P0720 OSS issue
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Mountain Pass
Joined: Feb 2003
Posts: 207
Likes: 2
From: parkersburg usa
P0720 OSS issue
I have a 1998 e series 7.3 powerstroke rv. I’ve got the p0720 code for the oss sensor. I replaced the sensor (on rear of trans) I’ve checked wiring from sensor to engine bay with no obvious issues. Does anyone have a pin out for ecm connector so I can try to run new wire from ecm to sensor? Trans works fine just throws the code and od light flashes. Is there any way to check the power feed to the sensor? Is it like a 5v reference or something like that?
thanks
thanks
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,739
Likes: 2,669
From: SE Florida
There is no power feed to the sensor. The sensor generates a square wave when the output shaft turns.
When you checked the wires, what was the ohm reading for each wire to the sensor from the PCM? Was either wire shorted to ground or power? If you don't have the answers to these questions you didn't check the wiring. You may have looked at the wiring, but that doesn't do anything for you.
When you checked the wires, what was the ohm reading for each wire to the sensor from the PCM? Was either wire shorted to ground or power? If you don't have the answers to these questions you didn't check the wiring. You may have looked at the wiring, but that doesn't do anything for you.
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Mountain Pass
Joined: Feb 2003
Posts: 207
Likes: 2
From: parkersburg usa
I visually checked wiring up
too the doghouse. I need the pin out to check resistance from pigtail to pcm. Does anyone know what pins are the OSS signal and signal return?
too the doghouse. I need the pin out to check resistance from pigtail to pcm. Does anyone know what pins are the OSS signal and signal return?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,739
Likes: 2,669
From: SE Florida
I just used this magic called Google and found a wiring diagram for a 1998 E Series. It shows the OSS is pin 84 and the signal return is pin 91.
https://portal-diagnostov.com/en/202...ring-diagrams/
https://portal-diagnostov.com/en/202...ring-diagrams/
Fleet Mechanic
Joined: Jan 2023
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Many of us stress about paying $15 for this type of product but at the same time we subscribe to more expensive internet services like Amazon, streaming TV and music etc. It's ok to spend a little money to save a lot (most of us know this already and this is why we are here).
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