F 350 4WD Super Duty V8-6.0L DSL Turbo VIN P (2004)
Torque Converter: Testing and Inspection
4R100 - Automatic Transmission
Torque Converter Diagnosis
Torque Converter Diagnosis
Prior to torque converter replacement, all diagnostic procedures must be followed. This is to prevent the unnecessary installation of new or
remanufactured torque converters. Only after a complete diagnostic evaluation can the decision be made to install new or remanufactured torque
converters.
NOTE: If equipped, turn the power take-off unit off for correct test results. For a description of PTO operation, refer to Transmission Electronic
Control System. See: Transmission Control Systems/Description and Operation/4R100 Automatic Transmission
During PTO operation, the on-board diagnostics will be disabled. However, the circuit checks made by the diagnostic system and the FMEM will
continue. The PTO must be turned off to do on-board diagnostics.
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. See: Torque Converter Operation Test
4. Carry out Diagnostic Procedures.
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Run on-board diagnostics. Refer to On-Board Diagnostics with diagnostic tool. See: Transmission Control Systems/Testing and
Inspection/Reading and Clearing Diagnostic Trouble Codes/4R100/Displaying & Reading Trouble Codes/On-Board Diagnostics With Scan
Tool
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Repair all non-transmission-related DTCs first.
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Repair all transmission DTCs.
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Rerun on-board diagnostics to verify repair.
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Carry out Line Pressure Test. See: Transmission Control Systems/Testing and Inspection/Component Tests and General
Diagnostics/4R100/Component Tests/Line Pressure Test
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Carry out Stall Speed Test. See: Transmission Control Systems/Testing and Inspection/Component Tests and General
Diagnostics/4R100/Component Tests/Stall Speed Test
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Carry out Diagnostic Routines.
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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 Drainback Test
Torque Converter Drainback Test
1. Drive the vehicle for 30-60 minutes to attain normal operating temperature.
2. Check the transmission fluid level. Add fluid only if required.
3. Drive the vehicle through 8 to 10 cycles of 1/2 throttle, 1-2 upshifts to elevate the transmission temperature. Then proceed as follows:
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Park the vehicle on level ground.
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Allow the vehicle to sit for 30-60 minutes.
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Check and note the fluid level on the fluid level indicator with the engine off, in PARK. The following example shows the fluid level after 45
minutes.
4. Allow the vehicle to sit for a minimum of 24 hours. Check and note the fluid level.
5. If the fluid has risen 25.4 mm (1 inch) or more above the level in the first check excessive converter drainback has occurred.
6. If excessive drainback has occurred:
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stuck open check ball in rear cooler line case fitting.
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no check ball in rear cooler line case fitting.
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incorrect case cooler line case fitting (without check ball) installed.
7. Repair as required and recheck.
Torque Converter Operation Test
