Ford Thunderbird Manual page 240

03-04A-6
DESCRIPTION AND OPERATION (Continued)
Item Number
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5
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6
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7
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8
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9
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10
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1 1
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12
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13
Fuel Pressure Relief Valve
The fuel pressure relief valve (9H32 1 ):
is used to relieve fuel pressure from the fuel delivery
•
system.
• is located on the fuel injection supply manifold
(9F792).
For fuel system pressure relief procedures, refer to
Section 1 o-o 1 .
Fuel Charging Wiring
The fuel charging wiring (90930):
connects the engine control sensor wiring ( 1 2A58 1)
•
to each fuel injector or other electronic engine
controls such as throttle position sensor (TP
sensor)(9B989) and idle air control valve (lAC
valve)(9F7 1 5).
receives fuel injector signals from the powertrain
•
control module (PCMX 1 2A650) and transfers the
signals to the fuel injectors (9F593).
The signals from the powertrain control module
determine the fuel injection sequence and duration
each fuel injector will stay open to allow fuel into the
combustion chambers.
Inertia Fuel Shutoff (IFS) Switch
The inertia fuel shutoff switch (IFS switch)(934 1 ):
is used in conjunction with an electric fuel pump
•
(9350).
�
shuts off the fuel pump in the event of a collision.
•
• consists of a steel ball held in place by a magnet.
Fuel Charging and Controls-3.8L
a
t
P r
Description
Diaphragm (Part of 9C968)
Lower Housing (Part of
9C968)
Fuel Outlet (Return) Tube
(Part of 9C968)
Fuel Inlet (Supply) Tube (Part
of 9C968)
0-Ring Grooves (Part of
9C968)
Mounting Plate (Part of
9C968)
Fuel Filler Screen (Part of
9C968)
Spring Seat (Part of 9C968)
Valve Assembly (Part of
9C968)
When a sharp impact occurs:
the ball breaks loose from the magnet, rolls up a
•
ramp and strikes a target plate which opens the
electrical contacts of the inertia fuel shutoff switch
and shuts off the fuel pump.
• and the inertia fuel shutoff switch is open, the inertia
fuel shutoff switch must be manually reset before
restarting the vehicle.
Fuel Pump Relay
The fuel pump relay ( 14N089) supplies power to the
fuel pump (9350) when the powertrain control module
(PCMX 1 2A650) grounds the relay during START and
engine running conditions.
A/C Clutch Control Relay
The A / C compressor clutch control relay ( 14N089)
improves idle smoothness after engine start-up and
also improves acceleration performance. The A I C is
cut off for approximately five seconds:
just after the engine is started.
•
when the throttle position sensor (TP
•
sensorX9B989) indicates a full throttle condition.
03-04A·6
A20827-A
1997 Thunderbird. Cougar July 1 996