do?

I have a 98 Dodge Dakota 3.9 V-6 and it's not firing nor does the Auto Shutdown Replay kick in. I have tried other replays still not working.

My question is does the Camshaft Position Sensor have anything to do with the Auto Shutdown Relay?
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Old 02-02-2011, 09:03 PM
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The camshaft position sensor and the crankshaft position sensor both help the pcm establish the rotational position and speed of the engine. The camshaft position sensor helps the pcm determine when to inject fuel to each cylinder and the ignition timing.

If there is no signal from either the Crank PS or the Cam PS it will shut down the ASD relay.

Have you checked for codes?
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Old 02-02-2011, 09:05 PM
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OK whats going on, I called 2 Auto Part Stores and both told me that my 98 Dodge Dakota with a 3.9L V6 SFI engine didn't have a Camshaft Position Sensor, but I took it out today and cleaned it just to see if it would make a difference, which it didn't. It sits under the Dist Cap with a 3 wire plug in.

Can someone please help...
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Old 02-02-2011, 09:07 PM
22DODGE22 22DODGE22 is offline
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The crank shaft position sensor senses where the crank shaft position is. When you first turn on the key, the ASD relay come on for a couple seconds, if it doesn't then the problem is not the crank sensor or any other sensor.
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Old 02-02-2011, 09:13 PM
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Thank you for your reply, so what would make the relay not to come on and work? I have checked fuses, changed relays and nothing works.


Thanks
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Old 02-02-2011, 09:17 PM
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Thanks 00DakDan for your reply, so if the Crank and/or the Cam Senors are bad then the Auto Shutdown Relay won't work and will not produce spark "Firing"?
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Old 02-02-2011, 09:50 PM
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Like 22Dodge22 said, the ASD relay should come on for a few seconds. If the pcm doesn't receive a signal from either sensor it will shut down the ASD.

Can you pull any codes?
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Old 02-02-2011, 09:58 PM
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cam position sensor is listed in parts stores as "pickup coil" or "secondary pickup coil". its inside the distributor cap, down at the bottom. looks like this on a V8

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Old 02-02-2011, 10:29 PM
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Thanks dhvaughan for the info, I found it on Autozones website, but had another question.

The Pickup Coil "Camshaft Pos Sensor on the website said it was for a 1998 Dodge Truck Dakota 2WD 3.9L MFI 6cyl but when I ran the VIN to check what motor was in it it said 1998 Dodge Truck Dakota 2WD 3.9L SFI 6cyl.

So my question is, are there any difference in the MFI and the SFI or will the part still work?

Thanks
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Old 02-03-2011, 01:56 AM
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I will move this to the 2nd Generation Dakota Sub-Forum.
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Old 02-03-2011, 02:09 AM
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I would not buy anything electrical from AutoZone.. Actually I hate AutoZone with a passion..
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Old 02-03-2011, 02:39 AM
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Quote:
Originally Posted by jondakotaguy View Post
I would not buy anything electrical from AutoZone.. Actually I hate AutoZone with a passion..
I've had great results with autozone, to each his own I guess. I wont go anywhere else but there when I need a part.
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Old 02-03-2011, 09:45 AM
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Quote:
Originally Posted by dodgeramguy85 View Post
I've had great results with autozone, to each his own I guess. I wont go anywhere else but there when I need a part.
I hear ya.. at least our experience we've had nothing but problems with their parts..

But thats just us..
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Old 02-03-2011, 09:53 PM
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steve, i think the SFI vs MFI is a misprint and not important, or its possibly the same part for either. either way - any modern parts store computer application is going to give you the right part, provided they guy pulls the right part number.

i think our trucks are all SFI, because the injectors are right at the intake valve, and they fire under pcm control timed to the cam... unlike an older MFI which squirts a bunch of gas at the top of the intake just like a carb would.

http://answers.yahoo.com/question/in...0130853AAL2gsZ

i buy parts from autozone all the time. they're almost always fine, except that autozone has gotten too expensive. autozone used to be cheaper than advance, but now they are consistently higher. compare prices with advance, you might save $5.
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Old 02-03-2011, 09:58 PM
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back to your original question, i'm not following what's wrong. if you have no fire at the plugs, it could be coil, pcm, crank position sensor, or cam position sensor. typically the cam position sensor is more for controlling timing, not killing the spark. lack of signal from crank position sensor will cause the ASD to shut down the fuel pump and the power to the coil.

if you're not finding what you need, come over to 2nd gen ram and browse the "no start" threads. the problems of the v6 and v8 are identical, so all the info from the ram applies to the dakota and durango. they use all the same crap. especially check the posts from mckenna. they are very... ummm, detailed.


you're original question - what does the sensor do? it tells the pcm the exact position of the distributor shaft, so that it can time the fuel injector exactly to the spark. the pcm somehow factors in all the timing advance features electronically, instead of through old fashioned mechanical and/or vacuum controls.
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Last edited by dhvaughan; 02-03-2011 at 10:04 PM..
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Old 02-03-2011, 09:58 PM
 
 
 
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