Mazda Repair Questions? Ask Mechanics for Answers ASAP
P0753 sets when the transmission control module (TCM) determines there is malfunction with the Shift Solenoid A circuit. It sets the code after it has detected voltage stuck at either 0 or B+ after engine starts.
This is mostly caused by a bad solenoid, but, since there is no fuse protecting the circuit, often times the failure of the solenoid can cause the driver in the TCM to fail as well, in which case it too would have to be replaced. This can be confirmed with a WDS or equivalent scan tool.
There is also a chance that the issue is being caused by an open or shorted circuit due to a bad connection or wiring, so that would be the first thing to check.
The wiring means the harness connecting the TCM to the solenoids.
The TCM activates the solenoids by providing a ground path; problem is, Mazda did not put fuses in those circuits, so if a solenoid goes bad and draws too much current, it burns the switching driver inside the TCM as well.
Actually, I never had to replace a harness so I don't know of any source other than the dealer - most times we were able to repair the wires or, if called for, replace the TCM. Is your harness so bad that it can't be repaired?
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