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Discussion Starter #1
I have an 05 f-250 automatic with several codes thrown 715,717,718,730 Just bought the autoengenutiy with the ford pkg and could use some help figuring out what to look at for a diagnosis. any help would be appreciated .
 

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Former Ford Trans Engr.
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All of those codes are caused by either a bad Turbine Speed Sensor (TSS) or a damaged wire between the PCM and the TSS. It's one of those two.
 

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I replaced both tss &oss and for a 20 mile test drive it shifted perfect. parked it for the night and in the morning it didn't make it to the first stop sign , no more 715 - 718 codes but the 730 returned. it's shifting erratic , starts in 2nd sometimes downshifts to First back to second. Sometimes it'll go straight from 2nd to 4th which I have never seen fourth before today. It'll reach 6th but then bounces out of six pretty steadily won't hold. Not really sure where to go from here I have the AE with the Ford package really not sure what to look at to finish the diagnosis
 

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Former Ford Trans Engr.
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Not really sure where to go from here I have the AE with the Ford package really not sure what to look at to finish the diagnosis
I think where to go is right here:
All of those codes are caused by either a bad Turbine Speed Sensor (TSS) or a damaged wire between the PCM and the TSS. It's one of those two.
You've replaced the TSS (and the OSS, but I don't know why) and it didn't fix it. Next, you need to diagnose what's wrong with the wiring between the TSS and the PCM.
 

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Discussion Starter #5
Whats the correct procedure for checking the wiring between the PCM and TSS sensor ? Is it best to pull the harness Or ? I did find the PIDs for the input & output shaft on the AE and monitored for a bit , looks ok there . Thanks for the INFO !!
 

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Former Ford Trans Engr.
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Unplug the harness at the PCM and the TSS. I suppose you could also check the OSS, but since there isn't a code for it the PCM is seeing good data, so there is no problem there.

Probe the BACK of each connector. DO NOT put a probe in the end of the connector that makes the connection, that spreads the pins and creates new problems. Check the circuits for continuity, short to ground, and short to power.
 

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Discussion Starter #7
I appreciate the help !! , this is my only ride so I probably won't get to dig into that until Sunday , question ? would this wiring problem also be causing the popping in and out of 6th Gear ?
 
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