Both fault codes refer at Tnasmission problem...
P0743 - Torque Converter Circuit ElectricalThis DTC appears when an open or shorted condition is detected in the TCC (Torque Converter Clutch) solenoid control circuit; check this as possible causes:
- fused ignition switch output circuit open
- torque converter clutch solenoid defective
- TCC solenoid circuit w/h intermittent defect
- TCCsolenoid circuit w/h observable defect
- TCC solenoid control circuit open
- TCC solenoid control circuit short to ground
- PCM defective (TCC solenoid control circuit)
You will need remove the cover/pan to inspect the harness that goes to all the
solonoids and then to inspect the valvebody and the TCC solonoid itself.
If you have a multimeter then you could ohm through the harness and
even the solonoid. I have found that most of the time this code was
produced because of the solonoid itself. But it could be the circuits to
it also. There is abig connector an top of the trans that goes into the
trans and the internal harness ispect that connector for any corrosion
or damaged pins or wires.
P0753 - Shift Solenoid A Electrical Malfunction
This is a common repair that I have replaced several of
the solenoid but it is not a cronic problem. It be the wire going to the
solenoid shorted so make sure that is check before the transmission is
tilted down and the side cover removed. 90% it is just the solenoid; the
solenoid is located in the side pan of the tranmission. It would mean
lowering the cradle(what the engine and transmission sit on) and
lowering the transmission down about one to two feet. Check this like a possible cause:
- 1-2 shift solenoid control circuit is open or shorted to ground
- 1-2 shift solenoid control circuit is shorted to voltage
- 1-2 shift solenoid has failed
- PCM has failed
You will need to remove the transmission pan and its the
solenoid with the red and light green wires going to it. Let us know if
you have questions contact us here.
Hope this helps and just keep in mind that your feedback is important
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Jose.
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