2003 FORD MUSTANG key

Pinpoint Tests
PINPOINT TEST A: THE SPEED CONTROL IS INOPERATIVE
Test Step Result / Action to Take
A1 CHECK THE SPEED CONTROL SERVO VOLTAGE AND
GROUND z
Key in OFF position.
z Disconnect: Speed Control Servo C122.
z Key in ON position.
z Measure the voltage between speed control servo C122 Pin 7,
Circuit 294 (WH/LB), harness side and speed control servo
C122 Pin 10, Circuit 1205 (BK), harness side.
z Is voltage greater than 10 volts? Yes
GO to
A3 .
No
GO to A2 .
A2 CHECK THE CIRCUIT 1205 (BK) FOR AN OPEN
z
Key in OFF position.
z Measure the resistance between speed control servo C122 Pin
10, Circuit 1205 (BK), harness side and ground.
z Is the resistance less than 5 ohms? Yes
REPAIR Circuit 294
(WH/LB). TEST the
system for normal
operation.
No
REPAIR Circuit 1205
(BK). TEST the system
for normal operation.
A3 CHECK DEACTIVATOR SWITCH CIRCUITRY
z
Measure the voltage between speed control servo C122 Pin 9,
Circuit 636 (OG), harness side and speed control servo C122
Pin 10, Circuit 1205 (BK), harness side. Yes
GO to
A6 .
No
GO to A4 . Klj . 4 ba
132003 Mustang Workshop Manual
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z
Is the voltage greater than 10 volts? A7 CHECK CIRCUIT 151 (LB/BK) FOR AN OPEN
z
Disconnect: Air Bag Sliding Contact C218a.
z Measure the resistance between speed control servo C122 Pin
5, Circuit 151 (LB/BK), harness side and air bag sliding contact
C218a Pin 4, Circuit 151 (LB/BK), harness side.
z Is the resistance less than 5 ohms? Yes
GO to
A8 .
No
REPAIR the circuit.
TEST the system for
normal operation. A8 CHECK THE AIR BAG SLIDING CONTACT
z
Remove the air bag; REFER to Section 501 - 20B .
z Disconnect: Speed Control Actuator Switch.
z Measure the resistance between bottom of air bag sliding
contact Pin 1 (component side) and top of air bag sliding
contact Pin 3 (component side).
z Is the resistance less than 5 ohms? Yes
INSTALL a new speed
control actuator switch;
REFER to
Switch —
Speed Control
Actuator . TEST the
system for normal
operation.
No
INSTALL a new air bag
sliding contact; REFER
to Section 501 - 20B .
TEST the system for
normal operation. A9 CHECK THE SPEED CONTROL ACTUATOR SWITCH ON
CIRCUITRY FOR SHORT TO POWER z
Key in ON position.
z Measure the voltage between speed control servo C122 Pin 5,
Circuit 151 (LB/BK), harness side and speed control servo C122
Pin 10, Circuit 1205 (BK), harness side. Yes
GO to
A10 .
No
GO to A12 . Klj . 6 ba
132003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2308/S3B~us~en~ ...

z
Is any voltage present? A10 CHECK CIRCUIT 151 (LB/BK) FOR SHORT TO POWER
z
Key in OFF position.
z Disconnect: Air Bag Sliding Contact C218a.
z Key in ON position.
z Measure the voltage between speed control servo C122 Pin 5,
Circuit 151 (LB/BK), harness side and speed control servo C122
Pin 10, Circuit 1205 (BK), harness side.
z Is any voltage present? Yes
REPAIR the circuit.
TEST the system for
normal operation.
No
GO to
A11 .
A11 CHECK THE AIR BAG SLIDING CONTACT
z
Key in OFF position.
z Remove the air bag; REFER to Section 501 - 20B .
z Disconnect: Speed Control Actuator Switch.
z Key in ON position.
z Measure the voltage between bottom of air bag sliding contact
Pin 1 (component side) and ground.
z Is any voltage present? Yes
INSTALL a new air bag
sliding contact; REFER
to Section 501
- 20B .
TEST the system for
normal operation.
No
INSTALL a new speed
control actuator switch;
REFER to Switch —
Speed Control
Actuator . TEST the
system for normal
operation. A12 CHECK THE SPEED CONTROL ACTUATOR SET/ACCEL
CIRCUITRY z
Key in OFF position.
z Measure the resistance between speed control servo C122 Pin
5, Circuit 151 (LB/BK), harness side and speed control servo
C122 Pin 6, Circuit 848 (DG/OG), harness side, while the speed
control actuator switch SET/ACCEL is depressed. Yes
GO to
A13 .
No
INSTALL a new speed
control actuator switch; Klj . 7 ba
132003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2308/S3B~us~en~ ...

PINPOINT TEST C: THE SPEED CONTROL DOES NOT DISENGAGE
WHEN THE BRAKES ARE APPLIED
PINPOINT TEST D: THE SPEED CONTROL DOES NOT DISENGAGE
WHEN THE CLUTCH IS APPLIED B2 CHECK THE SPEED CONTROL
ACTUATOR CABLE z
NOTE: The speed control actuator cable
must be disconnected at both ends while
carrying out this test.
z Check the speed control actuator cable
for sticking or binding at the speed
control servo and throttle body.
z Is the speed control actuator cable
OK? Yes
GO to
B3 .
No
INSTALL a new speed control actuator cable;
REFER to Actuator Cable — Speed Control .
TEST the system for normal operation. B3 CHECK THE SPEED CONTROL SERVO
z
INSTALL a known good speed control
servo.
z Test drive the vehicle for correct
operation.
z Does the speed control operate
correctly? Yes
INSTALL a new speed control servo; REFER
to
Actuator — Speed Control Servo . TEST the
system for normal operation.
No
INSTALL a new PCM; REFER to Section 303 -
14 . TEST the system for normal operation.
Test Step Result / Action to Take
C1 CHECK THE BPP SWITCH CIRCUITRY
z
Key in OFF position.
z Disconnect: Speed Control Servo C122 .
z Measure the voltage between speed control servo C122 Pin 4,
Circuit 511 (LG), harness side and speed control servo C122
Pin 10, Circuit 1205 (BK), harness side, while depressing the
brake pedal.
z Is the voltage greater than 10 volts? Yes
INSTALL a new speed
control servo; REFER to
Actuator
— Speed
Control Servo . TEST
the system for normal
operation.
No
REPAIR Circuit 810
(RD/LG) and Circuit 511
(LG) as necessary.
TEST the system for
normal operation. Test Step Result / Action to Take
D1 CHECK THE CLUTCH PEDAL POSITION (CPP) SWITCH
z
Key in OFF position.
z Disconnect: CPP Switch C2072.
z Measure the resistance between CPP switch pin 2
(component side) and CPP switch pin 1 (component side), Yes
INSTALL a new speed
control servo; REFER to
Actuator
— Speed Control Klj . 10 ba
132003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2308/S3B~us~en~ ...

PINPOINT TEST E: THE SPEED CONTROL SWITCH IS
INOPERATIVE—
COAST
PINPOINT TEST F: THE SPEED CONTROL SWITCH IS
INOPERATIVE— SET/ACCEL while depressing and releasing clutch pedal.
z Is the resistance greater than 10,000 ohms with the
clutch pedal depressed and less than 5 ohms with the
clutch pedal released? Servo . TEST the system
for normal operation.
No
INSTALL a new CPP
switch. TEST the system
for normal operation. Test Step Result / Action to
Take E1 CHECK THE SPEED CONTROL ACTUATOR SWITCH
z
Key in OFF position.
z Disconnect: Speed Control Servo C122.
z Measure the resistance between speed control servo C122 Pin
5, Circuit 151 (LB/BK), harness side and speed control servo
C122 Pin 6, Circuit 848 (DG/OG), harness side, while pressing
the speed control actuator switch COAST.
z Is the resistance between 108 and 132 ohms? Yes
INSTALL a new speed
control servo; REFER
to
Actuator — Speed
Control Servo . TEST
the system for normal
operation.
No
INSTALL a new speed
control actuator switch;
REFER to Switch —
Speed Control
Actuator . TEST the
system for normal
operation. Test Step Result / Action to
Take F1 CHECK THE SPEED CONTROL ACTUATOR SWITCH
z
Key in OFF position.
z Disconnect: Speed Control Servo C122.
z Measure the resistance between speed control servo C122 Pin 5,
Circuit 151 (LB/BK), harness side and speed control servo C122
Pin 6, Circuit 848 (DG/OG), harness side, while pressing the
speed control actuator switch SET/ACCEL. Yes
INSTALL a new speed
control servo; REFER
to
Actuator — Speed
Control Servo . TEST
the system for normal
operation. Klj . 11 ba
132003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2308/S3B~us~en~ ...

PINPOINT TEST G: THE SPEED CONTROL SWITCH IS
INOPERATIVE —
RESUME
PINPOINT TEST H: THE SPEED CONTROL SWITCH IS
INOPERATIVE— OFF z
Is the resistance between 612 and 748 ohms? No
INSTALL a new speed
control actuator switch;
REFER to
Switch —
Speed Control
Actuator . TEST the
system for normal
operation. Test Step Result / Action to
Take G1 CHECK THE SPEED CONTROL ACTUATOR SWITCH
z
Key in OFF position.
z Disconnect: Speed Control Servo C122.
z Measure the resistance between speed control servo C122 Pin
5, Circuit 151 (LB/BK), harness side and speed control servo
C122 Pin 6, Circuit 848 (DG/OG), harness side while pressing
the speed control actuator switch RESUME.
z Is the resistance between 1,980 and 2,420 ohms? Yes
INSTALL a new speed
control servo; REFER
to
Actuator — Speed
Control Servo . TEST
the system for normal
operation.
No
INSTALL a new speed
control actuator switch;
REFER to Switch —
Speed Control
Actuator . TEST the
system for normal
operation. Test Step Result / Action to
Take H1 CHECK THE SPEED CONTROL ACTUATOR SWITCH
z
Key in OFF position.
z Disconnect: Speed Control Servo C122.
z Measure the resistance between speed control servo C122 Pin
5, Circuit 151 (LB/BK), harness side and speed control servo
C122 Pin 6, Circuit 848 (DG/OG), harness side while pressing
the speed control actuator switch OFF. Yes
INSTALL a new speed
control servo; REFER
to
Actuator — Speed
Control Servo . TEST
the system for normal
operation.
No Klj . 12 ba
132003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2308/S3B~us~en~ ...

Pinpoint Tests
PINPOINT TEST P1464: DTC P1464: A/C DEMAND OUT OF SELF-
TEST RANGE high speed
motor switch resistor.
z Damaged heater blower
motor switch. Test H .
z No operation in high
blower setting z
Circuitry short/open.
z Damaged heater blower
motor switch. z
Go To Pinpoint
Test I .
z No operation in lower
speeds z
Circuitry short/open.
z Damaged heater blower
motor switch resistor.
z Damaged heater blower
motor switch. z
Go To Pinpoint
Test J .
Test Step Result / Action to Take
P14641 RECHECK FOR THE DTC
z
Key in ON position.
z Make sure the function selector switch is in the OFF
position.
z Enter the following diagnostic mode on the diagnostic
tool: PCM Self- Test.
z Is DTC P1464 retrieved? Yes
GO to
P14642 .
No
The system is functioning
correctly. This DTC will set if the
A/C is turned on when carrying
out the PCM self- test. P14642 CHECK PID ACCS WITH THE A/C CONTROL
DISCONNECTED z
Key in OFF position.
z Disconnect: Function Selector Switch C294c.
z Key in ON position.
z Enter the following diagnostic mode on the diagnostic
tool: PCM PID ACCS.
z Does PID ACCS read ON? Yes
GO to
P14643 .
No
INSTALL a new function selector
switch. REFER to Section 412 -
04 . REPEAT the PCM self-test
and verify DTC P1464 is no
longer retrieved. P14643 CHECK CIRCUIT 348 (VT) FOR A SHORT TO B+
z
Key in OFF position.
z Disconnect: PCM C175.
z Key in ON position.
z Measure the voltage at the function selector switch
C294c- 4, circuit 348 (VT), the harness side and ground. Yes
REPAIR circuit 348 (VT ) for a
short to B+. REPEAT the PCM
self-
test and verify DTC P1464 is
no longer retrieved.
No
INSTALL a new powertrain
control module. REFER to
Section 303 - 14 . REPEAT the
PCM self- test and verify DTC
P1464 is no longer retrieved. Klj . 7 ba
412003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2308/S3B~us~en~ ...

PINPOINT TEST A: INCORRECT/ERRATIC DIRECTION OF AIRFLOW
FROM OUTLET z
Is there voltage present? Test Step Result / Action to
Take A1 CHECK AIRFLOW FROM DEFROSTER OUTLETS
z
Key in START position.
z Place the heater blower motor switch in the HI position and
rotate the function selector switch to each position.
z Check for correct airflow from each function selector switch
position at engine idle and during engine speed acceleration.
z Is there airflow from defroster outlets under all conditions? Yes
GO to
A2 .
No
If the airflow is from
defroster outlets in all
switch positions only
under engine speed
acceleration, GO to
A19 .
If the airflow is
incorrect under one or
more conditions, GO to
A13 .
If the airflow is correct
under all conditions,
RETURN to the
Symptom Chart. A2 CHECK THE VACUUM SUPPLY HOSE
z
Key in OFF position.
z Verify the vacuum supply hose is connected between the engine
manifold and the A/C vacuum check valve.
z Is the hose connected? Yes
GO to
A3 .
No
RECONNECT the
hose. TEST the system
for normal operation. A3 LEAK CHECK THE VACUUM SUPPLY HOSE Klj . 8 ba
412003 Mustang Workshop Manual
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