XJ 4.0 Code P0740 Help

JMOliver

JMOliver

Well-Known Member
Joined
Jul 17, 2008
Location
Winston-Salem
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specs.
99 xj 4.0 3 spd auto with od

Im throwing code p0740

got a lil bit of a noise from bellhousing area, had it checked and it isnt cracked.
some times when put into R or D it clunks into gear.
drives great, shifts fine.

Driven it this way for 5 months no problems. just light coming on and off every now and then

noticed today in od that it wasnt going into OD but when put into 3rd rpms went down. but it started working normally in a couple miles. ( A/C on )

I know what the Code means but not really sure..

TCC malfuntion or something.
checked fluid and it was still normal looking ( Pinkish ) but smelled not to good.

any suggestions?
 
That's the fault code for number 3 solenoid malfunction. Mitchell says could be one of three things. Internal failure, short to ground, short to 12volts
 
Im thinking its something with wiring. ( Wishful thinking ) B/c my check engine will come and go. more now then it did but might go off for a day-week. then back on and off. noticed it before when it did it just now and then when it rained or i went 4x4ing.

also when i first bought jeep the oil guage didnt work. So i go to checking and the tranny mount wasnt even bolted in. Put new one in and the oil guage starting working agian. so im hoping its something easy.

I need to change the tranny fluid also.
 
From alldatadiy.com:
SYMPTOM
P0740 - TORQUE CONVERTER CLUTCH, NO RPM DROP AT LOCKUP

WHEN MONITORED
Continuously with the key ON.

SET CONDITION
If the TCC cannot achieve the desired drop in engine RPM when the TCC solenoid is near maximum duty cycle. Three consecutive bad tests are required to set the code.

POSSIBLE CAUSES

* Torque converter
* Transmission fluid contaminated
* Transmission internal problems
* Misfire trouble code set
 
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