4r100 Codes PCM Issue?
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4r100 Codes PCM Issue?
Working on a 2002 F-350 7.3 with 4r100. Right after start up the PCM throws the following codes:
P0750
P0755
P0743
P1754
P1747
These are all related to an "open circuit" or "short circuit" for the solenoids in the transmission. I cannot seem to resolve this problem. So far I have:
Replaced solenoid pack. No change.
Tested continuity in all wires on solenoid pack connector all the way to PCM. Confirmed as good.
Tested resistance on all wires on solenoid pack connector all the way to PCM. Confirmed as good.
Confirmed transmission has a good ground.
I don't know what to check next. These codes would occur randomly when driving at first and sometimes even go way during the same drive. Now it happens immediately on start up. I'm thinking something is wrong with the PCM? I don't want to jump to this conclusion if I missed something.
I'm not sure what to do next. Any help would be great.
Thanks
Chad
P0750
P0755
P0743
P1754
P1747
These are all related to an "open circuit" or "short circuit" for the solenoids in the transmission. I cannot seem to resolve this problem. So far I have:
Replaced solenoid pack. No change.
Tested continuity in all wires on solenoid pack connector all the way to PCM. Confirmed as good.
Tested resistance on all wires on solenoid pack connector all the way to PCM. Confirmed as good.
Confirmed transmission has a good ground.
I don't know what to check next. These codes would occur randomly when driving at first and sometimes even go way during the same drive. Now it happens immediately on start up. I'm thinking something is wrong with the PCM? I don't want to jump to this conclusion if I missed something.
I'm not sure what to do next. Any help would be great.
Thanks
Chad
Butt-Head
Joined: Apr 2004
Posts: 9,457
Likes: 2,938
From: Reed Point, MT
You didn't mention checking the power feed to those solenoids as they all share one common 12v source. Positive voltage should be present in run and start at the solenoid body. The PCM supplies the ground path for each solenoid independently depending on operating conditions. Those codes set when 12v is not detected on the individual circuits when the PCM is powered-up and the solenoids are not commanded on.
Red with a yellow tracer on pins 1 and 12 at the transmission connector. Power from 20 amp fuse #2.23 fed from PCM power relay (which should be good since the vehicle runs).
Red with a yellow tracer on pins 1 and 12 at the transmission connector. Power from 20 amp fuse #2.23 fed from PCM power relay (which should be good since the vehicle runs).
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You didn't mention checking the power feed to those solenoids as they all share one common 12v source. Positive voltage should be present in run and start at the solenoid body. The PCM supplies the ground path for each solenoid independently depending on operating conditions. Those codes set when 12v is not detected on the individual circuits when the PCM is powered-up and the solenoids are not commanded on.
Red with a yellow tracer on pins 1 and 12 at the transmission connector. Power from 20 amp fuse #2.23 fed from PCM power relay (which should be good since the vehicle runs).
Red with a yellow tracer on pins 1 and 12 at the transmission connector. Power from 20 amp fuse #2.23 fed from PCM power relay (which should be good since the vehicle runs).
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,739
Likes: 2,669
From: SE Florida
That's not related in any way. It can't possibly be the problem. And it's called the Transmission Range Sensor (TRS.)
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