What causes the torque converter to lock in gear?

What causes the torque converter to lock in gear?

When the TCC solenoid receives a signal from the engine control module (ECM), it opens a passage in the valve body and hydraulic fluid applies the TCC. When the ECM signal stops, the solenoid closes the valve and pressure is vented, causing the TCC to disengage. This lets the torque converter lock in “gear” or unlock out of “gear.”

What’s the diagnostic code for a torque converter clutch?

These situations normally end with complete transmission failure. A faulty torque converter clutch solenoid normally sets a Diagnostic Trouble Code (DTC), which causes the Check Engine Light to come on. A faulty torque converter clutch solenoid will normally set diagnostic trouble code P0740.

Where do I find the torque converter part number?

Chrysler, Ford, General Motors etc (alphabetically), then by Transmission Type (again alphabetically) and finally by Converter Code (TCS Code). The section below the Converter Part Number (Grey Band) is for information unique to the converter that may assist you in the correct idenification.

Is there a problem with the torque converter?

It could be a problem with the transmission, or the transmission could be perfectly fine and it could be a problem with the torque converter. Torque converter issues on a lot of older transmissions can be diagnosed by carrying out a stall-speed test.

Why do I need to lock up the torque converter?

The TCC System uses a solenoid-operated valve to couple the engine flywheel to the output shaft of the transmission through the torque converter. Lockup reduces slippage in the converter increasing fuel economy. For the converter clutch to apply, two conditions must be met: Internal transmission fluid pressure must be correct.

Chrysler, Ford, General Motors etc (alphabetically), then by Transmission Type (again alphabetically) and finally by Converter Code (TCS Code). The section below the Converter Part Number (Grey Band) is for information unique to the converter that may assist you in the correct idenification.

What is the purpose of the torque converter clutch?

The purpose of the Transmission Converter Clutch (TCC) feature is to eliminate the power loss of the torque converter stage when the vehicle is in a cruise mode. The TCC System uses a solenoid-operated valve to couple the engine flywheel to the output shaft of the transmission through the torque converter.

What is the torque ratio of a Duramax torque converter?

Stall Torque Ratio 2.01:1, Codes: 29530318, 29538348, 29538529, 29541293, 29543003 Numbers are on bar code labels next to mounting pads Year Engine Dia Hub SPL Pilot Mount Pilot Center To Bolt Center Stall 2001 Duramax Diesel 13 3/8″ 2.293 25 1.701 6 Pads 5 3/4″ 35-2BC

When the TCC solenoid receives a signal from the engine control module (ECM), it opens a passage in the valve body and hydraulic fluid applies the TCC. When the ECM signal stops, the solenoid closes the valve and pressure is vented, causing the TCC to disengage. This lets the torque converter lock in “gear” or unlock out of “gear.”

What should I do if my converter lock up?

If the TCC fails to disengage when the vehicle comes to a stop, the engine will stall. Before attempting to diagnose converter clutch electrical problems, mechanical checks such as linkage adjustments and oil level should be performed and corrected as needed.

Why do I need a half stick on my transmission?

You want a half-stick reading because fluid expands as it warms. Operating temperature is 150 to 170 degrees F. If (with a fluid reading on the dipstick) your transmission doesn’t engage, control pressure likely isn’t reaching servos and clutches.

What does it mean when your transmission is clunking?

Check your transmission dipstick as per the manufacturer’s direction for level and condition. If there is buzzing, clunking, humming noise. A buzzing, clicking, humming, roaring noise from inside the transmission is usually a symptom of a bad bearing, planetary gears damage, or other internal problem.