O2 Sensor Problems Persist
New User
Joined: May 2006
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Eye opener
This thread was an eye opener for me. I think I may have the same problem. Luckily, I haven't changed the O2 sensors yet. The voltages on the connectors seem to check out fine, along with the resistance of the heater circuit on the sensors. Only difference is I'm getting P0174 instead of 171. 174 says that bank 2 is running too lean. I'm also geting P0136(malfuntion in the electrical circuit for Sensor 2 bank1) in addition to 135, 141, and 155. My truck is also a 96 with the Straight 6 engine.
I'm not sure which fuse is for the heater circuit either. I remember looking in the owner's manual a while back, and didn't see anything about a fuse for any sensors or heater circuits. (I've been putting this fix off for a while...)
Back to some more troubleshooting before I condem the ECU. I'll post my results. If anyone has any tips other than have been posted here, feel free to chime in
.
I'm not sure which fuse is for the heater circuit either. I remember looking in the owner's manual a while back, and didn't see anything about a fuse for any sensors or heater circuits. (I've been putting this fix off for a while...)
Back to some more troubleshooting before I condem the ECU. I'll post my results. If anyone has any tips other than have been posted here, feel free to chime in
.
Cargo Master
Joined: Oct 2004
Posts: 2,148
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From: Seneca, SC
to my knowledge the owner's manual dosen't list stuff like trouble codes. That's stuff you gotta get a full truck manual for or at least a haynes. The laundry list o' codes you're getting makes for a lotta diagnosis. Good luck.
New User
Joined: May 2006
Posts: 9
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Troubleshooting
Well, I got hold of a Ford service manual, and got time to look at this, FINALLY. Here's the deal: I followed the manual and all of my sensors check out fine. I got to the point where it says to connect the break out box. Only problem is that I don't have one 
. The dealer by me pretty much said they didnt' want to look at my truck because it is over 10 years old.
I'm going to look at pulling the connector off the PCM and check the pins that way, as per the manual. Does anyone have any suggestions on doing this? Do you think I will be successful in doing it this way, or is it a waste of time?
I wonder if I could find a loaner break out box somewhere... Are there places that rent these out?
I like my truck, I don't want to get rid of it. '96 with only 63K and a 5 speed manual
. The wing windows rule too!
Thanks!
. The dealer by me pretty much said they didnt' want to look at my truck because it is over 10 years old.I'm going to look at pulling the connector off the PCM and check the pins that way, as per the manual. Does anyone have any suggestions on doing this? Do you think I will be successful in doing it this way, or is it a waste of time?
I wonder if I could find a loaner break out box somewhere... Are there places that rent these out?
I like my truck, I don't want to get rid of it. '96 with only 63K and a 5 speed manual
. The wing windows rule too!Thanks!
New User
Joined: May 2006
Posts: 9
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Fixed
Well, I should have looked at the PCM/PCM connector in more detail yesterday. There is no need for a breakout box!!!!
I continued to follow the Ford manual diagnostics, and I got to the step that says "replace the PCM". I bought a new one at Napa today and put it in. Light is off
. Road test in a little while.
Applehead, thanks for the hint about taking the wheel skirt off to access the PCM. It worked great. I actually didn't take it all the way off. I took enough screws out to be able to bend it back out of the way.
I continued to follow the Ford manual diagnostics, and I got to the step that says "replace the PCM". I bought a new one at Napa today and put it in. Light is off
. Road test in a little while.Applehead, thanks for the hint about taking the wheel skirt off to access the PCM. It worked great. I actually didn't take it all the way off. I took enough screws out to be able to bend it back out of the way.
Last edited by bigcountry350; Jun 2, 2007 at 04:36 PM.
Senior User
Joined: Nov 2005
Posts: 151
Likes: 2
I am going through the same exact thing BUT the ECM did not fix the light.
I'm ready to torch the truck!
Had a smoke test done, no leaks.
New o2 twice, new ACT, MAP, Water temp Sensor, New ECM.
Cleaned the IAC and the EGR.
Please do me a favor and steal my truck....no wait I took full coverage off.
Can a bad ICM do it?
I can tell it's been a problem for awhile, the truck had one range cooler plugs in it.
The truck is sold as soon as I fix it so I'm a bit desperate.
It doesn't run rich at all and the plugs are quite bright.
KO
I'm ready to torch the truck!
Had a smoke test done, no leaks.
New o2 twice, new ACT, MAP, Water temp Sensor, New ECM.
Cleaned the IAC and the EGR.
Please do me a favor and steal my truck....no wait I took full coverage off.
Can a bad ICM do it?
I can tell it's been a problem for awhile, the truck had one range cooler plugs in it.
The truck is sold as soon as I fix it so I'm a bit desperate.
It doesn't run rich at all and the plugs are quite bright.
KO
Last edited by kiohio1985; Nov 1, 2007 at 07:21 PM.
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