Code P0740 - Torque Convertor Clutch Circuit Failure. My 2001 Jeep Grand Cherokee Limited has CEL on, code is P0740. Dealership wants to replace front pump, torque convertor, and possibly transmission. Is there any other fix that would proceed this?
First I want you disconnect the battery and Change filters and good oil transmission .and let me know .
will do just purchased the vehicle and will do all those things you mentioned
ok, think like a TCM AND WIN, the TCM commands tcc lock, if the the tail shaft rpm fails to drop, then tcc is bad,or the transmission slips, its just very stuupiid micro, and cant really know,, which ? this is hints ,not found in most poor books, check the tcc wire for lockup command first. is just a 12vdc wire,no encrypted serial data, or other magic,
a pro gets in car with full scan tool, in full scan and driver drives car hard flogs it hard,up hills attempting to feel slip or see Tcm vomits codes. ahhhhhhhhh and does the 2 stall tests and the LINE PRESSURE TEST 1st, do you have the FSM, if workikng any slush pump ,you need the FSM, open it and read the on car tests, the are easy, you do or they do, there is no other ways.
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Find a local ASE shop and pay for full diagnosis.
answer, assumes real scan tool used an no other DTCs !!!
fresh AFT and filter? dah? hope happens. levels
do the FSM stall tests fail,? do the FSM stated, line pressure test pass? dah 1,2,3 factors. (basics all every one)
did they check he voltages in to the tranny first to the tcc lockup
solenoid.
a true tech does that;.
even better (no trans p/n ) stated by you,lets do the path end to end. there is a test at each point. (almost)
TCM brain decides to engage TTC (Lock main clutch)
some cars (diff.trans) have a relay here, and it energizes,
and send more powerful 12vdc to trans.
12vdc arrives,at trans port, (not if corroded)
and then arrives at the tcc solenoid, we check this too ,pan off
we then check ohms of this soleniod, 10 to 35 is my guess, and if
infinity bingo, new solenoid time.
the solenoid can be bench tested. too. if good
if all is good here, the lock it self is bad. major deal.
id never assume trans is bad unless all tests are done.
the big book has, ON CAR service.
now the Tcm BRAIN
WHAT IF it did not command ttc lockup at all
what could be wrong, answer inputs to it are wrong.
the engine and trans gears and RPM (speeds) are used
to select tables that decide lockup is ok to use.
that is why I said use a real scan tool one that sees ALL
jeep,obd2, factory codes. like the Innova 3160 does.
does this help?
htt p://w ww.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service
free fsm, remove 2 spaces to make linkwork ,
really , did you read the FSM yet: if not why not? why not read that, it covers all tests.to do. many are very simple, buy the book or get one used, ? yes there are tests. not fixes, there are 100s of parts there, in that slush pump. we do the tests and now know if problem is deap inside the best, we have a full video of this trans rebuild. good to show why its so expensive. long hard work.
techauthority <<< google that, and get FSM
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I dissconnected the battery and change the filters, check engine light stayed off for one day. Jeep GC 2001 So, now what?
ok just got a call from guy who replaced the whole trans, 2k buclks+ but his JR, tech, didnt notice the tranny ground strap missing., bingo, nor did jr, use his voltmeter to see the tranny ground rising as he shifts gears. the solenoids all need a perfect ground at all times. one the guy,, yes, the email me and tell this,,, new trans and on this car, the TCM was bad, or one of its input sesors bad. the jr tech, didnt check TCC output was dead, he failed !
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and vehicle speeds indicated failure of torque convertor clutch lock-up system (TCC/PTU solenoid) auto. trans. only).__________________5,428 views
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