Question about 1992 Chevrolet Lumina

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92 chevy lumina 3.1 Torque convert lock and unlock

The torque converter will not stay locked on, it just kicks in and out at any speed. Changed speed sensor cause speedometer jumps and is inacurate, nothing changed. Any ideas?

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Replace the TCC solenoid, if that doesn't fix it you will need to replace the torque converter, it may be shorted

Posted on Jun 17, 2009

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Posted on Jan 02, 2017

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1 Answer

P0740 honda odyssey


P0740 Honda - Transmission Lock-Up Control System Fault Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness is open or shorted
- Torque converter clutch solenoid valve circuit poor electrical connection

Tech notes
On some Honda vehicles the P0740 code may be set by an overheating torque converter problem which is caused by an insufficient flow to the torque converter release circuit.

P0740 Honda Description
The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.
Lock-up operation, however, is prohibited when A/T fluid temperature is too low.
When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

Dec 04, 2013 | 2000 Honda Accord

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My 1997 Mercury Grand Marquis transmission location of the torque converter lock up sensor


There is no part called the lockup sensor, the lock up occurs when the Vehicle speed sensor sends a signal to the Transmission control module that the truck has reached the minimum speed and throttle angle for lock up to take place, it then activates a switch inside the transmission that locks up the torque converter clutch.

Nov 02, 2012 | Cars & Trucks

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How can you tell if your computer is going out


Thats sounds alot like your torque converter

Oct 29, 2012 | 1995 Chevrolet Lumina

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1998 jeep grand cherokee 4x4. have the p0740 code. have to start from neutral, then shifts faily well. May start fluttering and making noise, have to put back to N, then to D and once again will shift. ...


P0740 JEEP - Torque Converter Clutch Circuit
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission shift shock
- Vehicle may not shift into the highest gear

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted

When is the code detected?
Torque Converter Clutch (TCC) unlocked for 10 sec., ECM commands converter lock-up and did not record engine speed drop.

P0740 JEEP Description
The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.

Lock-up operation, however, is prohibited when A/T fluid temperature is too low.

When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

Mar 27, 2011 | 1998 Jeep Cherokee 4WD

1 Answer

I have a 1500, 5.7, 2 wheel drive with a 4 speed transmission with O/D . How many times should it shift including the O/D and what does the lock in torque converter have to do with it?


It should shift 4 times. 1-2, 2-3, 3-4 Then you will feel the torque converter clutch lock up which feels like a shift. The torque converter locks to increase gas mileage.

Dec 28, 2010 | 1993 GMC Sierra

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How do i replace a tcc solenid in a 95 beretta 3.1 v-6


its just a sensor plug on the tranny, the solenoid reads the speed of the transmission (car) and sends the signal to the computer which identifies that the car has reached proper crusing speed and is not under heavey load (full throttle) it then "locK" the torque converter to not allow any slippage like a standard automatic torque converter, basically making the torque converter act like a clutch,,, thus the name TCC torque converter clutch. So to help you out just unlug the sensor/solenoid and it will stop locking up your converter. Problem solved! MOney saved 2 to 3 hundred bucks!

May 04, 2010 | 1995 Chevrolet Beretta

1 Answer

1994 mazda cronos 2.00 v6 auto car idles ok drives ok but when i come to a stop it stalls in gear been atuo


This sounds like a problem with the torque converter lockup system. Usually the torque converter lockup solenoid is at fault in your condition. This solenoid usually locks up the torque convertor (which acts like a clutch in an automatic transmission) when you are driving at a certain speed, and unlocks it when you press the brake, and/or come to a stop. When a torque converter stays locked up, and you stop the vehicle, it acts like a vehicle with a manual transmission, if you bring the vehicle to a complete stop without applying the clutch pedal, the brakes stall the engine. Basically, if the torque converter can't unlock, even when you come to a stop, the engine is still locked to the transmission, and even when you apply the brakes, the torque converter doesn't slip and freewheel like it should, but instead stalls the engine.

May 07, 2009 | 1994 Mazda 626

1 Answer

Torque converter lock up problems


yeah i know exactly what it is its one of the transmission solenoids i beleive its called the torque converter circuit

Apr 13, 2009 | 1999 Chevrolet Suburban

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