Explorer Sport Trac 2WD V6-4.0L (2009)
Torque Converter: Testing and Inspection
5R55S
Torque Converter
Torque Converter
1. A new or remanufactured torque converter must be installed if one or more of the following statements is true:
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A torque converter malfunction has been determined based on complete diagnostic procedures.
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Converter stud or studs, impeller hub or bushing are damaged.
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Discoloration (due to overheating).
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Evidence of transmission assembly or fluid contamination due to the following transmission or converter failure modes:
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Major metallic failure.
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Multiple clutches or clutch plate failures.
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Sufficient component wear which results in metallic contamination.
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Internal torque converter contamination present. For additional information, refer to Torque Converter Contamination Inspection See:
Testing and Inspection/Component Tests and General Diagnostics/5R55S/Torque Converter Contamination Inspection.
Torque Converter Diagnosis
Torque Converter Diagnosis
Prior to installing a new torque converter, all diagnostic procedures must be followed. This is to prevent the unnecessary installation of a good torque
converter. 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 concern.
3. Verify the concern - carry out the Torque Converter Clutch (TCC) Operation Test. Refer to Torque Converter Operation Test.
4. Carry out diagnostic procedures.
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Run On-Board Diagnostic (OBD). See On-Board Diagnostics with Scan Tool. Refer to Diagnostics See: Transmission Control Systems/Testing
and Inspection/Initial Inspection and Diagnostic Overview/5R55S/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 test to verify repair.
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Carry out the Line Pressure Test. Refer to Special Testing Procedures See: Transmission Control Systems/Testing and Inspection/Component
Tests and General Diagnostics/5R55S/Special Testing Procedures.
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Carry out the Stall Speed Test. Refer to Special Testing Procedures. See: Transmission Control Systems/Testing and Inspection/Component Tests
and General Diagnostics/5R55S/Special Testing Procedures/Stall Speed Test See: Transmission Control Systems/Testing and
Inspection/Component Tests and General Diagnostics/5R55S/Special Testing Procedures
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Carry out the Diagnosis by Symptom Index. Refer to Diagnosis By Symptom See: Transmission Control Systems/Testing and
Inspection/Symptom Related Diagnostic Procedures/5R55S/Diagnosis By Symptom.
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Use the 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 service as necessary before servicing the torque converter.
Torque Converter Operation Test
This test verifies that the TCC control system and the torque converter are operating correctly.
1. Carry out the Self Test. See On-Board Diagnostics with Scan Tool. Refer to Diagnostics See: Transmission Control Systems/Testing and
Inspection/Initial Inspection and Diagnostic Overview/5R55S/Diagnostics. Check for DTCs. Refer to the Diagnostic Trouble Code (DTC) Charts
