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Page 2071 of 4378

FORD MUSTANG 2003 User Guide DESCRIPTION AND OPERATION
Engine Ignition
Eight separate ignition coils (12029):
�zare mounted directly above each spark plug (12405).
�z are controlled by the powertrain control module (PCM) for

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FORD MUSTANG 2003 User Guide SPECIFICATIONS
a
MERCON® V is not interchangeable at this time with the current MERCON® fluids. Check the
transmission fluid level indicator to determine the correct fluid and refer to the Worksh

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FORD MUSTANG 2003 User Guide DIAGNOSIS AND TESTING
Output State Control (OSC) Mode
Output State Control (OSC) allows the technician to take control of certain parameters to function the
transmission. For example, OSC allows th

DIAGNOSIS AND TESTING
Output State Control (OSC) Mode
Output State Control (OSC) allows the technician to take control of certain parameters to function the
transmission. For example, OSC allows the technician to shift the transmission only when he/she
commands a gear change. If the technician commands 1st gear in OSC, the transmission will remain
in 1st gear until the technician commands the next gear. Another example, the technician can
command a shift solenoid to turn on or off when carrying out an electrical circuit check. OSC has two
modes of operation for transmission, the BENCH MODE and the DRIVE MODE. Each
mode/parameter has a unique set of vehicle operating requirements that the technician is required to
meet before being allowed to operate OSC.
NOTE:
To operate OSC the digital transmission range (TR) sensor must be operational. No Diagnostic
Trouble Codes (DTCs) related to the digital TR sensor can be present.
To operate OSC the vehicle speed source must be operational. No diagnostic codes (DTCs) related to
this source can be present. The vehicle speed source can vary depending on vehicle configuration.
Technicians should verify which input source is applicable for their vehicle application. The following
are potential vehicle speed sources:
„anti- lock braking system (ABS)
„ output shaft speed (OSS) sensor
„ vehicle speed sensor
z The vehicle requirements MUST BE MET when SENDING the OSC value. Refer to individual
test modes for vehicle requirements.
z If the vehicle requirements are NOT MET when SENDING the OSC value, an ERROR
MESSAGE will appear. When the ERROR MESSAGE is received, OSC is aborted and must be
restarted.
z If AFTER SENDING an OSC value, and the vehicle requirements are no longer met, the PCM
will cancel the OSC value and NO ERROR message will appear. Once the vehicle requirements
are met again, the PCM will automatically SEND the previous OSC value without any additional
actions required by the service technician.
z The OSC value XXX may be sent anytime to cancel OSC.
Output State Control (OSC) Procedures
zCarry out visual inspection and vehicle preparation as required.
z Select "Vehicle and Engine Selection" menu.
z Select appropriate vehicle and engine.
z Select "Diagnostic Data Link."
z Select "Powertrain Control Module."
z Select "Output Test Mode."
z Select "KOEO On- Demand Self Test and KOER On- Demand Self Tests."
z Carry out test and record DTCs.
z Repair all NON- Transmission DTCs.
z Repair all digital TR Sensor DTCs.
SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Klj . 1 ba
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FORD MUSTANG 2003 User Guide IN-
VEHICLE REPAIR
Fluid Pan, Gasket and Filter
1. Normal maintenance requires periodic automatic transmission fluid changes. If a major repair, such as a clutch, band, bearing, etc., is required,

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FORD MUSTANG 2003 User Guide GENERAL PROCEDURES
Air Conditioning (A/C) System Flushing
WARNING: Use extreme care and observe all safety and service precautions related to the
use of refrigerants.
WARNING: Due to refrigerant

GENERAL PROCEDURES
Air Conditioning (A/C) System Flushing
WARNING: Use extreme care and observe all safety and service precautions related to the
use of refrigerants.
WARNING: Due to refrigerant hazards, always wear safety goggles and non- penetrable
gloves when working on or flushing A/C systems.
CAUTION: An A/C refrigerant analyzer must be used before the recovery of any vehicle's
A/C refrigerant. Failure to do so puts the shop's bulk refrigerant at risk of contamination. If the
vehicle's A/C refrigerant is contaminated, refer the customer to the service facility that carried
out the last A/C service. If the customer wishes to pay the additional cost, use the A/C recovery
equipment that is designated for recovering contaminated A/C refrigerant. All contaminated
A/C refrigerant must be disposed of as hazardous waste. For all equipment, follow the
equipment manufacturer's procedures and instructions.
CAUTION: Suction accumulator/drier, muffler, hoses, thermal expansion valve, and fixed
orifice tube should be removed when flushing the A/C system. Internal plumbing of these
devices makes it impossible to correctly remove any residual- flushing agent. Except for the
hoses, these components are typically discarded after A/C system contamination. Hoses can
normally be reused unless they are clogged with foreign material. The 3.785 liters (1 gallon) of
A/C Systems Flushing Solvent F4AZ-19579- A and FL1-A filter used in A/C Flush and Purge
Machine 219- 00022 are intended for use on one vehicle only. They may be used to flush both
the A/C condenser core and the A/C evaporator core on an individual vehicle, but under no
circumstances should they be used on more than one vehicle.
1. NOTE: Prior to using the A/C Flush and Purge Machine 219- 00022 for the first time, review the
operating instructions.
NOTE: Only the A/C Flush and Purge Machine kit 219- 00023, which includes A/C Flush and
Purge Machine 219- 00022, A/C Flush and Purge Fitting Kit 219- 00024, and the Ford Part
number F4AZ-19579- A A/C Systems Flushing Solvent, is approved for use on Ford vehicles. No
other flushing device or solvent is approved for flushing heat exchangers. Use of any other
flusher or solvent may cause damage to the A/C system and the flushing unit.
SECTION 412-
00: Climate Control System - General Information 2003 Mustang Workshop Manual Special Tool(s)
A/C Flush and Purge Machine
219-
00022 (part of 219- 00023)
or equivalent A/C Flush and Purge Fitting Kit
219-
00024 (part of 219- 00023)
or equivalent Klj . 1 ba
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FORD MUSTANG 2003 User Guide Ford Motor Company has approved a procedure to provide technicians with a non-
CFC method
of flushing contaminated A/C system heat exchangers, A/C evaporator core, and A/C
condenser core. The proced

Ford Motor Company has approved a procedure to provide technicians with a non-
CFC method
of flushing contaminated A/C system heat exchangers, A/C evaporator core, and A/C
condenser core. The procedure allows the specific components to be cleaned and flushed while
installed in their normal in- vehicle location. The types of contamination flushed include particle
matter that results from A/C compressor or desiccant failure within the suction accumulator/drier
and gummy residue that can form when refrigerant oil is overheated during A/C compressor
seizure. The flushing process is a two- step procedure that involves the use of an A/C Flush and
Purge Machine 219- 00022 to:
z Circulate the flushing solvent through the heat exchanger in the reverse direction of
normal refrigerant flow (back- flushing). Particulate matter picked up during flushing is
filtered from the returning solvent before the solvent is returned to the reservoir for
continued circulation.
z Remove the flushing solvent from the heat exchanger. In this step of the procedure,
pressurized air 621- 862 kPa (90-125 psi) is used to push and evaporate any remaining
flush solvent from the heat exchanger.
2. Discharge the A/C system. Observe all safety precautions. For additional information, refer to the procedure in this section.
3. Disconnect the refrigerant lines from the heat exchanger(s) to be flushed.
4. Connect the A/C Flush and Purge Machine 219- 00022 and A/C Flush and Purge Fitting Kit 219-
00024 to the heat exchanger to be flushed. Do not flush through the A/C evaporator core orifice,
mufflers or hoses. Internal plumbing and material make- up of these components make it
impossible to correctly remove foreign material or residual flushing solvent.
5. Use 3.785 liters (one gallon) of A/C Systems Flushing Solvent part number F4AZ-19579- A to
flush the heat exchanger for a minimum of 15 minutes. The flush solvent may be used for one
or both heat exchangers in the A/C system. However, the flush solvent is intended for one
vehicle only. The filter used on the flushing unit is also intended for use on one vehicle only.
6. Flush the component for a minimum of 15 minutes.
7. Apply 621- 862 kPa (90-125 psi) pressurized air to the component for a minimum of 30 minutes.
The 30- minute purge time is required to force and evaporate all residual solvent from the A/C
system component. Failure to successfully remove all residual solvent within the component
can result in system damage when reconnected and operated. Dispose of the used flush
solvent and filter in accordance with local, state and federal emissions.
8. NOTE: A/C system filtering as described in this section is optional if system flushing is carried
out. However, the filter kit use is recommended after flushing if the A/C system contamination is
extensive.
Install a new A/C evaporator core orifice in any vehicle being serviced for A/C compressor or
desiccant failure.
9. Install new refrigerant hoses if clogged with foreign material.
10. Reconnect the heat exchanger being serviced.
11. Add additional refrigerant oil as required. For additional information, refer to the procedure in this section.
12. Evacuate, leak test and charge the A/C system. For additional information, refer to the procedure in this section.
13. Check the system for normal operation. Klj . 2 ba
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FORD MUSTANG 2003 User Guide DIAGNOSIS AND TESTING
Interior Lighting
Refer to Wiring Diagrams Cell
111 , Remote Control Alarm and Lock System for schematic and
connector information.
Refer to Wiring Diagrams Cell 59 , Gen

DIAGNOSIS AND TESTING
Interior Lighting
Refer to Wiring Diagrams Cell
111 , Remote Control Alarm and Lock System for schematic and
connector information.
Refer to Wiring Diagrams Cell 59 , Generic Electronic Module for schematic and connector
information.
Refer to Wiring Diagrams Cell 89 , Courtesy Lamps for schematic and connector information.
Principles of Operation
Battery Saver
The battery saver feature provides automatic shut- off of power to demand and courtesy lamp circuitry.
When the generic electronic module (GEM) detects the ignition switch circuits are in the key OFF or
removed ignition key positions, power will be disabled after individual time- out periods of 30 minutes
for the demand lamps, and 10 minutes for the courtesy lamps. However, the time- out period for the
courtesy lamps changes to 30 minutes when the GEM detects that the luggage compartment lid is ajar
by means of the luggage compartment lid ajar circuit, or if the dome lamp is switched on by means of
the dome lamp circuit. When the GEM detects that the ignition switch is in the RUN, ACC, or START
positions, the battery saver feature is disabled.
The battery saver timer for the demand lamps is reset when the GEM detects that the ignition switch is
in the OFF or key out positions or when the GEM detects any one of the following conditions:
zthe driver or passenger door becomes ajar, as detected by the door ajar circuit
z the luggage compartment lid becomes ajar, as detected by the luggage compartment lid ajar
circuit
z the dome lamp switch is activated, as detected by the dome lamp switch circuit
The battery saver timer for the courtesy lamps is reset when the GEM detects that the ignition switch is
in the OFF or key out positions or when the GEM detects the driver or passenger door becomes ajar SECTION 417-
02: Interior Lighting 2003 Mustang Workshop Manual Special Tool(s)
73 Digital Multimeter or
equivalent
105-
R0051 Worldwide Diagnostic System
(WDS)
418-
F224,
New Generation STAR (NGS)
Tester
418- F052, or equivalent scan
tool Klj . 1 ba
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