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Item Part
Number Description
1 — Engine control sensor wiring 42 pin electrical
connector
2 — 16 pin electrical connector
3 — Engine control jumper harness electrical connector
4 — RH heated oxygen sensor (HO2S) electrical
connector
5 — Transmission main control harness electrical
connector.
6 — Fuel injector electrical connectors
7 — Heated positive crankcase ventilation (PCV) valve
electrical connector.
8 — Radio ignition interference capacitor electrical
connector
9 — Ignition coil electrical connectors
10 — Generator battery electrical connector
11 — Generator field electrical connector
12 — Engine coolant temperature (ECT) sensor
electrical connector
13 — Fuel pressure sensor electrical connector
14 — Exhaust vacuum regulator (EVR) electrical
connector
15 — Idle air control (IAC) electrical connector
16 — EGR backpressure transducer electrical connector
17 — Power distribution box battery feed electrical wire
18 — Camshaft position (CMP) sensor electrical
connector Klj . 2 ba
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19 — 16 pin electrical connector
20 — 16 pin electrical connector
21 — Fuel injector electrical connectors
22 — Throttle position (TP) sensor electrical connector
23 — Ignition coil electrical connectors
24 — Radio ignition interference capacitor electrical
connector Klj . 3 ba
32003 Mustang Workshop Manual
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DIAGNOSIS AND TESTING
Fuel Charging and Controls
Refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
SECTION 303-
04D: Fuel Charging and Controls — Mach I 4.6L (4V) 2003 Mustang Workshop Manual Klj . 1 ba
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GENERAL PROCEDURES
Idle Speed Adjustment
Powertrain Control/Emissions Diagnosis (PC/ED) manual
SECTION 303-
04D: Fuel Charging and Controls — Mach I 4.6L (4V) 2003 Mustang Workshop Manual Klj . 1 ba
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Page 1989 of 4378

REMOVAL AND INSTALLATION
Throttle Body
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 can ignite. Failure to follow these instructions can result in personal injury.
CAUTION: The throttle body bore and plate area have a special coating and cannot be
cleaned.
1. Remove the air intake scoop bracket. For additional information, refer to Section 303 - 12 .
2. Remove the air cleaner outlet tube. For additional information, refer to Section 303 - 12 .
3. Disconnect the throttle position (TP) sensor electrical connector.
4. Disconnect the accelerator controls. zDisconnect the accelerator cable.
z Disconnect the speed control cable.
z Disconnect the return spring.
5. NOTE: Discard the throttle body gasket after removing the throttle body.
Remove the throttle body. zRemove the four bolts.
SECTION 303-
04D: Fuel Charging and Controls — Mach I 4.6L (4V) 2003 Mustang Workshop Manual Klj . 1 ba
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Page 1990 of 4378
Installation
1. NOTE: Install a new throttle body gasket.
To install, reverse the removal procedure. Klj . 2 ba
22003 Mustang Workshop Manual
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Page 1991 of 4378

REMOVAL AND INSTALLATION
Fuel Injectors
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 can ignite. Failure to follow these instructions can 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
can result in personal injury.
1. Remove the supply manifold. For additional information, refer to Supply Manifold in this section.
2. Remove the eight fuel injectors from the supply manifold.
Installation CAUTION: The retaining clip must be in the upper groove on the injector or the injector
can become loose.
1. NOTE: Inspect the two O- rings from each fuel injector. Install new O- rings as needed.
NOTE: Lubricate the new O- rings with clean engine oil.
To install, reverse the removal procedure.
SECTION 303-
04D: Fuel Charging and Controls — Mach I 4.6L (4V) 2003 Mustang Workshop Manual Klj . 1 ba
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Klj . 2 ba
22003 Mustang Workshop Manual
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