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ODBII Error - "P0743 Torque Converter Clutch Circuit Electrical"
I am getting an ODBII Error - "P0743 Torque Converter Clutch Circuit
Electrical" on my 1998 Ford Explorer XLT AWD. The "O/D Off" light flashes in the dash as well as the Check Engine light. I have a code reader and it gives the message above. I have tried to read up on what the error might be, but there is limited information. Many people say that they have had $1200-$3000 transmission jobs to get it fixed, while others say to unhook the battery for 15 minutes to clear the codes and keep on going. Others have stated that this code is not critical to the life of the transmission. I have had the problem for about two weeks now and the light comes on and the transmission has problems (not major) shifting when accelerating from 1st or 2nd into the next higher gear (2nd or 3rd respectively). Then it has a problem downshifting into first when coming to a stop - kinda a "ka-thunk" noise. If I use the code checker to clear the codes the transmission shifts perfectly. then after a random amount of time (2 minutes to 2 hours) of driving, the lights come back on. If clearing the codes makes everything shift properly, what could it be? I have read a few other websites that talk about a "transmission solonoid for coupling and un-coupling of the torque converter". Anyone know what this really means and is it something that can be changed by an above average home-mechanic. I have worked a lot with antique cars and many other things, - just not with AWD transmissions. Thanks for any information. Happy Holidays! Don C. |
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#2
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I'm assuming you have the 5R55E transmission.... Depending on the failure,
P0743 "may" be benign and simply cost you extra at the pumps..... or it could have the TCC not releasing when it needs to - continued driving may be just getting the thing closer to catastrophic failure and a bigger hit to the wallet (let alone the inconvenience and extra cost of any "unscheduled" breakdown - perhaps coming at a time when one can least afford the finacial aspect or when one is running very late for something very important). When the lamps illuminate, the TCM will go into a preprogrammed failure strategy... hence the rough feel when the lights are lit, smoothing out when you clear the codes. Continuing to clear the codes and drive may be the automotive equivalent of watching that big, leaking goober on an important body part get bigger without consulting a physician. These things never, ever "heal themselves" and usually only get worse with the passage of time and miles..... In case you're wondering.... this code indicates that the PCM has not seen a voltage drop across the TCC solenoid (search "voltage divider circuits" for an understanding of the logic)..... This could indicate either an open in the wiring, an open in the solenoid or an intermittent short to ground in the solenoid control circuit. "Don-Don" > wrote in message ... >I am getting an ODBII Error - "P0743 Torque Converter Clutch Circuit > Electrical" on my 1998 Ford Explorer XLT AWD. The "O/D Off" light > flashes in the dash as well as the Check Engine light. I have a code > reader and it gives the message above. I have tried to read up on > what the error might be, but there is limited information. Many > people say that they have had $1200-$3000 transmission jobs to get it > fixed, while others say to unhook the battery for 15 minutes to clear > the codes and keep on going. Others have stated that this code is not > critical to the life of the transmission. I have had the problem for > about two weeks now and the light comes on and the transmission has > problems (not major) shifting when accelerating from 1st or 2nd into > the next higher gear (2nd or 3rd respectively). Then it has a problem > downshifting into first when coming to a stop - kinda a "ka-thunk" > noise. If I use the code checker to clear the codes the transmission > shifts perfectly. then after a random amount of time (2 minutes to 2 > hours) of driving, the lights come back on. If clearing the codes > makes everything shift properly, what could it be? I have read a > few other websites that talk about a "transmission solonoid for > coupling and un-coupling of the torque converter". Anyone know what > this really means and is it something that can be changed by an above > average home-mechanic. I have worked a lot with antique cars and many > other things, - just not with AWD transmissions. Thanks for any > information. > > Happy Holidays! > > Don C. |
#3
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Great information. I am going to do a few searches tomorrow on the
Voltage Divider Circuits. It sounds like from what you say that the problem "could" be a poor connection somewhere. Wouldn't that be nice. I only wish it was warmer weather her in the DC area and I would take a longer look at it. Do you (or anyone) have any short cuts to where the wiring connections might be. I don't know if the wiring would be down under the vehicle near the transmission or near one of the transfer cases - that would be a big help to start. On Fri, 24 Dec 2004 06:25:51 GMT, "Jim Warman" > wrote: >I'm assuming you have the 5R55E transmission.... Depending on the failure, >P0743 "may" be benign and simply cost you extra at the pumps..... or it >could have the TCC not releasing when it needs to - continued driving may be >just getting the thing closer to catastrophic failure and a bigger hit to >the wallet (let alone the inconvenience and extra cost of any "unscheduled" >breakdown - perhaps coming at a time when one can least afford the finacial >aspect or when one is running very late for something very important). > >When the lamps illuminate, the TCM will go into a preprogrammed failure >strategy... hence the rough feel when the lights are lit, smoothing out when >you clear the codes. Continuing to clear the codes and drive may be the >automotive equivalent of watching that big, leaking goober on an important >body part get bigger without consulting a physician. These things never, >ever "heal themselves" and usually only get worse with the passage of time >and miles..... > >In case you're wondering.... this code indicates that the PCM has not seen a >voltage drop across the TCC solenoid (search "voltage divider circuits" for >an understanding of the logic)..... This could indicate either an open in >the wiring, an open in the solenoid or an intermittent short to ground in >the solenoid control circuit. > > >"Don-Don" > wrote in message .. . >>I am getting an ODBII Error - "P0743 Torque Converter Clutch Circuit >> Electrical" on my 1998 Ford Explorer XLT AWD. The "O/D Off" light >> flashes in the dash as well as the Check Engine light. I have a code >> reader and it gives the message above. I have tried to read up on >> what the error might be, but there is limited information. Many >> people say that they have had $1200-$3000 transmission jobs to get it >> fixed, while others say to unhook the battery for 15 minutes to clear >> the codes and keep on going. Others have stated that this code is not >> critical to the life of the transmission. I have had the problem for >> about two weeks now and the light comes on and the transmission has >> problems (not major) shifting when accelerating from 1st or 2nd into >> the next higher gear (2nd or 3rd respectively). Then it has a problem >> downshifting into first when coming to a stop - kinda a "ka-thunk" >> noise. If I use the code checker to clear the codes the transmission >> shifts perfectly. then after a random amount of time (2 minutes to 2 >> hours) of driving, the lights come back on. If clearing the codes >> makes everything shift properly, what could it be? I have read a >> few other websites that talk about a "transmission solonoid for >> coupling and un-coupling of the torque converter". Anyone know what >> this really means and is it something that can be changed by an above >> average home-mechanic. I have worked a lot with antique cars and many >> other things, - just not with AWD transmissions. Thanks for any >> information. >> >> Happy Holidays! >> >> Don C. > |
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