nofire crank position sensor help http://www.jeepforum.com/ubb/brickwall.gif - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > nofire crank position sensor help http://www.jeepforum.com/ubb/brickwall.gif

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineRubicon Express Suspensions from CCOR 706-207-4140Smittybilt Hard Tops @ Oconee Off-Road! 706-534-9955

Reply
Unread 08-20-2009, 07:07 PM   #1
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   Reply With Quote
Unread 08-20-2009, 08:51 PM   #2
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   Reply With Quote
Unread 08-20-2009, 08:51 PM   #3
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   Reply With Quote
Unread 09-26-2009, 05:36 AM   #4
jeep795
Registered User
1992 YJ Wrangler 
 
Join Date: Jun 2005
Location: warren, ma
Posts: 1,023
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.
__________________
"my jeep is pretty much my wife. it gets most of my time, and it loves when i spend money on it."
jeep795 is offline   Reply With Quote
Reply
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.