2003 FORD MUSTANG torque

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
32003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

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
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

10. If the vehicle stalls in (D) or manual 2 at idle with vehicle at a stop, move the transmission range
selector lever to manual 1 position. If the vehicle stalls, see torque converter operation
concerns. For additional information, refer to Diagnosis By Symptom in this section. If the
vehicle does not stall in (D), refer to Diagnosis By Symptom in this section.
11. If the vehicle exhibits a vibration during the road test, complete the Road Test Evaluation Form. This form will aid the technician in determining the source of the vibration.
NOTE: The following is a list of common vehicle concerns that have been misdiagnosed as torque
converter clutch shudder. For diagnosis of the following items refer to the appropriate sections of the
workshop manual and the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
zspark plugs - check for cracks, high resistance or broken insulators
z plug wires
z fuel injector - filter may be plugged
z fuel contamination - poor engine performance
z EGR valve - valve may let in too much exhaust gas and cause engine to run lean
z vacuum leak - engine will not get correct air/fuel mixture
z MAP/MAF sensor - incorrect air/fuel mixture
z HO2S sensor - too rich/lean air/fuel mixture
z fuel pressure - may be too low
z engine mounts - loose/damaged mounts can cause vibration concerns
z axle joints - check for vibration Torque Converter Road Evaluation Form
1) Does the Torque Converter
Engage/Disengage? Yes ·
GO to Step 2. No ·
REFER to Diagnosis By Symptom —
Torque Converter No Apply Routine
240/340 and Always Applied Routine
241/341 in this section for further
diagnosis information. Repair as
required, verify converter operation
and then continue. 2) Does vibration occur during 3-
4 or 4-3 shift at:
light, medium, or heavy throttle? Light ·
May be torque converter clutch
shudder. GO to Step 3. Medium ·
May be torque converter clutch
shudder. GO to Step 3. Heavy ·
Not torque converter clutch shudder
— converter does not engage due to
PCM strategy. REFER to Section 100 - 04 and
Diagnosis By Symptom —
Noise/Vibration Routine 254/354
in this section for further diagnosis. 3) Is the problem vehicle speed dependent Yes ·
Not torque converter clutch shudder Klj . 2 ba
42003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

(operating at steady speed, i.e. 64 km/h (40 mph)
regardless of transmission range. Verify by
manually selecting 2nd, OD cancel, and OD. —
REFER to Section 100 - 04 and
Diagnosis By Symptom —
Noise/Vibration Routine 254/354 in
this section for further diagnosis. No ·
GO to Step 4. 4) Is the problem engine-
rpm dependent?
(Occurs at the same engine rpm independent of
transmission gear. Verify by holding same rpm in
each transmission gear.) Yes ·
Not torque converter clutch shudder
— REFER to Section 100 - 04 and
Diagnosis By Symptom —
Noise/Vibration Routine 254/354 in
this section for further diagnosis. No ·
GO to Step 5. 5) Does the problem occur in coast, steady
speed, or reverse range? Yes ·
Not torque converter clutch shudder
— REFER to Section 100 - 04 and
Diagnosis By Symptom —
Noise/Vibration Routine 254/354 in
this section for further diagnosis. No ·
GO to Step 6. 6) Does vibration occur during extended light
brake application? Yes ·
Not torque converter clutch shudder
— REFER to Section 100 - 04 ,
Section 206 - 00 and
Diagnosis By Symptom —
Noise/Vibration Routine
254/354 in this section for further
diagnosis. No ·
GO to Step 7. 7) If one of the driving modes in Step 2 identifies
a vibration which was not present in Steps 3-
6,
then there is a strong possibility that the vibration
is caused by the torque converter clutch function.
Carry out the repair procedures as found under
Disassembly/Assembly. Klj . 3 ba
42003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

z
75 - sets EPC pressure to 517 kPa (75 psi).
z 90 - sets EPC pressure to 620 kPa (90 psi).
z XXX - cancels OSC value sent.
z SEND - sends the values to PCM.
BENCH MODE Procedure for EPC
Follow operating instructions from the scan tool menu screen:
zSelect "Output State Control."
z Select "Trans - Bench Mode."
z Select "PIDs" to be monitored.
z Monitor all selected PIDs during test.
z Select "Parameters - EPC."
z Select Value "0- 620 kPa (0-90 psi)."
z Press "SEND" to send command.
z Select "XXX" to cancel at any time.
z Press "SEND."
OSC — Transmission DRIVE MODES
The DRIVE MODE allows control of three transmission parameters. Each mode/parameter has a
unique set of vehicle operating requirements that the technician is required to meet before being
allowed to operate OSC. The recommended procedure, when using the DRIVE MODE, is to control
one parameter at a time.
The DRIVE MODE allows the technician to carry out the following functions on the transmission:
zGR_CM - allows upshifts or downshifts.
z TCC - engages or disengages the torque converter clutch.
z EPC - increases/decreases EPC pressure.
GR_CM in DRIVE MODE
This OSC function is used to test the transmission shift functions.
The OSC functions for the GR_CM parameter allows the technician to choose the following options:
z1 - PCM selects 1st gear.
z 2 - PCM selects 2nd gear.
z 3 - PCM selects 3rd gear.
z 4 - PCM selects 4th gear.
OSC "GR_CM" Mode operates ONLY when:
zthe digital TR sensor is operational and no digital TR sensor DTCs are present.
z the vehicle speed sensor is operational and no VSS sensor DTCs are present. Klj . 4 ba
92003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

z
the engine is ON.
z the TCC is OFF.
z the transmission range selector lever is in O/D.
z the vehicle speed is greater than 3.2 km/h (2 mph).
OSC Command Values
z1 - PCM selects 1st gear.
z 2 - PCM selects 2nd gear.
z 3 - PCM selects 3rd gear.
z 4 - PCM selects 4th gear.
z XXX - cancels OSC value sent.
z SEND - sends the values to PCM.
DRIVE MODE Procedure for GR_CM
Follow operating instructions from the scan tool menu screen.
zSelect "Output State Control."
z Select "Trans - DRIVE MODE."
z Select "PIDs" to be monitored.
z Monitor all selected PIDs during test.
z Select "Parameters - GR_CM."
z Select Value "1- 4."
z Press "SEND" to send command.
z Re- Select Value "1- 4."
z Press "SEND" to send command.
z Select "XXX" to cancel at any time.
z Press "SEND."
TCC in DRIVE MODE
This OSC function is used to test whether the torque converter clutch is engaging and disengaging
correctly.
The OSC functions for the TCC parameter allows the technician to choose the following:
zTCC - activates TCC OFF and ON.
z ON - turns TCC solenoid ON.
z OFF - turns TCC solenoid OFF.
OSC "TCC OFF" DRIVE MODE operates ONLY when:
zthe digital TR sensor is operational and no digital TR sensor DTCs are present.
z the vehicle speed sensor is operational and no VSS sensor DTCs are present. Klj . 5 ba
92003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

DIAGNOSIS AND TESTING
Diagnostic Trouble Code Charts
SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Diagnostic Trouble Code Chart
Five
Digit
DTC Component Description Condition Symptom Action
P0102
P0103
P1100
P1101 MAF MAF concerns MAF system has a
malfunction which
may cause a
transmission
concern. High or low EPC
pressure, incorrect
shift schedule.
Incorrect torque
converter clutch
engagement
scheduling.
Symptoms similar
to a throttle position
(TP) failure. REFER to the
Powertrain
Control/Emissions
Diagnosis (PC/ED)
manual.
P0112 IAT IAT indicates
125°C (257°F)
(grounded) Voltage drop
across IAT
exceeds scale set
for temperature
125°C (257°F). Incorrect EPC
pressure, either
high or low, results
in harsh or soft
shifts. REFER to
thePowertrain
Control/Emissions
Diagnosis (PC/ED)
manual.
P0113 IAT IAT indicates -
40°C (-
40°F)
(open circuit) Voltage drop
across IAT
exceeds scale set
for temperature -
40°C (-
40°F). Incorrect EPC
pressure, either
high or low, results
in harsh or soft
shifts. REFER to the
Powertrain
Control/Emissions
Diagnosis (PC/ED)
manual.
P0114 IAT IAT out of on-
board
diagnostic
range IAT temperature
higher or lower
than expected
during KOEO and
KOER. Rerun on-
board
diagnostic at
normal operating
temperature. REFER to the
Powertrain
Control/Emissions
Diagnosis (PC/ED)
manual.
P0117 ECT ECT indicates
125°C (257°F) Voltage drop
across ECT
exceeds scale set
for temperature
125°C (257°F)
(grounded). Torque converter
clutch will always
be off, resulting in
reduced fuel
economy. REFER to the
Powertrain
Control/Emissions
Diagnosis (PC/ED)
manual.
P0118 ECT ECT indicates
-
40°C (- 40°F) Voltage drop
across ECT
exceeds scale set
for temperature -
40°C (-
40°F)
(open circuit). Torque converter
clutch will always
be off, resulting in
reduced fuel
economy. REFER to the
Powertrain
Control/Emissions
Diagnosis (PC/ED)
manual.
P0122
P0123
P1120 TP TP concern PCM has detected
an error that may
cause a
transmission
concern. Harsh
engagements, firm
shift feel, abnormal
shift schedule,
torque converter
clutch does not
engage, torque
converter clutch
cycling. REFER to the
Powertrain
Control/Emissions
Diagnosis (PC/ED)
manual.
P0300- Electronic EI systems EI system has a Harsh REFER to the Klj . 1 ba
82003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

P0308
P0320
P0340
P1351-
P1364 Ignition (EI) concerns malfunction which
may cause a
transmission
concern. engagements and
shifts, late WOT
shifts, no torque
converter clutch
engagement. Powertrain
Control/Emissions
Diagnosis (PC/ED)
manual.
P0503
P0500
P1500
P1502 VSS Insufficient
VSS input PCM detected a
loss of vehicle
speed signal
during operation. Possible loss of
speedometer or
speedometer
fluctuation. REFER to the
Powertrain
Control/Emissions
Diagnosis (PC/ED)
manual.
P1702 Digital TR Intermittent
DTC codes
P0705 or
P0708 Refer to DTC
codes P0705 or
P0708 condition. Refer to DTC codes
P0705 or P0708
symptom. Go To Pinpoint
Test C .
P1704 Digital TR Digital TR
circuit reading
in between
gear position
during
KOEO/KOER Digital TR sensor
or shift cable
incorrectly
adjusted; or digital
TR circuit failure. Wrong commanded
EPC pressure.
Digital TR reading
the wrong gear
position. Go To Pinpoint
Test C .
P0705 Digital TR
sensor Digital TR
circuit failure Digital TR circuits,
indicating an
invalid pattern in
TR_D. Condition
caused by a short
to ground or an
open in TR4,
TR3A, TR2, and
or TR1 circuits.
This DTC cannot
be set by an
incorrectly
adjusted digital TR
sensor. Increase in EPC
pressure (harsh
shifts). Defaults to
(D) or D for all gear
positions. In (D)
position trans stuck
in D or manual 2. Go To Pinpoint
Test C .
P0707 Digital TR
sensor,
wiring, PCM Digital TR
sensor circuit
below
minimum
voltage Digital TR sensor,
circuit or PCM
shorted or
grounded. Increase in EPC
pressure. Go To Pinpoint
Test C .
P0708 Digital TR Digital TR
sensor circuit
TR3A open Digital TR sensor
circuit TR3A
reading 2.6v -
5.0v
(open circuit). This
DTC cannot be set
by an incorrectly
adjusted digital TR
sensor. Increase in EPC
pressure. Defaults
to (D)or D for all
gear ranges. Go To Pinpoint
Test C .
P1705 Digital TR
sensor Digital TR self
test was not
carried out in
PARK or
NEUTRAL Vehicle not in
PARK or
NEUTRAL during
on-
board
diagnostic. Rerun on-
board
diagnostic in PARK
or NEUTRAL. Go To Pinpoint
Test C .
P0712 TFT, wiring,
PCM 157°C (315°F)
indicated TFT
sensor circuit
grounded Voltage drop
across TFT sensor
exceeds scale set
for temperature of
157°C (315°F). Firm shift feel. Go To Pinpoint
Test B . Klj . 2 ba
82003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...