coolant temp sensor problem - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 05-02-2009
JRacer's Avatar
Member
Thread Starter
iTrader: (2)
 
Join Date: May 2008
Location: Watson, Louisiana
Posts: 1,085
coolant temp sensor problem

so i bought a replacement and installed it and the guage wouldn't move. It stays all the way cold. So some guy did some little "grounding" trick and it didn't do what he wanted it to do so i returned that one and bought a replacement. It's still reading nothing. it's getting power to the connector and out the connector. I tried spraying some wd-40 in there to help it make a connection and still nothing. I'm at a loss of what to do, and i don't want to buy a new connector because you can only get them through ford and lord knows i'll have to bring my life savings if i buy it from them.
Reply With Quote
  #2  
Old 05-03-2009
JRacer's Avatar
Member
Thread Starter
iTrader: (2)
 
Join Date: May 2008
Location: Watson, Louisiana
Posts: 1,085
any other things i should check or try?
Reply With Quote
  #3  
Old 05-03-2009
ranger02's Avatar
Member
 
Join Date: May 2009
Location: newark,de
Posts: 44
my son's 96 mustang gt had the same problem, he replaced the gauge and now it works.
Reply With Quote
  #4  
Old 05-03-2009
JRacer's Avatar
Member
Thread Starter
iTrader: (2)
 
Join Date: May 2008
Location: Watson, Louisiana
Posts: 1,085
damn, i wonder where i can find that guage and how hard it is to replace.
Reply With Quote
  #5  
Old 05-03-2009
ranger02's Avatar
Member
 
Join Date: May 2009
Location: newark,de
Posts: 44
try the dealer or a junk yard should not be to hard to replace.
Reply With Quote
  #6  
Old 05-05-2009
JRacer's Avatar
Member
Thread Starter
iTrader: (2)
 
Join Date: May 2008
Location: Watson, Louisiana
Posts: 1,085
what do you mean the guage? like is there a motor behind the dash are something? i've never dealt with the guages.
Reply With Quote
  #7  
Old 05-05-2009
RangerNDog's Avatar
Member
iTrader: (10)
 
Join Date: Aug 2008
Location: Harrisonburg, VA
Posts: 1,958
Swap in a new cluster or get another cluster and swap out the pieces and see if it works then. Look at the How-To Swap Odometer thread and you will see that the gauge cluster its self is 3 pieces.
Reply With Quote
  #8  
Old 05-06-2009
Rangerguy's Avatar
Member
 
Join Date: Feb 2008
Location: California
Posts: 1,120
Quote:
Originally Posted by RangerNDog View Post
Swap in a new cluster or get another cluster and swap out the pieces and see if it works then. Look at the How-To Swap Odometer thread and you will see that the gauge cluster its self is 3 pieces.
x2, try the guage. Theres a great sticky on removing the gauges, not so bad at all.
Reply With Quote
  #9  
Old 05-06-2009
Level I Supporter
 
Join Date: Aug 2006
Location: Durham, NC
Posts: 3,657
There are 2 sensors, one for the PCM (which has 2 wires in the conector) and one for the gauge, which has a 1 wire connector.

Which one did you change?
Reply With Quote
  #10  
Old 05-06-2009
ranger02's Avatar
Member
 
Join Date: May 2009
Location: newark,de
Posts: 44
guage cluster whatever I have 79 trans am so I am use to calling them guages.
Reply With Quote
  #11  
Old 05-06-2009
JRacer's Avatar
Member
Thread Starter
iTrader: (2)
 
Join Date: May 2008
Location: Watson, Louisiana
Posts: 1,085
Quote:
Originally Posted by Takeda View Post
There are 2 sensors, one for the PCM (which has 2 wires in the conector) and one for the gauge, which has a 1 wire connector.

Which one did you change?
i changed the 1 wire connector on mine.
Reply With Quote
  #12  
Old 05-06-2009
Level I Supporter
 
Join Date: Aug 2006
Location: Durham, NC
Posts: 3,657
Quote:
Originally Posted by JRacer View Post
i changed the 1 wire connector on mine.
You changed the right sensor.....and grounding the wire going to the sensor doesn't make the gauge peg to HOT?
Reply With Quote
  #13  
Old 05-07-2009
JRacer's Avatar
Member
Thread Starter
iTrader: (2)
 
Join Date: May 2008
Location: Watson, Louisiana
Posts: 1,085
well, some other guy did it while i watched the guage, so i'm not sure if he had a good coonection. i'll try it again this afternoon with a piece wire straight to the negative terminal on the battery and i'll go check the guage. i'll let you know how it worx.
Reply With Quote
  #14  
Old 05-07-2009
JRacer's Avatar
Member
Thread Starter
iTrader: (2)
 
Join Date: May 2008
Location: Watson, Louisiana
Posts: 1,085
well, sure enough that some bich pegged out. So what do i do now?????
Reply With Quote
  #15  
Old 05-09-2009
wydopnthrtl's Avatar
Member
iTrader: (2)
 
Join Date: Dec 2005
Location: SE, Mi
Posts: 2,342
IMO the cluster is your problem.

And btw, you can read the other temp sensor with a OBD2 tool like scanguage or autotap.

Rich
Reply With Quote
  #16  
Old 05-10-2009
JRacer's Avatar
Member
Thread Starter
iTrader: (2)
 
Join Date: May 2008
Location: Watson, Louisiana
Posts: 1,085
What's the chances of the cluster jus stopping working when i change the sensor. I changed the sensor because everytime i ran the truck it was at a different temp. It moved before why would it just stop moving now??
Reply With Quote
  #17  
Old 05-12-2009
ranger02's Avatar
Member
 
Join Date: May 2009
Location: newark,de
Posts: 44
stuff just stops working not always an anwser
Reply With Quote
  #18  
Old 05-12-2009
Member
 
Join Date: Nov 2005
Location: Elizabeth City, NC
Posts: 767
That sensor (one wire) relies on its case getting a path to ground.

When you installed a new sensor, did you teflon tape the threads by any chance?

To continue troubleshooting, simply take a piece of wire. Touch one end of the wire to the sensor case and touch the other end to the NEGATIVE battery terminal. Does the gage work? If so, you have a GROUND problem.

You already ruled out a power problem.

You could also be fixing the wrong part. This symptom could be that the thermostat isn't closing, so the coolant never gets warm enough to register on the gage. IIRC, when the gage comes off the cold peg is ~ 150 degrees. I can check again on the drive home (compare ScanGuageII to dash gage), but this could easily be a bad thermostat.


Follow up on the temp gage:

Mine reaches the first line on the gage, (just above buried at full cold) @ 143 degrees. It appears to start moving from fully cold in the low 130s.

Last edited by Earl43P; 05-13-2009 at 07:28 AM.
Reply With Quote
  #19  
Old 05-12-2009
Level I Supporter
 
Join Date: Aug 2006
Location: Durham, NC
Posts: 3,657
Quote:
Originally Posted by Earl43P View Post
That sensor (one wire) relies on its case getting a path to ground.

When you installed a new sensor, did you teflon tape the threads by any chance?

To continue troubleshooting, simply take a piece of wire. Touch one end of the wire to the sensor case and touch the other end to the NEGATIVE battery terminal. Does the gage work? If so, you have a GROUND problem.

You already ruled out a power problem.

Just measure the sensor resistance to the engine block, or the negative battery terminal, that will tell you if it getting properly grounded or not....
Reply With Quote
  #20  
Old 05-13-2009
JRacer's Avatar
Member
Thread Starter
iTrader: (2)
 
Join Date: May 2008
Location: Watson, Louisiana
Posts: 1,085
i alreaady did this. you must have missed my post. i grounded to the negative terminal and the guage pegged out. so now what do i need to check now? or does the guage work right if i leave it grounded??
Reply With Quote
  #21  
Old 05-17-2009
JRacer's Avatar
Member
Thread Starter
iTrader: (2)
 
Join Date: May 2008
Location: Watson, Louisiana
Posts: 1,085
BUMP
Reply With Quote
  #22  
Old 05-17-2009
98rangerxlt's Avatar
Member
 
Join Date: Mar 2009
Location: Bakersfield, CA
Posts: 725
CHeck your coolant mine did the same thing it was about half a quart low filled it up got all of the air out now my gauge reads fine.
Reply With Quote
  #23  
Old 05-18-2009
JRacer's Avatar
Member
Thread Starter
iTrader: (2)
 
Join Date: May 2008
Location: Watson, Louisiana
Posts: 1,085
hmmm, ok i'll give it a try
Reply With Quote
  #24  
Old 05-19-2009
98rangerxlt's Avatar
Member
 
Join Date: Mar 2009
Location: Bakersfield, CA
Posts: 725
Quote:
Originally Posted by JRacer View Post
hmmm, ok i'll give it a try
The reason being your coolant can be a little low and not flow by the sensor thus reading cold.
Reply With Quote
  #25  
Old 05-19-2009
JRacer's Avatar
Member
Thread Starter
iTrader: (2)
 
Join Date: May 2008
Location: Watson, Louisiana
Posts: 1,085
right, i understand. but i checked it and its full so another option knocked off the list
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Variable Resistor - Coolant Temp Sensor 4XFord 4.0L OHV & SOHC V6 Tech 2 01-16-2011 06:29 PM
Coolant Temp. Sensor??? lil_king_12 General Technical & Electrical 1 02-08-2010 09:58 PM
coolant temp. sensor Redbeard90 2.3L & 2.5L I4 Tech 3 11-13-2008 06:11 AM
Coolant Temp. Sensor NEED HELP ASAP!!! SkiLLzWheeLz 4.0L OHV & SOHC V6 Tech 3 03-21-2008 08:53 AM
Coolant temp sensor leak? PW01 4.0L OHV & SOHC V6 Tech 8 12-30-2007 11:06 PM


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



All times are GMT -6. The time now is 10:35 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.