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View Full Version : How does the code po 743 come up? From eletrical wiring ,solenoid or what


gordon49
Feb 15, 2011, 03:12 PM
This is a 1999 dodge ram ,this code comes up as soon as its cleared,I know this is a tcc but how does it read this?? eddie

CaptainRich
Feb 16, 2011, 08:08 AM
Typically, the Powertrain Control Module (PCM) runs various tests whenever the key is cycled to the ON position.
That testing can run as often as every 500 milli seconds. If a fault is detected, a diagnostic trouble code will set. If it is a Type A fault, the light will come on as soon as the fault is detected. Type B can require two trips with the same failure.
The test for your vehicle: Key on or engine running, then the PCM detected an open or short circuit condition in the TCC solenoid or its circuit.
If you've cleared it and it comes right back, that system needs fault traced using strategy based diagnostics and a high impedance multi-meter and possibly a suitable diagnostic scan tool to monitor vehicle operating parameters.

gordon49
Feb 16, 2011, 11:31 PM
You are very helpful and helped me very much. I have the genisis scanner,but I'm sure I'm not going to get a data stream for the tcc I do for all engine components... thank you for your help... eddie

CaptainRich
Feb 17, 2011, 05:55 AM
Can you verify continuity and/or not shorted on the TCC circuits?
It shares Gnd with several other circuits on the BK/LB wire (PCM C1 Pin 4)? And the TCC Control is on the OR/BK wire (PCM C2 Pin 11)?

gordon49
Feb 25, 2011, 09:09 AM
Well I checked the tcc orange and blk,ign off no grd,ign on in gear no voltage and not grd.scanner can enable the tcc but turns off as soon as enabled... where is power in to pcm and I haven't checked c1 ,connection 4 bk-lb ,I would like this to be a little easy... eddie

gordon49
Feb 25, 2011, 09:18 AM
Soleniods elect inside trans ohm out OK,I removed valve body and checked all valves except for the balls.reinstalled prob still there.scanner can enable tcc but will not stay on kicks off by itself and can't get a graf of the working on and off in gear... eddie

TxGreaseMonkey
Feb 25, 2011, 12:32 PM
It's not likely the problem is with the PCM.

gordon49
Feb 25, 2011, 01:07 PM
I can erase the code turn key on no code but as soon as it starts and run the code is there... eddie..

TxGreaseMonkey
Feb 25, 2011, 01:14 PM
That indicates there is a problem with the transmission. ATX problems are usually related to poor maintenance; i.e. not dropping and cleaning the pan, changing the filter, and refilling with the proper fluid (ATF+4) at the recommended drain interval.

A common reason for this code involves the seal on the input shaft of the ATX. The seal gets damaged when the torque converter is installed or is accidentally left out during rebuild.

gordon49
Feb 25, 2011, 02:59 PM
OK I have done my best to solve this,is there a certain wire to give this code a grd or what?? Can I fool the pcm to take this code out?? Trans actually works OK.all the work and codes on engine I've fixed.this light for the trans makes all the work seem not so good... eddie... this is my lawyers truck and he hates check lights

TxGreaseMonkey
Feb 25, 2011, 03:29 PM
I don't know how to do it.

With the light on, he'll be suspicious of all work performed. Did you change the fluid and filter for him? Was the TC input shaft seal damaged?

gordon49
Feb 26, 2011, 08:02 AM
I'm very pro.at what I do,I changed fluid,filter,cleaned all valves in valve body,adjusted,bands,reg pressure,I performed that part 1st class.the trans shop that rebuilt this tran is not impressing me at all.if I knew what the signal wire is that turns chk engine from the pcm,I would just use ecm only... eddie

gordon49
Feb 26, 2011, 08:17 AM
I checked the 2 tcc wires you mentioned not shorted and not a grd when key is on.I turned tcc on with scanner and it turns itself back off .the pcm code only comes up when engine is running not with key on... eddie

gordon49
Feb 26, 2011, 08:24 AM
I feel that a trans shop changed the tc input seal,

gordon49
Feb 26, 2011, 08:31 AM
My last resort will be to take check light out,it will then give him a prob with inspect.and force the inspect. To connect the scanner for codes