Automatic Transmission - 4R100: Specifications Ford Econoline E250

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

Torque Demand

The torque demand downshift occurs (automatically) during part throttle acceleration when the demand for torque is greater than the engine can provide at that gear ratio.

Torque Converter

The torque converter transmits and multiplies torque. The torque converter is a four-element device

1. Impeller assembly
2. Turbine assembly
3. Reactor assembly
4. Clutch and damper assembly

The standard torque converter components operate as follows

Scheme 1

1. Rotation of the converter housing and impeller set the fluid in motion.
2. The turbine reacts to the fluid motion from the impeller, transferring rotation to the geartrain through the input shaft.
3. The reactor redirects fluid going back into the impeller, providing for torque multiplication.
4. The clutch and damper assembly dampens powertrain torsional vibration and provides a direct mechanical connection for improved efficiency.
5. Power is transmitted from the torque converter to the planetary gearsets and other components through the input shaft.

Torque Converter Clutch (TCC) Solenoid

The torque converter clutch solenoid (TCC) provides torque converter clutch control by shifting the converter clutch control valve to apply or release the torque converter clutch.

For modulated torque converter operations the powertrain control module (PCM) sends the TCC solenoid controlled pulse width modulated (PWM) signals to apply or release the torque converter clutch.

Torque Converter Diagnosis

Prior to installing a new or remanufactured torque converter, all diagnostic procedures must be followed. This is to prevent the unnecessary installation new or remanufactured torque converters. Only after a complete diagnostic evaluation can the decision be made to install a new or remanufactured torque converter.

Begin with the normal diagnostic procedures as follows

1. Preliminary Inspection.
2. Know and Understand the Customer's Concern.
3. Verify the Concern-Carry out the «Torque Converter Clutch Operation Test»(ref-210155-S25103634872005121300000) .
4. Carry out Diagnostic Procedures. Run on-board diagnostics; refer to «On-Board Diagnostics with Diagnostic Tool»(ref-210155-S33915250642005121300000) . Repair all non-transmission-related DTCs first. Repair all transmission DTCs. Rerun on-board diagnostics to verify repair. Carry out «Line Pressure Test»(ref-210155-S16767893192005121300000) . Carry out «Stall Speed Test»(ref-210155-S34716238472005121300000) . Carry out «Diagnostic Routines»(ref-210155-S32540025522005121300000) . Use the Diagnosis by Symptom Index to locate the appropriate routine that best describes the symptom(s). The routine will list all possible components that may cause or contribute to the symptom. Check each component listed; diagnose and repair as required, before repairing the torque converter.

Torque Converter Clutch Operation Test

This test verifies that the torque converter clutch control system and the torque converter are operating correctly.

1. Carry out Quick Test; refer to «On-Board Diagnostics with Diagnostic Tool»(ref-210155-S33915250642005121300000) . Check for DTCs; Refer to the «DIAGNOSTIC TROUBLE CODE CHART»(ref-210155-S23104564142005121300000) .
2. Connect a tachometer to the engine.
3. Bring the engine to normal operating temperature by driving the vehicle at highway speeds for approximately 15 minutes in (D) position.
4. After normal operating temperature is reached, maintain a constant vehicle speed of about 80 km/h (50 mph) and tap brake pedal with the left foot.
5. The correct operation of the TCC can be verified by using a scan tool and monitoring the TCC during the 4-3 coast down shift. Engine rpm should increase when brake pedal is tapped and decrease about five seconds after pedal is released. If this does not occur, refer to «DIAGNOSIS BY SYMPTOM INDEX»(ref-210155-S04106630252005121300000) .
6. If the vehicle stalls in (D) or MANUAL 2 at idle with vehicle at a stop, move the transmission range selector lever to MANUAL 1 position. If the vehicle stalls, refer to «DIAGNOSIS BY SYMPTOM INDEX»(ref-210155-S04106630252005121300000) . Repair as required. If the vehicle does not stall in (D), refer to «DIAGNOSIS BY SYMPTOM»(ref-210155-S07423603722005121300000) .

Pinpoint Test C: Torque Converter Clutch (TCC) Solenoid

Note. Refer to the Transmission Vehicle Harness Connector illustration preceding these pinpoint tests.

Scheme 2

Scheme 3

Scheme 4

Fluid Leakage in Torque Converter Area

In diagnosing and correcting fluid leaks in the front pump assembly and torque converter area, use the following procedures to locate the exact cause of the leakage. Leakage at the front of transmission, as evidenced by fluid around the torque converter housing, may have several sources. By careful observation it is possible, in many instances, to pinpoint the source of leak before removing the transmission from the vehicle. The paths which the fluid takes to reach the bottom of the torque converter housing are shown in the illustration. The five steps following correspond with the numbers in the illustration.

Scheme 5

1. Fluid leaking by the front pump seal lip will tend to move along the impeller hub and onto the back of the impeller housing. Except in the case of a total seal failure, fluid leakage by the lip of the seal will be deposited on the inside of the torque converter housing only, near the outside diameter of the housing.
2. Fluid leakage by the outside diameter of the front pump seal and front pump body will follow the same path that leaks by the inside diameter of the front pump seal follow.
3. Fluid leakage from the converter seal weld or converter to flexplate stud weld will appear at the outside diameter of the torque converter, on the back face of the flexplate, and in the converter housing only near the flexplate. Fluid leaks from the torque converter will leave a ring of fluid around the inside of the torque converter housing.
4. Fluid that leaks by a front pump to case bolt or pump gasket will be deposited on the inside of the torque converter housing only. Fluid will not be deposited on the back of the torque converter.
5. Engine oil leaks are sometimes incorrectly diagnosed as transmission pump gasket leaks. The following areas of possible leakage should also be checked to determine if engine oil leakage is causing the concern. Leakage at the valve cover gasket may allow oil to flow over the torque converter housing, or seep down between the torque converter housing and cylinder block, causing oil to be present in or at the bottom of the torque converter housing. Oil galley plug leaks will allow oil to flow down the rear face of the cylinder block to the bottom of the torque converter housing. Leakage at the crankshaft rear oil seal will work back to the flexplate, and then into the torque converter housing. Leakage at oil pressure sensor.

Vehicles Equipped With A Fluid Pan And Torque Converter Drain Plug

DRAINING

Vehicles Not Equipped With A Fluid Pan Or A Torque Converter Drain Plug

DRAINING

Vehicles Equipped With A Torque Converter Drain Plug And Without A Fluid Pan Drain Plug

1. A new or remanufactured torque converter must be installed if one or more of the following statements is true: A torque converter malfunction has been determined based on complete diagnostic procedures. Converter stud or studs, impeller hub or bushing are damaged. Discoloration (due to overheating). Evidence of transmission assembly or fluid contamination due to the following transmission or converter failure modes: Major metallic failure. Multiple clutches or clutch plate failures. Sufficient component wear which results in metallic contamination. Internal torque converter contamination present. For additional information refer to «TORQUE CONVERTER CONTAMINATION INSPECTION»(ref-210155-S18850258082005121300000) .

TORQUE CONVERTER CONTAMINATION INSPECTION

Scheme 6

1. If a new or remanufactured torque converter is not being installed, the following steps must be completed.
2. With the torque converter on a bench, pour a small amount of transmission fluid from the torque converter onto an absorbent white tissue or through a paper filter and examine the fluid.
3. Observe the color and odor of the fluid. The fluid should be red, not brown or black. Odor may indicate an overheating condition such as clutch disc or band failure.
4. Examine the stain on the tissue for evidence of particles (speck of any kind). Examine the fluid level indicator for signs of antifreeze (gum or varnish). If particles are present in the fluid or there is evidence of engine coolant or water, a new torque converter must be installed.
5. If there are no particles or contamination present, drain the remainder of the transmission fluid from the torque converter.
6. Add 1.9 liter (2 qt.) of clean automatic transmission fluid into the converter and agitate by hand.
7. Thoroughly drain the fluid.
8. If equipped, install a new torque converter drain plug.

See also:
• JACKING & LIFTING
• DRIVESHAFT