Ford 2003 Mustang Workshop Manual page 2309

SECTION 307-01: Automatic Transaxle/Transmission
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
Shift Speeds 4.6L 4V MACH 1 (3.55:1
Axle Ratio)
Throttle Position Shift MPH
Light throttle
TP voltage
1.25 volts
Closed throttle
Wide open throttle 1-2 36-44
Shift Speeds 4.6L 2V HO (3:27:1 Axle
in this section.
Km/H
1-2 10-14 16-23
2-3 18-22 29-35
3-4 34-37 55-60
4-3 22-25 35-40
3-2 12-16 19-26
2-1 11-7 18-11
58-71
2-3 75-83 121-134
3-2 70 113
2-1 33 53
2003 Mustang Workshop Manual