PO340 code - MustangForums.com



4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Reply
 
 
 
Thread Tools Search this Thread
Old 07-11-2007, 03:06 PM   #1
Stang0005
1st Gear Member
Thread Starter
 
Join Date: Jul 2006
Location:
Posts: 136
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.
Stang0005 is offline   Reply With Quote
Old 07-11-2007, 03:31 PM   #2
99shadowGT
2nd Gear Member
 
Join Date: Nov 2006
Location: Central Jersey
Posts: 394
Default RE: PO340 code

P0340 Camshaft Position Sensor circuit fault. google is your friend! someone else can chime in for a diagnostic
99shadowGT is offline   Reply With Quote
Old 07-11-2007, 03:35 PM   #3
8banger
4th Gear Member
 
8banger's Avatar
 
Join Date: Oct 2006
Location: Kentucky
Posts: 1,460
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...
8banger is offline   Reply With Quote
Old 07-11-2007, 03:36 PM   #4
jEEd
I ♥ Acer
 
Join Date: Jan 2007
Location: Laguna Hills, CA
Posts: 2,214
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. is your friend
jEEd is offline   Reply With Quote
Old 07-11-2007, 04:29 PM   #5
Brute03
5th Gear Member
 
Brute03's Avatar
 
Join Date: Jan 2006
Posts: 2,504
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...
Brute03 is offline   Reply With Quote
Old 07-11-2007, 05:07 PM   #6
str8wick3d
3rd Gear Member
 
Join Date: May 2006
Location:
Posts: 811
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.
str8wick3d is offline   Reply With Quote
Old 07-11-2007, 07:25 PM   #7
8banger
4th Gear Member
 
8banger's Avatar
 
Join Date: Oct 2006
Location: Kentucky
Posts: 1,460
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....
8banger is offline   Reply With Quote
Old 07-11-2007, 09:46 PM   #8
Pest007
2nd Gear Member
 
Join Date: May 2007
Location:
Posts: 338
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]
Pest007 is offline   Reply With Quote
Old 07-12-2007, 07:43 AM   #9
8banger
4th Gear Member
 
8banger's Avatar
 
Join Date: Oct 2006
Location: Kentucky
Posts: 1,460
Default RE: PO340 code

Quote:
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..
8banger is offline   Reply With Quote
Old 07-12-2007, 10:01 AM   #10
BBZracing
1st Gear Member
 
Join Date: Jul 2005
Location: NJ
Posts: 102
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
BBZracing is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
what are the odds - Service Engine Soon light lincolnshibuya V6 (1994-2004) Mustangs 9 12-08-2015 05:37 PM
Bad cylinder? Dathan V6 (1994-2004) Mustangs 4 10-05-2015 06:52 AM
I should've known better ChampInSD 5.0L GT S550 Tech 13 10-02-2015 05:55 AM
Please help! 10 Check engine codes mrtrodonet V6 (1994-2004) Mustangs 1 09-29-2015 12:13 PM
Clear codes on '94 sn95 BOB ROME 5.0L (1979-1995) Mustang 2 09-28-2015 12:10 PM


Tags
04, 2003, 340, 94, alternator, cam, camshaft, code, gt, interference, mustang, po340, radio, sensor, shaft

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 02:54 PM.