2003 FORD MUSTANG Workshop Manual

airbag off service interval reset coolant garage door opener fuel CD player

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FORD MUSTANG 2003 Workshop Manual DIAGNOSIS AND TESTING
Preliminary Inspection
The following items must be checked prior to beginning the diagnostic procedures:
Know and Understand the Concern
In order to correctly diagnose a conc

Page 2306 of 4378

FORD MUSTANG 2003 Workshop Manual CAUTION: The vehicle should not be driven if the fluid level indicator shows the fluid
below the DO NOT DRIVE mark or internal failure could result.
NOTE: If the vehicle has been operated for an e

CAUTION: The vehicle should not be driven if the fluid level indicator shows the fluid
below the DO NOT DRIVE mark or internal failure could result.
NOTE: If the vehicle has been operated for an extended period, at high highway speeds, in city traffic,
during hot weather, or while pulling a trailer, the fluid needs to cool down to obtain an accurate
reading.
NOTE: The fluid level reading on the indicator will differ from operating and ambient temperatures. The
correct reading should be within the normal operating temperature range.
Under normal circumstances the fluid level should be checked during normal maintenance. If the
transmission starts to slip, shifts slowly, or shows signs of fluid leaking, the fluid level should be
checked.
1. With the transmission in P (PARK), the engine at idle, foot pressed on the brake, move the range selector lever through each gear and allow engagement of each gear. Place the
transmission range selector lever in the P position.
2. Wipe the fluid level indicator cap and remove the indicator.
3. Wipe the indicator with a clean cloth.
4. Install the indicator back in the filler tube until it is fully seated, then remove the indicator. The fluid level should be within the normal operating temperature range.
High Fluid Level
A fluid level that is too high may cause the fluid to become aerated due to the churning action of the
rotating internal parts. This will cause erratic control pressure, foaming, loss of fluid from the vent tube,
and possible transmission failure. If an overfill reading is indicated, drain and refill the transmission.
Low Fluid Level
A low fluid level could result in poor transmission engagement, slipping, or failure. This could also
indicate a leak in one of the transmission seals or gaskets. Adding Fluid Item Description
1 Fluid level at room temperature 10°-
35°C (50°-95°F) 2 Fluid level at operating temperature 66°-
77°C (150°-170°F) 3 Do not drive mark Klj . 2 ba
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FORD MUSTANG 2003 Workshop Manual CAUTION: The use of any other type of transmission fluid than specified could result in
transmission failure.
If fluid needs to be added, add fluid in 0.25L (1/2 pint) increments through the filler

Page 2308 of 4378

FORD MUSTANG 2003 Workshop Manual DIAGNOSIS AND TESTING
Road Testing Vehicle
NOTE:
Always drive the vehicle in a safe manner according to the driving conditions and obey all
traffic laws.
The shift point road test and torque conv

Page 2309 of 4378

FORD MUSTANG 2003 Workshop Manual DIAGNOSIS AND TESTING
Shift Point Road Test
This test verifies that the shift control system is operating correctly.
1. Bring engine and transmission up to normal operating temperature.
2. Operate

DIAGNOSIS AND TESTING
Shift Point Road Test
This test verifies that the shift control system is operating correctly.
1. Bring engine and transmission up to normal operating temperature.
2. Operate vehicle with transmission range selector lever in (D) position.
3. NOTE: Shift speed ranges are approximate for all applications. For specific applications
(engine, axle ratio and application) refer to the Automatic Transmission Specification Issue,
available from Ford Customer Service Division.
Apply minimum throttle and observe speeds at which upshift occurs and torque converter
engages; refer to the 4R70W Shift Speeds chart in this section.
4. With the transmission in Overdrive (fourth gear), press the transmission control switch. The transmission should downshift to third gear. Release the accelerator pedal; engine braking
should occur.
5. Press accelerator pedal to floor, wide open throttle (WOT). Transmission should shift from third to second gear, or third to first, depending on vehicle speed. Torque converter clutch should
disengage and then reapply.
6. With the transmission in (D) position and speed above 80 km/h (50 mph) and less than half throttle, move the transmission range selector lever from (D) position to manual 2 position and
remove pressure from the accelerator pedal. Transmission should immediately downshift into
second gear. With vehicle remaining in manual 2 position, move the transmission range selector
lever into manual 1 position, and release accelerator pedal. Transmission should downshift into
first gear at speeds approximately below 45- 56 km/h (28-35 mph).
7. If transmission fails to upshift/downshift or torque converter clutch does not apply and release, refer to Diagnosis By Symptom in this section.
SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Shift Speeds 4.6L 4V MACH 1 (3.55:1
Axle Ratio)
Throttle Position Shift MPH Km/H
Light throttle 1-
2 10-14 16-23
TP voltage 2-
3 18-22 29-35
1.25 volts 3-
4 34-37 55-60
Closed throttle 4-
3 22-25 35-40
3-2 12-16 19-26
2-1 11-7 18-11
Wide open throttle 1-
2 36-44 58-71
2-3 75-83 121-134
3-2 70 113
2-1 33 53
Shift Speeds 4.6L 2V HO (3:27:1 Axle Klj . 1 ba
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FORD MUSTANG 2003 Workshop Manual Ratio)
Throttle Position Shift MPH Km/H
Light throttle 1-
2 9-12 14-19
TP voltage 2-
3 14-18 23-29
1.25 volts 3-
4 36-38 58-61
Closed throttle 4-
3 26-22 42-35
3-2 15-11 24-18

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FORD MUSTANG 2003 Workshop Manual Klj . 3 ba
32003 Mustang Workshop Manual
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Page 2312 of 4378

FORD MUSTANG 2003 Workshop Manual 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 unnecessar

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.
z 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.
z Carry out Line Pressure Test. For additional information, refer to Special Testing Procedures in
this section.
z Carry out Stall Speed Test. For additional information, refer to Special Testing Procedures in
this section.
z Carry out Diagnostic Routines. For additional information, refer to Diagnosis By Symptom in this
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 in this section.
SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Klj . 1 ba
42003 Mustang Workshop Manual
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