pinpoint FORD MUSTANG 2003 Workshop Manual

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~ ...

Symptom Chart
Condition
Possible Sources Action
z Incorrect/erratic direction
of airflow from outlet(s) z
No vacuum to A/C heater
function switch selector.
z A/C heater function selector
switch leaks vacuum.
z Kinked/pinched vacuum hose.
z Leaking vacuum control
motor.
z Leaking A/C vacuum check
valve.
z Leaking A/C vacuum reservoir
tank and bracket.
z Vacuum actuator arm not
connected to door crank. z
Go To Pinpoint
Test A .
z Insufficient, erratic, or no
heat z
Low engine coolant level.
z Thermostat stuck open.
z Disengaged/damaged
temperature cable. z
Go To Pinpoint
Test B .
z The A/C does not
operate/does not operate
correctly z
CASS strategy failure.
z Open fuses.
z A/C clutch relay.
z Shorted blend door actuator.
z Powertrain control module.
z Circuitry short/open.
z A/C cycling switch damaged.
z A/C system discharged/low
charge.
z Function selector switch
damaged.
z A/C pressure cut-off switch
damaged.
z A/C compressor clutch
damaged. z
Go To Pinpoint
Test C .
z The A/C is always on zCircuitry short/open.
z A/C cycling switch.
z A/C heater function selector
switch.
z Constant control relay
module.
z Incorrect A/C clutch air gap. z
Go To Pinpoint
Test D .
z Insufficient A/C cooling zRestricted A/C evaporator
core orifice.
z Low refrigerant level. z
Go To Pinpoint
Test E .
z No operation in all the
temperature settings z
Damaged blend door actuator
cable.
z Damaged air temperature
control door. z
Go To Pinpoint
Test F .
z The blower motor does
not operate z
Open fuse.
z Circuitry open/shorted.
z Damaged heater blower
motor switch (18578).
z Damaged heater blower
motor switch resistor (18591).
z Damaged blower motor relay.
z Damaged blower motor. z
Go To Pinpoint
Test G .
z The blower motor
operates continuously in z
Circuitry short/open.
z Damaged heater blower z
Go To Pinpoint Klj . 6 ba
412003 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
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2308/S3B~us~en~ ...

PINPOINT TEST B: INSUFFICIENT, ERRATIC, OR NO HEAT z
Does the vacuum control motor hold a vacuum? A20 CHECK THE VACUUM CONTROL MOTOR INSTALLATION
z
Key in OFF position.
z Check the attachment of the vacuum control motor arm to
damper door.
z Is the vacuum control motor arm attached to the door or
door crank arm? Yes
REPAIR or INSTALL a
new damper door.
TEST the system for
normal operation.
No
CONNECT the vacuum
control motor arm to
the door and check
operation. TEST the
system for normal
operation.
Test Step Result / Action to Take
B1 CHECK FOR CORRECT ENGINE COOLANT LEVEL
z
Key in OFF position.
z Check the engine coolant level when hot and cold.
z Is the engine coolant at the correct level (hot/cold) as
indicated on the engine coolant recovery reservoir? Yes
GO to
B2 .
No
GO to B3 .
B2 CHECK FOR HOT WATER TO THE HEATER CORE INLET
HOSE WARNING: The heater core inlet hose will become
too hot to handle and may cause serious burns if the
system is working correctly.
z Key in START position.
z Allow the engine to reach normal operating temperature.
z Feel the heater core inlet hose. Yes
GO to
B4 .
No
TEST the engine cooling
system for correct
operation. REFER to
Section 303 - 03A or
Section 303 - 03B . Klj . 14 ba
412003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2308/S3B~us~en~ ...

PINPOINT TEST C: THE A/C DOES NOT OPERATE/DOES NOT
OPERATE CORRECTLY z
Is the heater core inlet hose too hot to handle? B3 CHECK THE ENGINE COOLING SYSTEM INCLUDING
RADIATOR CAP FOR LEAKS z
Fill the engine cooling system to specified level.
z NOTE: It is not necessary to check the components
separately at this time.
z Pressure check the engine cooling system. Refer to Section 303 - 03A or
Section 303 - 03B .
z Does the engine cooling system, including the radiator
cap, hold pressure? Yes
GO to
B4 .
No
Pressure test the heater
core. REFER to
Component Tests, Heater
Core — Pressure Test. B4 CHECK THE HEATER CORE OUTLET HOSE FOR HOT
WATER z
Feel the heater core outlet hose.
z Is the heater core outlet hose cool or cold? Yes
TEST the heater core for a
plugged or partially
plugged condition. REFER
to
Section 303 - 03A or
Section 303 - 03B .
No
GO to Pinpoint Test E .
Test Step Result / Action to Take
C1 CHECK THE PCM PID WACF
z
Connect the diagnostic tool.
z Turn the function selector to the OFF position.
z Key in ON position.
z Enter the following diagnostic mode on the diagnostic
tool:
z Monitor the PCM PID WACF while turning the function
selector.
z Does the PCM PID WACF read YES? Yes
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
No
GO to
C2 .
C2 CHECK THE PCM PID WACF WITH THE A/C ON
z
Turn the function selector switch to the A/C position.
z Enter the following diagnostic mode on the diagnostic Yes
REFER to the Powertrain Klj . 15 ba
412003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2308/S3B~us~en~ ...

PINPOINT TEST D: THE A/C IS ALWAYS ON z
Is the resistance less than 5 ohms? No
REPAIR circuit 1205 (BK) for
an open. TEST the system for
normal operation.
Test Step Result / Action to Take
D1 CHECK PCM PID WACF
z
Turn the function selector switch to the OFF position.
z Key in ON position.
z Enter the following diagnostic mode on the diagnostic
tool: PCM PID WACF.
z Does the PCM PID WACF read YES? Yes
REPAIR circuit 331 (PK/YE) for
a short to ground. TEST the
system for normal operation.
No
GO to
D2 .
D2 CHECK PID ACCS WITH A/C OFF
z
Enter the following diagnostic mode on the diagnostic
tool: PCM PID ACCS.
z Does the PCM PID ACCS read ON? Yes
GO to
D3 .
No
GO to D5 .
D3 CHECK FOR A FALSE INPUT SIGNAL TO THE PCM
z
Key in OFF position.
z Disconnect: PCM C175.
z Key in ON position.
z Turn the function selector switch to the OFF position.
z Measure the voltage between PCM C175- 41, circuit 198
(DG/OG) harness side and ground.
z Is the voltage greater than 10 volts? Yes
GO to
D4 .
No
INSTALL a new powertrain
control module. REFER to
Section 303 - 14 . TEST the
system for normal operation. D4 CHECK CIRCUIT 198 (DG/OG) FOR A SHORT TO B+
z
Key in OFF position.
z Disconnect: Function Selector Switch C294c.
z Connect: PCM C175.
z Key in ON position.
z Measure the voltage at the function selector switch Yes
REPAIR circuit 348 (PK) for a
short to B+. TEST the system
for normal operation. Klj . 24 ba
412003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2308/S3B~us~en~ ...

PINPOINT TEST E: INSUFFICIENT A/C COOLING C294c-
3, circuit 348 (PK), harness side and ground.
z Is there voltage present? No
INSTALL a new function
selector switch. REFER to
Section 412
- 04 . TEST the
system for normal operation. D5 CHECK FOR A SHORTED CLUTCH INPUT
z
Key in OFF position.
z Disconnect: A/C Clutch C100.
z Key in ON position.
z Measure for voltage at the A/C clutch C100, circuit 347
(BK/YE), harness side and ground.
z Is there voltage present? Yes
INSTALL a new constant
control relay module. TEST the
system for normal operation.
No
CHECK the clutch air gap.
REFER to
Air Conditioning (A/C) Clutch Air Gap
Adjustment .
Test Step Result / Action to Take
E1 CHECK THE CENTER A/C REGISTER DISCHARGE
TEMPERATURE z
Carry out the refrigerant system tests. Refer to
Refrigerant System Tests in this section.
z Use the recorded data from the refrigerant system tests
to plot a vertical line for ambient temperature and a
horizontal line for center A/C register discharge
temperature.
z Is the intersection of the two lines within the upper
and lower limits? Yes
The tests indicate that the
system is functioning normally.
No
GO to
E2 . Klj . 25 ba
412003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2308/S3B~us~en~ ...