Blinking OD Light
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5th Wheeling
Joined: Aug 2021
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Blinking OD Light
2001 f250 5.4 2wd
My OD light is blinking and check engine light came on (mostly when I come to a stop). P0720 code. I changed the output sensor on transmission, no change. Wiring seemed to look fine. Is there a transmission temp sensor in the 2001 (there is no gauge). Change fluid and filter? Any other ideas?
My OD light is blinking and check engine light came on (mostly when I come to a stop). P0720 code. I changed the output sensor on transmission, no change. Wiring seemed to look fine. Is there a transmission temp sensor in the 2001 (there is no gauge). Change fluid and filter? Any other ideas?
Moderator
Joined: Jul 2010
Posts: 12,055
Likes: 1,559
From: Media PA
If the OD light is blinking that means the transmission has a trouble code set, that’s separate from the PCM and engine codes and simple code scanners can’t read the trans codes. Forscan can read the trans codes, which should get you the info you need to troubleshoot it.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,731
Likes: 2,658
From: SE Florida
My idea would be to check the wiring.
Saying the wiring looks fine is totally meaningless. The wiring needs to be checked for continuity from the PCM to the sensor, and for shorts to ground and to power.
Saying the wiring looks fine is totally meaningless. The wiring needs to be checked for continuity from the PCM to the sensor, and for shorts to ground and to power.
Hotshot
Joined: Jan 2004
Posts: 19,763
Likes: 1,082
From: St Louis
Is there a transmission temp sensor in the 2001 (there is no gauge). Change fluid and filter?
Wiring seemed to look fine.
Use your scan tool to monitor the OSS signal while test driving to see if you can better characterize what the PCM is seeing. It may be noisy, erratic, or reduced amplitude which can cause the PCM to squawk about it. Once you have a better handle on the nature of the fault, you can better figure out how to address it.
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5th Wheeling
Joined: Aug 2021
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I got around to getting Forscan and a connector. Here are the codes it gives. P1000, P0325, P0503, P0720, P0722, B1869, C1145. I notice there is a lot of live data you can get while driving. I went ahead and added a few transmission items and no fault in Shift Solenoid 1 Status, Shift Solenoid 2 Status, Transmission Fluid Temperature Status, or Transmission Range Status.
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Hotshot
Joined: Jan 2004
Posts: 19,763
Likes: 1,082
From: St Louis
You should probably focus on the OSS codes (P0503, P0720, P0722) first instead of getting distracted by the other stuff. Pull up the PID for the OSS sensor and monitor it while driving (safely). If it's missing or erratic, go back to the previous recommendation to check the integrity of the OSS signal wires between the sensor and the PCM. That will require the use of a meter.
The knock sensor (P0325), airbag (B1869), and ABS (C1145) codes can wait.
The knock sensor (P0325), airbag (B1869), and ABS (C1145) codes can wait.
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5th Wheeling
Joined: Aug 2021
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I agree, just not sure where to do from here with tracking down the problem. I figure it's best to start small (wiring, sensors, etc.) before spending money on a new transmission. Anything in Forscan live data that could point me in the right direction?
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