P0340: Camshaft vs Distributor Cap - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 11-11-2010, 10:14 AM   #1
Newb
 
Join Date: Apr 2010
Posts: 10
P0340: Camshaft vs Distributor Cap

What are the relations between these two components? It sounds as if the internet is telling me that distributor caps were phased out when camshafts were brought in.

I have 1999 Jeep Wrangler 6 cyl: I'm 99% certain that I'm looking at a distributor cap. Doesn't that do what the camshaft sensor does? Do I just replace the camshaft with P0340? Does the 1999 Jeep Wrangler even have a camshaft sensor?

EvanCarroll is offline   Quote Quick Reply
Old 11-11-2010, 11:59 AM   #2
Jeeper
 
pokey's Avatar
 
Join Date: Feb 2010
Location: backroads of the Mojave
Posts: 1,106
Your '99 does have a distributor. It was the last year, then in 2000 they used the coil rail on plugs which uses a camshaft position sensor to synchronize firing order. I don't know what P0340 code is, but there's a list here somewhere.

__________________
__________________________________________
. . . . picking the lines with my twenty-nines . . . .
__________________________________________

'99 sport 4.0 5 speed, top-of-the-line floormats
pokey is offline   Quote Quick Reply
Old 11-11-2010, 12:56 PM   #3
Jeeper
 
neverfastenough1's Avatar
 
Join Date: Nov 2010
Location: Savannah, Ga
Posts: 925
P0340 is the code for a bad camshaft sensor. You can look up troubleshooting procedures or just take a chance that it is truely bad and get a new one. It usually is bad though.
neverfastenough1 is offline   Quote Quick Reply
Old 11-11-2010, 01:31 PM   #4
Newb
 
Join Date: Apr 2010
Posts: 10
Not getting it

If I have a distributor cap, do I also have a camshaft sensor? Or, does my error code which means "Bad Camshaft Sensor" indicate the problem is in the distributor?
EvanCarroll is offline   Quote Quick Reply
Old 11-11-2010, 01:33 PM   #5
Newb
 
Join Date: Apr 2010
Posts: 10
P0340 means literally "Camshaft Position Sensor Circuit Malfunction", does that indicate Distributor Cap on a 1999?
EvanCarroll is offline   Quote Quick Reply
Old 11-11-2010, 01:52 PM   #6
Jeeper
 
pokey's Avatar
 
Join Date: Feb 2010
Location: backroads of the Mojave
Posts: 1,106
The camshaft position sensor is inside your distributor (under the cap). I think it's about a $50 part and easily replaced. Is your engine running rough ?
__________________
__________________________________________
. . . . picking the lines with my twenty-nines . . . .
__________________________________________

'99 sport 4.0 5 speed, top-of-the-line floormats
pokey is offline   Quote Quick Reply
Old 11-11-2010, 03:30 PM   #7
Newb
 
Join Date: Apr 2010
Posts: 10
No, it isn't running rough -- It isn't running at all. It cranks but doesn't start. I think you're right. I didn't know the camshaft was under the distributor cap. I guess I just order one and take off the cap, and I should see it fairly easily?
EvanCarroll is offline   Quote Quick Reply
Old 11-11-2010, 03:44 PM   #8
Jeeper
 
pokey's Avatar
 
Join Date: Feb 2010
Location: backroads of the Mojave
Posts: 1,106
Yeah, no start is a symptom. I think it's fairly straightforward to replace. I've never done it, try a search here. Or better yet get a factory service manual for your '99. The dealer where you buy the part should also be able to tell you how to replace it. Good luck.
__________________
__________________________________________
. . . . picking the lines with my twenty-nines . . . .
__________________________________________

'99 sport 4.0 5 speed, top-of-the-line floormats
pokey is offline   Quote Quick Reply
Old 11-11-2010, 03:44 PM   #9
Newb
 
Join Date: Apr 2010
Posts: 10
Awesome, your advice is really appreciated.
EvanCarroll is offline   Quote Quick Reply
Old 11-11-2010, 04:22 PM   #10
Jeeper
 
neverfastenough1's Avatar
 
Join Date: Nov 2010
Location: Savannah, Ga
Posts: 925
Didn't see the year of your Jeep before, but I don't think the 99 has a Camshaft sensor. I think you would get the same code for a crankshaft position sensor which I believe the 99 has. I would suggest grabbing a repair manual for your Jeep and looking it up. Isn't the distributor gear driven by the camshaft? Wouldn't need a camshaft position sensor if it is.
neverfastenough1 is offline   Quote Quick Reply
Old 11-11-2010, 04:49 PM   #11
Newb
 
Join Date: Apr 2010
Posts: 10
That's what I thought, but could P0340 mean that the distributor cap is bad? I believe the crankshaft has a totally different set of codes.
EvanCarroll is offline   Quote Quick Reply
Old 11-11-2010, 05:05 PM   #12
Newb
 
Join Date: Apr 2010
Posts: 10
Wow, well that settles it. I found the manual online:

1999 Jeep TJ Wrangler Service Manual - 08. Electrical Systems

I'll look up P0340 tonight, but that book, shows the camshaft sensor in the distributor cap. Pg 8D-13 et seq.
EvanCarroll is offline   Quote Quick Reply
Old 11-11-2010, 07:47 PM   #13
Jeeper
 
neverfastenough1's Avatar
 
Join Date: Nov 2010
Location: Savannah, Ga
Posts: 925
Quote:
Originally Posted by EvanCarroll View Post
Wow, well that settles it. I found the manual online:

1999 Jeep TJ Wrangler Service Manual - 08. Electrical Systems

I'll look up P0340 tonight, but that book, shows the camshaft sensor in the distributor cap. Pg 8D-13 et seq.
Good deal. Learn something new every day. Hope its a easy fix for ya.
neverfastenough1 is offline   Quote Quick Reply
Old 11-12-2010, 10:06 AM   #14
Newb
 
Join Date: Apr 2010
Posts: 10
Done!

It was an easy fix -- easier than changing the oil.

* Open Distributor Cap
* Take out sensor
* Blow it off, wipe it off, blow it off
* Out it back.

All went great. I took some videos of it, I'll put them on youtube later on if they turned ok. There are a lot of error messages on this board and others relating to this.
EvanCarroll is offline   Quote Quick Reply
Old 12-01-2010, 09:07 PM   #15
Show Me Your 8008135!

WF Supporting Member
 
s3nt3nc3d's Avatar
 
Join Date: Oct 2009
Location: Piqua, OH
Posts: 3,643
Send a message via AIM to s3nt3nc3d
Quote:
Originally Posted by ddunk80 View Post
This indicates that a problem was detected in the camshaft position sensor circuit. Since it says circuit, that means the problem could lie in any part of the circuit - the sensor itself, the wiring, or the PCM. Don't just replace the CPS and think that will definitely fix it.
Unless it starts after you replace it...

However, I did receive this code recently...wasted $50 on a new OEM sensor.

Turns out the problem was the starter (solenoid is malfunctioning). The P0340 was just a result of the starter not cranking the engine enough for it to start...causing the PCM to not be able to read the CPS signal.
__________________
"We don't build great brakes because we think you don't know how to drive, we build them for the guy on the road in front of you that doesn't." - Black Magic Brakes
s3nt3nc3d is offline   Quote Quick Reply
Old 06-05-2013, 09:04 PM   #16
Jeeper
 
Join Date: Jun 2013
Location: Barre, Vermont
Posts: 41
Quote:
Originally Posted by s3nt3nc3d View Post
Unless it starts after you replace it...

However, I did receive this code recently...wasted $50 on a new OEM sensor.

Turns out the problem was the starter (solenoid is malfunctioning). The P0340 was just a result of the starter not cranking the engine enough for it to start...causing the PCM to not be able to read the CPS signal.
I just picked up a 97 Wrangler 4.0L 5 speed tonight, and on the ride home it misfired and threw the P0340 code. So after limping it home. I cleared the code took it for a spin and bam another misfire and the P0340 code. It makes a whirling noise while in motion but not in idling I am thinking that's a wheel bearing. As when i cleared the first time it had a second wheel speed sensor code. I am wondering the best way to make sure its the Sensor before I just replace it.

Timelord83 is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Long Cranks / Camshaft? ejmct TJ General Discussion Forum 10 02-04-2011 10:15 AM
P0340 Camshaft Position Sensor s3nt3nc3d TJ Tech Forum 5 10-23-2010 12:00 AM
What Oil to Use with camshaft issue steitsma TJ Tech Forum 3 10-22-2010 02:39 PM
Camshaft PS error and ingnition errors nabates TJ Tech Forum 6 08-28-2009 11:24 PM
Camshaft gears? Triple88a TJ Tech Forum 0 02-01-2007 06:17 PM



» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 10:05 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC