nofire crank position sensor help http://www.jeepforum.com/ubb/brickwall.gif - JeepForum.com

 
LinkBack Thread Tools
post #1 of 4 Old 08-20-2009, 07:07 PM Thread Starter
pastorjakes
Registered User
 
Join Date: Aug 2009
Location: usa
Posts: 3
nofire crank position sensor help http://www.jeepforum.com/ubb/brickwall.gif

should both the supply wire and also the signal wire have 5vdc at all time then the ign switch on, engine off? should the signal wire while cranking remain at 5vdc? why is it not measuring 0vdc 0-5-0-5-0-5vdc while cranking? hum i rated the sensor bad do you?
can someone help me. i have a 1996 jeep gc 4.0 HO. i have no fire at the coil.pull the code p0320 i check the ckps. i check the volts to the sensor with fluke dvom and i had black led on middle wire (b) and red on the end (c)signal wire. ign switch on and had 5 vdc move the red to (a)5vdc supply (wt/bk color) and it also read 5 vdc with switch on. so then i crank the engine while volt meter red led placed on (c) signal wire (rd/lg color) and the black led on the middle ground wire (b) bk/lb color). the volt meter just measures 5 vdc and not 0-5-0vdc... so does this mean that the sensor is not send a signal to the pcm so the pcm can tell the coil to fire. i also check for high resistance and conudity on the wires harness at the sensor to the pcm all tests good. can some one please tell me what i miss. please help.. thanks in advance


Last edited by pastorjakes; 08-21-2009 at 10:45 AM.
pastorjakes is offline  
Sponsored Links
Advertisement
 
post #2 of 4 Old 08-20-2009, 08:51 PM Thread Starter
pastorjakes
Registered User
 
Join Date: Aug 2009
Location: usa
Posts: 3
P0320
Trouble Code Conditions:

Engine cranking, vacuum signals present; and the PCM detected from 3-8 CMP Sensor signals without detecting a CKP Sensor signal.

Possible Causes:

*

CKP Sensor signal circuit is open or grounded
*

CKP Sensor VREF circuit is open or grounded
*

Tone wheel or flex plate damage or erratic CKP Sensor signals
*

CKP Sensor is damaged or has failed
*

PCM has failed
pastorjakes is offline  
post #3 of 4 Old 08-20-2009, 08:51 PM Thread Starter
pastorjakes
Registered User
 
Join Date: Aug 2009
Location: usa
Posts: 3
can somebody please help me?

Last edited by pastorjakes; 08-21-2009 at 06:10 AM.
pastorjakes is offline  
post #4 of 4 Old 09-26-2009, 05:36 AM
jeep795
Registered User
1992 YJ Wrangler 
 
Join Date: Jun 2005
Location: warren, ma
Posts: 1,052
maybe i'm a little bit late with a response, but it might be too quick of a change for your meter to pick up. Usually a job like that is for an oscilloscope.
jeep795 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Crank Position Sensor dirt rider ZJ Grand Cherokee Forum 6 04-29-2012 06:12 PM
where is the crank position sensor? 5.2L jeepheller98 ZJ Grand Cherokee Forum 8 04-28-2009 07:48 PM
Crank Position Sensor? BliZZard911 ZJ Grand Cherokee Forum 8 01-12-2008 06:56 AM
Crank Position Sensor YJinMN ZJ Grand Cherokee Forum 18 07-02-2007 08:32 AM
Crank position sensor Othoni ZJ Grand Cherokee Forum 10 05-19-2007 10:14 PM

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 On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome