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Old 07-11-2007, 03:06 PM   #1
Stang0005
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Default PO340 code

My check engine light came on and i ran a tuner and the code i got back was PO340. Can anyone tell me what the code is and how i could fix it? Thanks.
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Old 07-11-2007, 03:31 PM   #2
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Default RE: PO340 code

P0340 Camshaft Position Sensor circuit fault. google is your friend! someone else can chime in for a diagnostic
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Old 07-11-2007, 03:35 PM   #3
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Default RE: PO340 code

CMP camshaft position sensor....Malfunction...
Note:most common cause is alternator Noise...Also = RFI-Radio interference and or Crankshaft position problems should be considered...
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Old 07-11-2007, 03:36 PM   #4
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Default RE: PO340 code

Quote:
ORIGINAL: 99shadowGT

P0340 Camshaft Position Sensor circuit fault. google is your friend! someone else can chime in for a diagnostic
+1 thats what i got when i searched it up. Click the image to open in full size. is your friend
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Old 07-11-2007, 04:29 PM   #5
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Default RE: PO340 code

what kind of symptoms are you having? if a new cps doesn't fix it, i'm 95% sure a new/rebuilt alternator would...
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Old 07-11-2007, 05:07 PM   #6
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Default RE: PO340 code

http://www.mustangforums.com/m_3521141/tm.htm

Please read my post on what I hope will become a sticky. This should help you with this code.
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Old 07-11-2007, 07:25 PM   #7
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Default RE: PO340 code

Read your post....But,,,,the alternator does not send ampreage or anything else to the Cam Sensor....Its due to ELECTRICAL INTERFERENCE....Radio interferance(RFI) can cause this also.The cam sensor is simply a magnetic pickup(same as the Crank sensor)...which produces a square wave pattern(on,duration or time,off) for cam signal (and crank)to the ecm....I've replaced more alternators than CMP sensors for these symtoms.Hence "usually the alternator"...just trying to clarify....
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Old 07-11-2007, 09:46 PM   #8
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Default RE: PO340 code

Yea, I had that problem with my Stang, turns out it was actually the Cam Position Sensor.... WOW

[sm=icon_beat.gif]
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Old 07-12-2007, 07:43 AM   #9
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Default RE: PO340 code

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ORIGINAL: Pest007

Yea, I had that problem with my Stang, turns out it was actually the Cam Position Sensor.... WOW

[sm=icon_beat.gif]
Yes is usually cheaper to replace the CMP first for someone who doesnt know how to check it out(and that may very well fix it)...and if that doesnt fix it....next comes the alternator.....I've relaced a ****z load of cam sensors on the power strokes...but less than 1/2 dozen in x(15 years) on the fordcars..
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Old 07-12-2007, 10:01 AM   #10
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Default RE: PO340 code

Just fixed mine a couple weeks ago.

Replaced the cam shaft sensor and blewthe 2ndone out after driving a couple of miles. Had to do more investigating and found that my alternator was bad which can short out the cam shaft sensor since it is one of the most sensitive sensors in the car. After putting a brand new (not rebuilt) alternator and a 3rd cam shaft sensor problem is fixed.

Good luck
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Old 07-12-2007, 10:01 AM
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