code PO125 - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 06-08-2009
Member
Thread Starter
 
Join Date: Jun 2009
Location: West Melbourne, FL
Posts: 14
code PO125

I got this code. PO125 Insufficient Coolant Temp.for closed loop fuel control.


Anyone know the fix for this.

I have 03 Edge with 3.0

Thanks in advance for any help

jeffb
Reply With Quote
  #2  
Old 06-08-2009
01BlkEdge's Avatar
Member
 
Join Date: Jun 2004
Location: Deer Park, Texas
Posts: 145
Reply With Quote
  #3  
Old 03-03-2014
Member
 
Join Date: Feb 2014
Location: Statesville, NC
Posts: 3
I also have the same engine with the same OBD code showing, I changed the ECT sensor, to no avail, the code came back after 140 miles. But the temp. gauge still shows running on the cool side, the needle just barely goes above the C even after thirty miles, but have pretty good heat. So I'm at a stand still until I try changing the thermostat.
Reply With Quote
  #4  
Old 03-03-2014
RF Veteran
iTrader: (1)
 
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,585
Yes, it means one of two things, either engine is not getting up to 200degF, or ECT sensor is not working.

ECT sensor rarely fails, not never but rarely.

If the dash board temp gauge(it uses a different sender) is not up to 1/3 to just below 1/2 mark then thermostat has probably failed open, which is how they are suppose to fail if they do.

It should take no longer than 10 minutes for temp gauge to get to above 1/3.

Another test is to start cold engine and open the hood.
Feel upper rad hose, it will be cold
Wait a few minutes and feel it again, it should still be cold, if it is warming up with the engine then thermostat is stuck open.
Reply With Quote
  #5  
Old 03-07-2014
Member
 
Join Date: Feb 2014
Location: Statesville, NC
Posts: 3
OK, so I've already replaced the ECT sensor, so I tried the cold start test, within 5 to 8 min. the heater hose was very warm to the touch, but the top rad. hose was stone cold, left ideling for appx. 8 more min. and the heater hose was hot to the touch, and had good heat inside cab, but top rad hose was barely slightly warm to the touch, I'm thinking the thermostat maybe opening early. Not sure. (?)
Reply With Quote
  #6  
Old 03-08-2014
Member
 
Join Date: Feb 2014
Location: Statesville, NC
Posts: 3
quick update; the temp gauge works fine, I tested by grounding the red/white wire and turning the key to on and the temp gauge pegged out at the upper limit.
Reply With Quote
  #7  
Old 03-09-2014
RF Veteran
iTrader: (1)
 
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,585
It reads like t-stat is working as it should
Heater hose should warm up with the engine.
Upper rad hose should not.

Upper rad hose should only start warming up IF coolant behind t-stat gets above 190degF, on cold days that may not happen, and even then t-stat may only open slightly, cold coolant coming in from lower rad will cause t-stat to close again.
So t-stat will open and close to maintain the minimum 190degF for proper engine operation temp.

Upper rad hose just reflects this opening and closing.


There are 2 ECT sensors, well one sensor and one sender.
The sender is for the dash board temp gauge, it has 1 wire, and that's the one you tested.

You said you changed the ECT sensor, this is the 2 wire device that looks similar to the sender.
The ECT sensor is only used by the computer, and this is what computer uses to "see" coolant temp.
And this is what would set your code if it's wiring or the sensor itself had a problem.
The computer sends this sensor 5 volts DC, the sensor is a variable resistor so sends a lower voltage back to computer, this lower voltage "tells" the computer the temp of the sensor/coolant.

Last edited by RonD; 03-09-2014 at 03:01 PM.
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
code 327 now....help? Jeremy102579 General Technical & Electrical 0 11-08-2008 01:21 AM
Interior Trim Code for 2006... DviousDave Interior Semi-Tech 6 10-16-2008 02:13 PM
code p0174 (CEL) PickupMan92 4.0L OHV & SOHC V6 Tech 7 03-30-2005 02:20 PM
Free Palm OBD-II code reader software from me n3elz General Technical & Electrical 7 01-21-2005 12:10 PM
FREE OBD-II code reading/data logging for PALM n3elz General Technical & Electrical 3 10-22-2004 07:06 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 08:53 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.