2003 FORD MUSTANG fuel

SPECIFICATIONS
SECTION 303-
14: Electronic Engine Controls 2003 Mustang Workshop Manual General Specifications
Item Specification
Lubricants
Super premium SAE 5W-
20 Engine Oil XO-5W20-DSP WSS-
M2C914- A Penetrating and Lock Lubricant E8AZ-19A501-
B N/A
Pipe Sealant with Teflon D8AZ-19554-
A WSK-
M26350- A2
Torque Specifications Description Nm lb-
ft lb-
in Cylinder head temperature (CHT) sensor —
3.8L 10 — 89
Engine coolant temperature (ECT) sensor —
4.6L (2V) 20 — 15
Engine coolant temperature (ECT) sensor —
4.6L (4V) 24 18 —
Heated oxygen sensors (HO2S) 41 30 —
Catalyst monitor sensors 41 30 —
Crankshaft position (CKP) sensor bolts —
3.8L 6 — 53
Crankshaft position (CKP) sensor bolts —
4.6L 10 — 89
Power steering reservoir bolts 10 — 89
Camshaft position (CMP) sensor bolt —
4.6L 10 — 89
PCM connector to module bolt 6 — 53
Idle air control (IAC) valve bolts 10 — 89
Camshaft synchronizer housing bolt 25 18 —
Throttle position (TP) sensor screws 3 — 27
Fuel pressure sensor bolts 4 — 35
Air intake scoop bolts 25 18 —
Air intake scoop bracket bolt 25 18 —
Air intake scoop bracket nuts 25 18 —
Air intake scoop bracket throttle body nut 9 — 80
Exhaust gas recirculation (EGR) vacuum regulator solenoid bolts 10 — 89 Klj . 1 ba
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The camshaft position sensor:
zsends the powertrain control module a signal indicating camshaft position, used for fuel
synchronization.
The crankshaft position sensor:
zsends the powertrain control module a signal indicating crankshaft position.
z is essential for calculating spark timing.
The mass air flow sensor:
zsends the powertrain control module a signal indicating mass air flow rate of air entering the
engine.
The intake air temperature sensor:
zsends the powertrain control module a signal indicating the temperature of the air entering the
engine.
The heated oxygen sensor:
zhas the ability to create a voltage signal depending on exhaust oxygen content.
z provides feedback information to the powertrain control module used to calculate fuel delivery.
The rear catalyst monitor sensor:
zmonitors oxygen content after the oxygen flows through the catalytic converter.
z provides a voltage to the powertrain control module used to calculate catalytic converter
integrity.
The wheel speed sensor:
zsends a signal to the powertrain control module indicating wheel speed. Klj . 2 ba
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REMOVAL AND INSTALLATION
Intake Manifold Runner Control (IMRC) Actuator —
3.8L
Removal and Installation 1. Disconnect the battery ground cable. For additional information, refer to Section 414 - 01 .
2. Drain the cooling system. For additional information, refer to Section 303 - 03A .
3. Remove the upper intake manifold. For additional information, refer to Section 303 - 01A .
4. Remove the fuel injector supply manifold. For additional information, refer to Section 303 - 04A .
5. Remove the coolant bypass tube. For additional information, refer to Section 303 - 03A .
6. Remove the bolt and heater water inlet tube at the back of the lower intake.
7. Remove the two stud bolts and one bolt. Position the actuator aside.
8. Disconnect the linkage and remove the actuator.
SECTION 303-
14: Electronic Engine Controls 2003 Mustang Workshop Manual Klj . 1 ba
22003 Mustang Workshop Manual
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REMOVAL AND INSTALLATION
Fuel Pressure Sensor
Removal
WARNING: Do not smoke or carry lighted tobacco or open flame of any type when
working on or near any fuel related components. Highly flammable mixtures are always present
and may be ignited. Failure to follow these instructions may result in personal injury.
WARNING: Fuel in the fuel system remains under high pressure even when the engine is
not running. Before working on or disconnecting any of the fuel lines or fuel system
components, the fuel system pressure must be relieved. Failure to follow these instructions
may result in personal injury.
Mach I
1. Remove the air intake scoop. For additional information, refer to Section 303 - 12 .
All engines 2. Relieve the fuel pressure. For additional information, refer to Section 310 - 00 .
3. NOTE: The 4.6L (4V) Cobra engine is shown, the other engines are similar.
Disconnect the connector and the vacuum line. 4. Remove the bolts and the sensor. SECTION 303-
14: Electronic Engine Controls 2003 Mustang Workshop Manual Material
Item Specification
Super Premium SAE 5W-20
Motor Oil
XO- 5W20- DSP or equivalent WSS-
M2C914-
A Klj . 1 ba
22003 Mustang Workshop Manual
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z
Apply and release of the torque converter clutch.
z Maximum fuel economy during normal operation.
Second Position
This position provides:
zSecond gear start and hold.
z The torque converter clutch can apply and release.
z Improved traction and engine braking on slippery roads.
z Engine braking for descending steep grades.
First Position
If this position is selected at normal road speeds, the transmission will shift into second gear, then into
first when the vehicle reaches a speed below approximately 45 km/h (28 mph).
This position provides:
zFirst gear operation only.
z Engine braking for descending steep grades. Klj . 2 ba
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DESCRIPTION AND OPERATION
Transmission Electronic Control System
The powertrain control module (PCM) and its input/output network control the following transmission
operations:
zShift timing
z Line pressure (shift feel)
z Torque converter clutch
The transmission control is separate from the engine control strategy in the PCM, although some of
the input signals are shared. When determining the best operating strategy for transmission operation,
the PCM uses input information from certain engine- related and driver-demand related sensors and
switches.
In addition, the PCM receives input signals from certain transmission- related sensors and switches.
The PCM also uses these signals when determining transmission operating strategy.
Using all of these input signals, the PCM can determine when the time and conditions are right for a
shift, or when to apply or release the torque converter clutch (TCC). It will also determine the best line
pressure needed to optimize shift feel. To accomplish this, the PCM uses hydraulic solenoids to control
transmission operation.
The following provides a brief description of each of the sensors and actuators used to control
transmission operation.
Powertrain Control Module (PCM)
The operation of the transmission is controlled by the powertrain control module (PCM). Many input
sensors provide information to the PCM. The PCM then controls actuators which determine
transmission operation.
Air Conditioning (A/C) Clutch
An electromagnetic clutch is energized when the clutch cycling pressure switch closes. The switch is
located on the suction accumulator/drier. The closing of the switch completes the circuit to the clutch
and draws it into engagement with the compressor driveshaft. When the A/C clutch is engaged,
electronic pressure control (EPC) is adjusted by the PCM to compensate for additional load on the
engine.
Brake Pedal Position (BPP) Switch
The brake pedal position (BPP) switch tells the PCM when the brakes are applied. The torque
converter clutch disengages when the brakes are applied. The BPP switch closes when the brakes are
applied and opens when they are released.
Engine Coolant Temperature (ECT) Sensor
The engine coolant temperature (ECT) sensor detects temperature of engine coolant and supplies the
information to the powertrain control module. The ECT sensor is used to control torque converter
clutch (TCC) operation. The ECT is installed in the heater outlet fitting or cooling passage on the
engine. For engine control applications, the ECT signal is used to modify ignition timing, EGR flow and
air- to-fuel ratio as a function of engine coolant temperature.
SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Klj . 1 ba
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Ignition Coil —
Coil On Plug
The engine uses eight separate coil per plug units. Each coil per plug unit is controlled by the
powertrain control module (PCM).
Each coil per plug unit is mounted directly above each spark plug and activates its own spark plug in
the correct sequence as controlled by the PCM.
Refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual for additional information on the
ignition system.
Intake Air Temperature (IAT) Sensor
The intake air temperature (IAT) sensor provides the sequential fuel injection (SFI) system mixture
temperature information. The IAT sensor is used both as a density corrector for air flow calculation and
to proportion cold enrichment fuel flow. The IAT sensor is installed in the air cleaner inlet tube. The IAT
sensor is also used in determining EPC pressures.
Mass Air Flow (MAF) Sensor
The mass air flow (MAF) sensor measures the mass of air flowing into the engine. The MAF sensor
output signal is used by the powertrain control module to calculate injector pulse width. For
transmission strategies, the mass air flow sensor is used to regulate EPC, shift and torque converter
clutch scheduling.
Transmission Control Switch (TCS) and Transmission Control Indicator Lamp (TCIL)
The transmission control switch (TCS) is a momentary contact switch. When the switch is pressed, a
signal is sent to the PCM to allow automatic shifts from first through fourth gears or first through third
gears only. The PCM energizes the transmission control indicator lamp (TCIL) when the switch is off.
The TCIL indicates overdrive cancel mode activated (lamp on). When the TCIL is flashing, it indicates
electronic pressure control (EPC) circuit shorted or a monitored sensor failure.
Throttle Position (TP) Sensor
The throttle position (TP) sensor is a potentiometer mounted on the throttle body. The TP sensor
detects the position of the throttle plate and sends this information to the PCM. The TP sensor is used
for shift scheduling, electronic pressure control (EPC) and TCC control.
Digital Transmission Range (TR) Sensor
The digital transmission range (TR) sensor is located on the outside of the transmission at the manual
lever. The digital sensor completes the start circuit in PARK and NEUTRAL, and the back- up lamp
circuit in REVERSE. The digital sensor also opens/closes a set of four switches that are monitored by
the PCM to determine the position of the manual lever (P, R, N, D, 2, 1).
Output Shaft Speed (OSS) Sensor
The output shaft speed (OSS) sensor is a magnetic pickup, located at the output shaft ring gear, that
sends a signal to the powertrain control module (PCM) to indicate transmission output shaft speed.
The OSS sensor is used for torque converter clutch (TCC) control, shift scheduling and to determine
electronic pressure control (EPC).
Electronic Pressure Control (EPC) Solenoid
The EPC solenoid regulates transmission pressure. EPC valve pressure is used to control line
pressure.
Torque Converter Clutch (TCC) Solenoid Klj . 2 ba
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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
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