2003 FORD MUSTANG wiring

Control/Emissions Diagnosis (PC/ED) manual will aid in diagnosing non-
transmission electronic
components.
Before Pinpoint Tests
NOTE: Prior to entering pinpoint tests, check the PCM wiring harness for tight connections, bent or
broken pins, corrosion, loose wires, correct routing, correct seals and their condition. Check the PCM,
sensors and actuators for damage. Refer to the Powertrain Control/Emissions Diagnosis (PC/ED)
manual.
NOTE: If a concern still exists after electrical diagnosis has been carried out, refer to Diagnosis By Symptom in this section.
If DTCs appear while carrying out the on- board diagnostics, refer to the Diagnostic Trouble Code Charts for the appropriate repair procedure. Prior to entering pinpoint tests, refer to any TSBs and
OASIS messages for transmission concerns. Klj . 2 ba
22003 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~ ...

P0713 TFT, wiring,
PCM -40°C (-
40°F)
indicated TFT
sensor circuit
open Voltage drop
across TFT sensor
exceeds scale set
for temperature -
40°C (-
40°F). Firm shift feel. Go To Pinpoint
Test B .
P1710 TFT TFT sensor in
range
malfunction PCM detected
TFT not changing. Firm shift, TCIL
flashing, increase in
EPC. Go To Pinpoint
Test B .
P1711 TFT TFT out of on-
board
diagnostic
range Transmission not
at operating
temperature
during on-
board
diagnostic. Warm vehicle to
normal operating
temperature. Go To Pinpoint
Test B .
P1713 TFT wiring
PCM TFT
continually
reading cold TFT sensor in
range low failure. Firm shift feel.
Substitute ECT for
TFT Go To Pinpoint
Test B .
P1718 TFT, wiring,
PCM TFT
continually
reading hot TFT sensor in
range high failure. Firm shift feel.
Substitute ECT for
TFT Go To Pinpoint
Test B .
P1783 TFT Transmission
over
temperature
condition
indicated Transmission fluid
temperature
exceeded 127°C
(270°F). Increase in EPC
pressure. Go To Pinpoint
Test B .
P0720 OSS Insufficient
input from
output shaft
speed sensor PCM detected a
loss of OSS signal
during operation. Harsh shifts,
abnormal shift
schedule, no torque
converter clutch
activation. Go To Pinpoint
Test E .
P0721 OSS OSS sensor
signal noisy PCM has detected
an erratic OSS
signal. Harsh shifts,
abnormal shift
schedule, no torque
converter clutch
engagement. Go To Pinpoint
Test E .
P0722 OSS wiring Insufficient
input from
OSS PCM has detected
a loss of OSS
signal. Harsh shifts,
abnormal shift
schedule, no torque
converter clutch
engagement. Go To Pinpoint
Test E .
P0741
** TCC,
internal
components TCC slippage
detected The PCM picked
up an excessive
amount of
slippage during
normal vehicle
operation. TCC
slippage/erratic or
no torque converter
clutch operation.
Flashing
Transmission
Control Indicator
Lamp (TCIL). GO to
Diagnosis By Symptom .
P0743
* TCC, wiring,
PCM TCC solenoid
circuit failure
during on-
board
diagnostic TCC solenoid
circuit fails to
provide voltage
drop across
solenoid. Circuit
open or shorted or
PCM driver failure
during on-
board
diagnostic. Short circuit: engine
stalls in second
(OD, 2 range) at
low idle speeds with
brake applied.
Open circuit: torque
converter clutch
never engages. Go To Pinpoint
Test A .
P1746 EPC, wiring, Shorted PCM Voltage through Open circuit causes Go To Pinpoint Klj . 3 ba
82003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

*
PCM output driver EPC solenoid is
checked. An error
will be noted if
tolerance is
exceeded. maximum EPC
pressure, harsh
engagements and
shifts. Test D .
P1747
* EPC, wiring,
PCM EPC solenoid
circuit failure,
shorted circuit
or output
driver Voltage through
EPC solenoid is
checked. An error
will be noted if
tolerance is
exceeded. Short circuit causes
minimum EPC
pressure (minimum
capacity) and limits
engine torque
(alternate firm). Go To Pinpoint
Test D .
P1760 EPC, wiring,
PCM EPC solenoid
circuit failure,
shorted circuit
or output
driver PCM detected a
loss of EPC during
operation. Unexpected
reduction in engine
torque. Go To Pinpoint
Test D .
P0750
a SSA, wiring,
PCM SSA solenoid
circuit failure SSA circuit failed
to provide voltage
drop across
solenoid. Circuit
open or shorted or
PCM driver failure
during on-
board
diagnostic. Incorrect gear
selection depending
on condition mode
and manual lever
position. See
Solenoid On/Off
Chart. Go To Pinpoint
Test A .
P0753 SSA, wiring,
PCM SSA electrical
circuit failure SSA circuit fails to
provide voltage
drop across
solenoid. Circuit
open or shorted or
PCM driver failure
during on-
board
diagnostic. Incorrect gear
depending on
condition mode and
manual lever
position. See
Solenoid Off/On
Chart. Flashing
Transmission
Control Indicator
Lamp (TCIL). Go To Pinpoint
Test A .
P0751 SSA, wiring,
PCM Shift solenoid
A functional
failure Mechanical or
hydraulic failure of
the shift solenoid. Incorrect gear
selection depending
on failure mode
manual lever
position. REFER to Solenoid
Operation Chart.
Go To Pinpoint
Test A .
P0781
b SSA or
internal parts 1-
2 shift error Engine rpm drop
not detected when
1-
2 shift was
commanded by
PCM. Incorrect gear
selection depending
on failure or mode
and manual lever
position. Shift errors
may also be due to
other internal
transmission
concerns (stuck
valves, damaged
friction material). REFER to Solenoid
Operation Chart.
Go To Pinpoint
Test A .
P1714 SSA,
internal
components SSA
malfunction Mechanical failure
of the solenoid
detected. Incorrect gear
selection depending
on condition, mode
and manual lever
position. See
Solenoid Operation
Chart. Go To Pinpoint
Test F .
P0755
a SSB, wiring,
PCM SSB solenoid
circuit failure SSB circuit fails to
provide voltage Incorrect gear
selection depending Go To Pinpoint
Test A . Klj . 4 ba
82003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

drop across
solenoid. Circuit
open or shorted or
PCM driver failure
during on-
board
diagnostic. on condition mode
and manual lever
position. See
Solenoid On/Off
Chart.
P0756 SSB Shift solenoid
B functional
failure Mechanical or
hydraulic failure of
the shift solenoid. Incorrect gear
selection depending
on failure mode and
manual lever
position. REFER to Solenoid
Operation Chart.
Go To Pinpoint
Test A .
P1715 SSB SSB
malfunction Mechanical failure
of the solenoid
detected. Incorrect gear
selection depending
on condition, mode
and manual lever
position. See
Solenoid Operation
Chart. Go To Pinpoint
Test F .
P0758 SSB, wiring,
PCM SSB electrical
circuit failure SSB circuit fails to
provide voltage
drop across
solenoid. Circuit
open or shorted or
PCM driver failure
during on-
board
diagnostic. Incorrect gear
depending on
condition mode and
manual lever
position. See
Solenoid Off/On
Chart. Flashing
Transmission
Control Indicator
Lamp (TCIL). Go To Pinpoint
Test A .
P0782
b SSA, SSB or
internal parts 2-
3 shift error Engine rpm drop
not detected when
2-
3 shift was
commanded by
PCM. Incorrect gear
selection depending
on failure or mode
and manual lever
position. Shift errors
may also be due to
other internal
transmission
concerns (stuck
valves, damaged
friction material). REFER to Solenoid
Operation Chart.
Go To Pinpoint
Test A .
P0783
b SSA, SSB or
internal parts 3-
4 shift error Engine rpm drop
not detected when
3-
4 shift was
commanded by
PCM. Incorrect gear
selection depending
on failure or mode
and manual lever
position. Shift errors
may also be due to
other internal
transmission
concerns (stuck
valves, damaged
friction material). REFER to Solenoid
Operation Chart.
Go To Pinpoint
Test A .
P1116 ECT ECT out of on-
board
diagnostic
range ECT 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.
P1124 TP TP voltage
high/low for
on-
board
diagnostic TP was not in the
correct position for
on-
board
diagnostic. Rerun at
appropriate throttle
position per
application. REFER to the
Powertrain
Control/Emissions
Diagnosis (PC/ED) Klj . 5 ba
82003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

manual.
P1460 A/C A/C clutch
cycling
pressure
switch error A/C or defrost on
condition may
result from A/C
clutch being on
during on-
board
diagnostic. DTC set during on-
board diagnostic,
repeat with A/C off.
Failed on, EPC
pressure slightly
low with A/C OFF. REFER to the
Powertrain
Control/Emissions
Diagnosis (PC/ED)
manual.
P1636 PCM PCM detected
internal error — — REFER to the
Powertrain
Control/Emissions
Diagnosis (PC/ED)
manual.
P1703 BPP BPP switch
circuit failed. Brake ON/OFF
circuit failure. Failed ON or not
connected —
torque converter
clutch will not
engage at less than
1/3 throttle. Failed
OFF or not
connected —
torque converter
clutch will not
disengage when
brake is applied. REFER to the
Powertrain
Control/Emissions
Diagnosis (PC/ED)
manual.
P1703 BPP Brake not
actuated
during on-
board
diagnostic Brake not cycled
during KOER. Failed OFF or not
connected —
torque converter
clutch will not
engage at less than
1/3 throttle. Failed
OFF or not
connected —
torque converter
clutch will not
disengage when
brake is applied. REFER to the
Powertrain
Control/Emissions
Diagnosis (PC/ED)
manual.
P0740 TCC, wiring,
PCM TCC electrical
circuit failure TCC circuit fails to
provide voltage
drop across
solenoid. Circuit
open or shorted or
PCM driver failed
during on-
board
diagnostic. Short circuit: engine
stalls in second
(OD, 2 range) at
low idle speeds with
brake applied.
Open circuit: torque
converter clutch
never engages.
Flashing
Transmission
Control Indicator
Lamp (TCIL). Go To Pinpoint
Test A .
P1740 TCC TCC
malfunction Mechanical failure
of the solenoid
detected. Failed ON —
Engine stalls in 2nd
(O/D, Manual 2
ranges) at low idle
speeds with brake
applied. Failed OFF
—
Torque
Converter never
applies. Go To Pinpoint
Test F .
P1741
b TCC,
internal Excessive
torque Excessive
variations in slip Engine rpm
oscillation is Go To Pinpoint
Test A . Klj . 6 ba
82003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

Any time an electrical connector or solenoid body is disconnected, inspect the connector for pin
condition, corrosion and contamination. Also inspect the connector seal for damage. Clean, repair or
install a new connector as required.
Shift Solenoids Pre-Diagnosis
Use the following shift solenoid operation information when carrying out Pinpoint Test A.
a When a manual pull- in occurs above a calibrated speed the transmission will downshift from the
higher gear until the vehicle speed drops below this calibrated speed.
EC = Electronically controlled.
HD = Hydraulically disabled.
Shift Solenoid Failure Mode Chart "Always Off"
Failed off due to powertrain control module and or vehicle wiring concerns, shift solenoid electrically or
hydraulically stuck off. Solenoid Operation Chart Gear Lever Position PCM Commanded Gear Solenoids
SSA SSB TCC
P/R/N 1 ON OFF HD
(D) 1 ON OFF HD
(D) 2 OFF OFF EC
(D) 3 OFF ON EC
(D) 4 ON ON EC
(D)
w/OD OFF
1 1 ON OFF HD
2 2 OFF OFF EC
3 3 OFF ON EC
Manual 2 2 OFF OFF EC
Manual 1 1 ON OFF HD
1
a 2 OFF OFF EC
SSA ALWAYS OFF: Gear Lever Position
(D) 2 1
PCM Gear
Commanded Actual Gear
Obtained
1 2 2 2
2 2 2 2
3 3
2
a 2
a 4 3
2
a 2
a Klj . 2 ba
222003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...

a
No engine braking.
Shift Solenoid Failure Mode Chart "Always On"
Failed on due to powertrain control module and or vehicle wiring concerns, shift solenoid electrically or
hydraulically stuck on.
a No engine braking.
a No engine braking.
PINPOINT TEST A: SHIFT AND TORQUE CONVERTER CLUTCH
SOLENOIDS SSB ALWAYS OFF: Gear Lever Position
(D) 2 1
PCM Gear
Commanded Actual Gear
Obtained
1 1 1 1
2 2 2 2
3 2 2 2
4 1 1 1
SSA ALWAYS ON: Gear Lever Position
(D) 2 1
PCM Gear
Commanded Actual Gear
Obtained
1 1 1 1
2 1 1 1
3 4
2
a 2
a 4 4
2
a 2
a SSB ALWAYS ON: Gear Lever Position
(D) 2 1
PCM Gear
Commanded Actual Gear
Obtained
1 4
2
a 2
a 2 3
2
a 2
a 3 3
2
a 2
a 4 4
2
a 2
a Test Step Result / Action to Take
NOTE:
Read and record all DTCs. All digital TR Sensor and VSS DTCs must be repaired before
entering Output State Control (OSC). NOTE:
Refer to the Transmission Internal Harness illustration preceding these pinpoint tests. Klj . 3 ba
222003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2748/S3B~us~en~ ...