Ford 2003 Mustang Workshop Manual page 2312

SECTION 307-01: Automatic Transaxle/Transmission
DIAGNOSIS AND TESTING
Torque Converter Diagnosis
Prior to the installation of a new or remanufactured torque converter, all diagnostic procedures must be
followed. This is to prevent the unnecessary installation of 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 condition — carry out the torque converter operation test.
4. Carry out diagnostic procedures.
Carry out on-board diagnostics; refer to Diagnostics.
Repair all non-transmission related DTCs first.
Repair all transmission DTCs.
Rerun on-board diagnostic to verify repair.
Carry out Line Pressure Test. For additional information, refer to
this section.
Carry out Stall Speed Test. For additional information, refer to
this section.
Carry out Diagnostic Routines. For additional information, refer to
section.
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
This test verifies that the torque converter clutch control system and the torque converter are operating
correctly.
5. Carry out Quick Test with scan tool. For additional information, refer to the Powertrain
Control/Emissions Diagnosis (PC/ED) manual. Check for DTCs.
6. Connect a tachometer to the engine.
7. Bring the engine to normal operating temperature by driving the vehicle at highway speeds for
approximately 15 minutes in (D) position.
8. 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.
9. Engine rpm should increase when brake pedal is tapped, and decrease about five seconds after
pedal is released. If this does not occur, see torque converter operation concerns. For additional
information, refer to Diagnosis By Symptom
2003 Mustang Workshop Manual
Special Testing Procedures
Special Testing Procedures
Diagnosis By Symptom
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