Expedition 2WD V8-281 4.6L SOHC (1998)
Torque Converter: Testing and Inspection
Diagnosis
Prior to torque converter replacement, all Transmission Control Systems diagnostic procedures must be followed. This is to prevent the unnecessary
replacement of good torque converters. Only after a complete diagnostic evaluation can the decision be made to replace the 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-Perform the Torque Converter Clutch Operation Test.
4. Perform Diagnostic Procedures.
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Run on-board 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 on-board diagnostic to verify repair.
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Perform Line Pressure Test.
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Perform Stall Speed Test.
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Perform Diagnostic Routines.
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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 required before repairing the torque converter.
