E 450 V8-5.4L (2009)
Torque Converter: Testing and Inspection
4R70E/4R75E
Torque Converter Diagnosis
Torque Converter Diagnosis
Prior to torque converter installation, all diagnostic procedures must be followed. This is to prevent the unnecessary installation of good torque
converters. Only after a complete diagnostic evaluation can the decision be made to install a new torque converter.
Begin with the normal diagnostic procedures as follows:
1. Preliminary Inspection
2. Know and understand the customer concern
3. Verify the condition - carry out the torque converter operation test See: Torque Converter Operation Test
4. Carry out diagnostic procedures
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Carry out On-Board Diagnostic (OBD); refer to Diagnostics. See: Transmission Control Systems/Testing and Inspection/Initial Inspection and
Diagnostic Overview/4R70E/4R75E/Diagnostics
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Repair all non-transmission related DTCs first.
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Repair all transmission DTCs.
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Rerun OBD to verify repair.
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Carry out Line Pressure Test. Refer to Special Testing Procedures. See: Transmission Control Systems/Testing and Inspection/Component Tests
and General Diagnostics/4R70E/4R75E/Special Testing Procedures/Line Pressure Test See: Transmission Control Systems/Testing and
Inspection/Component Tests and General Diagnostics/4R70E/4R75E/Special Testing Procedures
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Carry out Stall Speed Test. Refer to Special Testing Procedures. See: Transmission Control Systems/Testing and Inspection/Component Tests and
General Diagnostics/4R70E/4R75E/Special Testing Procedures/Stall Speed Test See: Transmission Control Systems/Testing and
Inspection/Component Tests and General Diagnostics/4R70E/4R75E/Special Testing Procedures/Special Testing Procedures
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Carry out Diagnostic Routines. Refer to Diagnosis By Symptom. See: Transmission Control Systems/Testing and Inspection/Symptom Related
Diagnostic Procedures/4R70E/4R75E/Diagnostic Routines See: Transmission Control Systems/Testing and Inspection/Symptom Related
Diagnostic Procedures/4R70E/4R75E/Diagnosis By Symptom
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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 changing the
torque converter.
Torque Converter Operation Test
Torque Converter Operation Test
This test verifies that the Torque Converter Clutch (TCC) control system and the torque converter are operating correctly.
1. Carry out Self-Test with scan tool. Refer to Computers and Control Systems Information. Check for DTCs.
2. Connect a scan tool.
3. Bring the engine to normal operating temperature by driving the vehicle at highway speeds 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. Engine rpm should increase when brake pedal is tapped, and decrease about 5 seconds after pedal is released. If this does not occur, see torque
converter operation concerns. Refer to Diagnosis By Symptom See: Transmission Control Systems/Testing and Inspection/Symptom Related
Diagnostic Procedures/4R70E/4R75E/Diagnosis By Symptom.
6. If the vehicle stalls in (D) or manual 2 at idle with vehicle at a stop, move the selector lever to manual 1 position. If the vehicle stalls, see torque
converter operation concerns. Refer to Diagnosis By Symptom See: Transmission Control Systems/Testing and Inspection/Symptom Related
Diagnostic Procedures/4R70E/4R75E/Diagnosis By Symptom. If the vehicle does not stall in (D), refer to Diagnosis By Symptom See:
Transmission Control Systems/Testing and Inspection/Symptom Related Diagnostic Procedures/4R70E/4R75E/Diagnosis By Symptom.
7. If the vehicle exhibits a vibration during the road test, complete the Road Test Evaluation Form. This form will aid the technician in determining
