Trans Range Sensor OBD Codes PO705 and PO708 - F150online Forums



Trans Range Sensor OBD Codes PO705 and PO708

Reply
 
 
  #1  
Old 10-05-2004, 09:57 AM
Junior Member
Thread Starter
 
Join Date: Oct 2004
Posts: 14
Trans Range Sensor OBD Codes PO705 and PO708

The local AutoZone read the OBD codes on my 97 4X4 5.4 as DTC PO705, Trans Range Sensor Circuit Malfunction, (PRDNL Input), and PO708, Trans Range Sensor Circuit High Output.

About 10% of the time this tranny shifts extremely hard into 1 and 2, less hard into 3, sorta seems like it's in Lo range. A fluid change made the problem disappear for a few days.

Where do I start to solve this problem ? Is a part needed that is accessible without going inside the tranny, and can a guy of average ability do it without disaster ?

Thanks for any suggestions. This rascal has 155k on the clock by the way. Fluid was changed 3 times in it's life.

Pyzon
Reply With Quote
  #2  
Old 10-05-2004, 01:30 PM
Senior Member
 
Join Date: Jul 2004
Location: cincinnati
Posts: 1,380
The range sensor is the sensor on the side of the transmission where the linkage connects.
Do you have any linkage problems in the column?
Alan
Reply With Quote
  #3  
Old 10-05-2004, 05:22 PM
Junior Member
Thread Starter
 
Join Date: Oct 2004
Posts: 14
No, dirtyd0g, nothing that has been the least bit obvious. Any suggestions ?

Thanks.
Reply With Quote
  #4  
Old 10-05-2004, 09:44 PM
Senior Member
 
Join Date: Jul 2004
Location: cincinnati
Posts: 1,380
A shop with a scanner can test the functions of the MLPS (range sensor) but for the expense it would be cheaper to just replace it than to test it.
It needs to be properly aligned upon installation. I have a tool for it but you can do it by eye . It has marks on it that you line up with the transmission in neutral.
Hope this helps.
Alan
Reply With Quote
  #5  
Old 10-06-2004, 04:41 PM
Junior Member
Thread Starter
 
Join Date: Oct 2004
Posts: 14
Thanks, dirtyd0g,

Just so I understand clearly, the range sensor can be replaced and the only real installation issue is the proper alignment of the sensor with the selector in the neutral position ?

Sounds too easy, but I'll give it a go. The alignment tool you refer to is probably a Ford dealership service tool that independent shops would not likely have, correct ?

thanks a ton.
Reply With Quote
  #6  
Old 10-06-2004, 07:04 PM
Senior Member
 
Join Date: Jul 2004
Location: cincinnati
Posts: 1,380
The range sensor is easy to replace all you need is a 15mm wrench and a 8 mm wrench.
Aligning it is pretty simple too once you bolt it on leave the 2 8mm bolts loose and put the trans in neutral. You will see the alignment marks.
Alan
Reply With Quote
  #7  
Old 10-06-2004, 08:48 PM
Junior Member
Thread Starter
 
Join Date: Oct 2004
Posts: 14
OK, sounds easy enough.

I suppose that part is only available at a dealer ? I think I'll give NAPA a try first.

Thanks for the help.

Pyzon
Reply With Quote
  #8  
Old 10-07-2004, 12:09 AM
Senior Member
 
Join Date: Jul 2004
Location: cincinnati
Posts: 1,380
Napa might have it. I personally am a firm believer in OE electronics.
Alan
Reply With Quote
  #9  
Old 10-11-2004, 06:11 PM
Junior Member
Thread Starter
 
Join Date: Oct 2004
Posts: 14
Dirtyd0g-

Thanks for the good advice and installation tips. $48 part and 15 minute install make this problem history !!

Keep up the good work, friend.

Pyzon
Reply With Quote
  #10  
Old 10-11-2004, 06:59 PM
Senior Member
 
Join Date: Jul 2004
Location: cincinnati
Posts: 1,380
Your welcome. Glad you got it taken care of.
Alan
Reply With Quote
 
 
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Trucknoob
2004 - 2008 F-150
12
11-03-2015 01:12 PM
Thegrizzly
2004 - 2008 F-150
0
08-07-2015 10:18 AM
mikehawk
2004 - 2008 F-150
2
07-28-2015 01:05 AM
Nunyanunya
2004 - 2008 F-150
1
07-27-2015 02:12 PM


Thread Tools
Search this Thread

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 On
Refbacks are Off



All times are GMT -4. The time now is 08:43 AM.