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01 civic lockup problem?
I recently rebuilt an 01 civic transmission. Now I have a TCC lockup problem. The torque converter was swapped with a re-man twice now. I have since torn down the tranny again to inspect the valve body and clutches which, I can find no obvious problems. The second accumulator has and extra spring but ran fine for 80000 miles and I have good advice to reinstall it as it has nothing to do with lock up. All of the valves move freely and all of the o rings are new and un damaged. I have electrically tested the tcc solenoid and the ohms are good but when it is hooked up to 12 volts it tries to move the valve but doesn't. I need to know whether the tcc solenoid is normally open or closed, and if it requires hydraulic pressure to assist in valve movement. Also if there are any tests that you know of that I can do besides these. The car runs great through three gears and only slips in fourth which triggers the p0740 code for TCC solenoid circuit malfunction
if you want the diagnostics from the honda manual email me and i'll scan them for you. you can send me an email by clicking on the icon above my name to the left of this reply. be sure to include an email address that I can send a pdf file to as Yahoo Answers won't allow an attachment to an answer.
also, honda had a note to check the torque converter o-ring for damage or for being flat before reinstalling the trans as that could cause a pressure loss that would generate the code.
here's the 'how it works' part of the troubleshooting for P0740
The power transfer capacity of the torque converter clutch is controlled by the balance of automatic transmission fluid (ATF)
supply and discharge to/from the torque converter. When applying hydraulic pressure from the internal pressure side, the
torque converter clutch turns ON, and when applying hydraulic pressure from the back pressure side, the torque converter
clutch turns OFF. The more the hydraulic pressure from the internal pressure side increases, the more the power transfer
capacity of the torque converter clutch increases. The direction of hydraulic pressure supply is switched over by the torque
converter clutch solenoid valve and the lock-up shift valve. ATF is supplied from the internal pressure side to the torque converter
clutch solenoid valve when the signal from the powertrain control module (PCM) is ON (12 V), and ATF is supplied
from the back pressure side when it is OFF (0 V). The balance of internal pressure and back pressure is controlled by the A/
T clutch pressure control solenoid valve B, the lock-up control valve, and the lock-up timing valve. The A/T clutch pressure
control solenoid valve B maximizes the power transfer capacity of the torque converter clutch when the signal from the PCM
is OFF (0 A), and it minimizes the power transfer capacity of the torque converter clutch when the signal from the PCM is ON
(1 A). If the ratio of engine speed and mainshaft speed is not about 1:1 while the PCM is issuing the command to turn the
torque converter clutch solenoid valve ON, and the A/T clutch pressure control solenoid valve B OFF, the PCM detects a
faulty lock-up control system and stores a DTC.
hope that helps
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