brake sensor FORD MUSTANG 2003 Repair Manual
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Page 710 of 4378
1. Remove the rear anti-
lock brake sensor bolt.
2. Remove the rear anti- lock brake sensor.
Installation 1. NOTE: Be sure to apply High Temperature Nickel Anti- Sieze Lubricant F6AZ-9L494-AA
meeting Ford specification ESE-M124A- A to the sensor body where it will make contact when
installed.
To install, reverse the removal procedure. Klj . 2 ba
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Symptom Chart
Pinpoint Tests
PINPOINT TEST A: NO COMMUNICATION WITH THE GENERIC
ELECTRONIC MODULE Circuit Failure
B2488 RF Side Repeater Lamp Output
Circuit Failure GEM REFER to
Section 417 - 01 .
C1189 Brake Fluid Level Sensor Input
Short Circuit to Ground GEM REFER to
Section 413 - 01 .
C1223 Lamp Brake Warning Output
Circuit Failure GEM REFER to
Section 413 - 01 .
C1225 Lamp Brake Warning Output
Circuit Short to Battery GEM REFER to
Section 413 - 01 .
Symptom Chart Condition
Possible Sources Action
z No communication with
the generic electronic
module z
CJB Fuse 39
(5A).
z Circuitry.
z GEM. z
Go To Pinpoint Test A .
z The ignition switch is
inoperative z
BJB Fuse IGN
SW (40A).
z Ignition switch.
z Circuitry. z
Go To Pinpoint Test B .
z No power in ACC zIgnition switch.
z Circuitry. z
Go To Pinpoint Test C .
z No power in RUN zIgnition switch.
z Circuitry. z
Go To Pinpoint Test D .
z No power in START zIgnition switch.
z Circuitry. z
Go To Pinpoint Test E .
z The multifunction
switch/hazard switch
does not operate
correctly z
Multifunction
switch. z
Carry out the multifunction
switch component test.
REFER to Wiring Diagrams,
Cell 149, Component
Testing. Test Step Result / Action to Take
CAUTION: Use the correct probe adapter(s) when making measurements. Filaure to
use the correct probe adapter(s) may damage the connector. A1 CHECK THE GENERIC ELECTRONIC MODULE (GEM)
POWER SUPPLY z
Key in OFF position.
z Disconnect: Generic Electronic Module (GEM) C201a. Yes
GO to
A2 . Klj . 4 ba
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IN-
VEHICLE REPAIR
Valve Cover LH
Removal and Installation 1. Remove the Hydro Boost brake booster. For additional information, refer to Section 206 - 07 .
2. Remove the LH ignition coils. For additional information, refer to Section 303 - 07C .
3. Disconnect the engine coolant temperature (ECT) sensor and unclip the wiring harness from the stud.
4. Unclip the wiring harness from the power steering bracket.
5. Disconnect the electrical connectors from the fuel pulse damper, EGR vacuum regulator solenoid, supercharger bypass vacuum solenoid, and the differential pressure feedback EGR
system.
SECTION 303-
01C: Engine — Cobra 4.6L (4V) 2003 Mustang Workshop Manual Material
Item Specification
Silicone Gasket and Sealant
F7AZ-
19554- EA WSE-
M4G323- A4 Metal Surface Cleaner
F4AZ-
19A536- RA WSE-
M5B392- A Klj . 1 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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The TCC solenoid is used to control the apply and release of the TCC.
Shift Solenoid —
SSA, SSB
Two on/off shift solenoids provide gear selection of first through fourth gears by controlling the
pressure to the three shift valves. One unit containing the two shift solenoids is located in the main
control valve body. The shift solenoids are two- way, normally open style.
a When a manual pull- in occurs above a calibrated speed, the transmission will not downshift from the
higher gear until the vehicle speed drops below this calibrated speed.
EC = Electronically Controlled
HD = Hydraulically Disabled
Transmission Fluid Temperature (TFT) Sensor
The transmission fluid temperature (TFT) sensor is located on the lead frame assembly near the shift
solenoids on the main control valve body. It is a temperature- sensitive device called a thermistor. It
sends a voltage signal to the PCM. The voltage signal varies with transmission fluid temperature. The
PCM uses this signal to determine whether a cold start shift schedule is necessary. The shift schedule
is compensated when the transmission fluid temperature is cold. The PCM also inhibits (TCC)
operation at low transmission fluid temperatures and corrects electronic pressure control.
Vehicle Speed (VSS) Sensor
The source of vehicle speed (VSS) is model dependent. Possible sources of vehicle speed input are
anti- lock brake sensor (ABS), a gear- driven vehicle speed sensor (VSS), or an output shaft speed
sensor (OSS). The VSS signal is either an A/C signal whose frequency changes with speed, or an
SCP data message depending on the source. Some applications will have both. The vehicle speed
signal is an input to various vehicle subsystems such as the powertrain control module (PCM),
instrument cluster (speedometer and odometer), speed control system, etc. The vehicle speed source
must be operational to enter output state control (OSC) mode for diagnostics.
Regardless of the type of vehicle speed system, the PCM always uses the OSS for transmission and Solenoid Operation Chart Selector Lever Position PCM Commanded Gear Solenoids
SSA SSB TCC
P/R/N 1 ON OFF HD
(D) 1 ON OFF HD
(D) 2 OFF OFF EC
(D) 3 OFF ON EC
(D) 4 ON ON EC
w/OD OFF
1 1 ON OFF HD
2 2 OFF OFF EC
3 3 OFF ON EC
Manual 2 2 OFF OFF EC
Manual 1 1 ON OFF HD
1
a 2 OFF OFF EC Klj . 3 ba
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z
the engine is ON.
z the transmission range selector lever is in O/D.
z the vehicle speed is greater than 3.2 km/h (2 mph).
OSC "TCC ON" DRIVE MODE operates ONLY when:
zthe digital TR sensor is operational and no digital TR sensor DTCs are present.
z the vehicle speed sensor is operational and no VSS sensor DTCs are present.
z the engine is ON.
z the transmission range selector lever is in O/D.
z the vehicle speed is greater than 3.2 km/h (2 mph).
z the transmission is in 2nd gear or higher.
z the TFT is between 15 and 135°C (60 and 275°F).
z the brake is not applied "OFF" below 32 km/h (20 mph).
z (Not an excessive load on engine (engine lugging).
OSC Command Values
zOFF - turns TCC OFF.
z ON - turns TCC ON.
z XXX - cancels OSC value sent.
z SEND - sends the values to PCM.
Drive Mode Procedures for TCC
Follow operating instructions from the scan tool menu screen.
zSelect "Output State Control."
z Select "Trans - Drive Mode."
z Select "PIDs" to be monitored.
z Monitor all selected PIDs during test.
z Select "Parameters - TCC."
z Select "ON" to turn solenoid ON.
z Press "SEND" to send command ON.
z Select "OFF" to turn solenoid OFF.
z Press "SEND" to send command OFF.
z Select "XXX" to cancel at any time.
z Press "SEND."
EPC in DRIVE MODE
This OSC function is used to increase the EPC pressure while testing the transmission shift functions.
This OSC function can only increase the EPC pressure greater than what the PCM normally
commands. If an OSC value, such as (75) or (90) psi is sent, the upshifts and downshifts should
exhibit a firmer shift. Firmer shifts would indicate that the EPC pressure control is working at higher Klj . 6 ba
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DIAGNOSIS AND TESTING
Transmission Drive Cycle Test
NOTE:
Always drive the vehicle in a safe manner according to driving conditions and obey all traffic
laws.
NOTE: The Transmission Drive Cycle Test must be followed exactly. Malfunctions must occur four
times consecutively for shift error DTC code to be set, and five times consecutively for continuous TCC
code to set.
NOTE: When carrying out the Transmission Drive Cycle Test, refer to the Solenoid Application Chart
for correct solenoid operation.
After carrying out the Quick Test, use the Transmission Drive Cycle Test for checking continuous
codes.
1. Record and then erase Quick Test codes.
2. Warm engine to normal operating temperature.
3. Make sure transmission fluid level is correct.
4. With transmission in OVERDRIVE, moderately accelerate from stop to 80 km/h (50 mph). This allows the transmission to shift into fourth gear. Hold speed and throttle open steady for a
minimum of 15 seconds.
5. With transmission in fourth gear and maintaining steady speed and throttle opening, lightly apply and release brake to operate stoplamps. Then hold speed and throttle steady for a
minimum of five seconds.
6. Brake to a stop and remain stopped for a minimum of 20 seconds.
7. Repeat steps 4 through 6 at least five times.
8. Carry out Quick Test and record continuous DTCs. zIf the DTCs are still present, refer to the Diagnostic Trouble Code Chart. Repair all non
transmission DTCs first as they can directly affect the operation of the transmission.
Repeat the Quick Test and the Road Test to verify the correction. Erase the DTCs, carry
out the Drive Cycle Test and repeat the Quick Test after completing repair on the DTC.
z If the continuous test passes and a concern is still present, refer to Diagnosis By Symptom in this section, OASIS messages, and TSBs for concerns.
After On- Board Diagnostic
NOTE: The vehicle wiring harness, PCM and non- transmission sensors may affect transmission
operations. Repair these concerns first.
After the on- board diagnostic procedures are completed, repair all DTCs.
Begin with non- transmission related DTCs, then repair any transmission related DTCs. Use the
diagnostic trouble code chart for information on condition and symptoms. This chart will be helpful in
referring to the correct manual(s) and aids in diagnosing internal transmission concerns and external
non- transmission inputs. The pinpoint tests are used in diagnosing transmission electrical concerns.
Make sure that the vehicle wiring harness and the PCM are diagnosed as well. The Powertrain SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Klj . 1 ba
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P0713 TFT, wiring,
PCM -40°C (-
40°F)
indicated TFT
sensor circuit
open Voltage drop
across TFT sensor
exceeds scale set
for temperature -
40°C (-
40°F). Firm shift feel. Go To Pinpoint
Test B .
P1710 TFT TFT sensor in
range
malfunction PCM detected
TFT not changing. Firm shift, TCIL
flashing, increase in
EPC. Go To Pinpoint
Test B .
P1711 TFT TFT out of on-
board
diagnostic
range Transmission not
at operating
temperature
during on-
board
diagnostic. Warm vehicle to
normal operating
temperature. Go To Pinpoint
Test B .
P1713 TFT wiring
PCM TFT
continually
reading cold TFT sensor in
range low failure. Firm shift feel.
Substitute ECT for
TFT Go To Pinpoint
Test B .
P1718 TFT, wiring,
PCM TFT
continually
reading hot TFT sensor in
range high failure. Firm shift feel.
Substitute ECT for
TFT Go To Pinpoint
Test B .
P1783 TFT Transmission
over
temperature
condition
indicated Transmission fluid
temperature
exceeded 127°C
(270°F). Increase in EPC
pressure. Go To Pinpoint
Test B .
P0720 OSS Insufficient
input from
output shaft
speed sensor PCM detected a
loss of OSS signal
during operation. Harsh shifts,
abnormal shift
schedule, no torque
converter clutch
activation. Go To Pinpoint
Test E .
P0721 OSS OSS sensor
signal noisy PCM has detected
an erratic OSS
signal. Harsh shifts,
abnormal shift
schedule, no torque
converter clutch
engagement. Go To Pinpoint
Test E .
P0722 OSS wiring Insufficient
input from
OSS PCM has detected
a loss of OSS
signal. Harsh shifts,
abnormal shift
schedule, no torque
converter clutch
engagement. Go To Pinpoint
Test E .
P0741
** TCC,
internal
components TCC slippage
detected The PCM picked
up an excessive
amount of
slippage during
normal vehicle
operation. TCC
slippage/erratic or
no torque converter
clutch operation.
Flashing
Transmission
Control Indicator
Lamp (TCIL). GO to
Diagnosis By Symptom .
P0743
* TCC, wiring,
PCM TCC solenoid
circuit failure
during on-
board
diagnostic TCC solenoid
circuit fails to
provide voltage
drop across
solenoid. Circuit
open or shorted or
PCM driver failure
during on-
board
diagnostic. Short circuit: engine
stalls in second
(OD, 2 range) at
low idle speeds with
brake applied.
Open circuit: torque
converter clutch
never engages. Go To Pinpoint
Test A .
P1746 EPC, wiring, Shorted PCM Voltage through Open circuit causes Go To Pinpoint Klj . 3 ba
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a
Output circuit check, generated only by electrical symptoms.
b May also be generated by some other non- electric transmission hardware system.
Rotunda Transmission Tester
The Transmission Tester is used to diagnosis the digital transmission range sensor and is used in
conjunction with the pinpoint tests. The tests should be carried out in order. Installing the Transmission
Tester allows separation of the vehicle electronics from transmission electronics; refer to the
Transmission Tester manual for these tests.
zDigital Transmission Range (TR) Sensor Testing components converter
clutch
engagement
error (engine speed
surge) across the
torque converter
clutch. present in 3rd gear.
P1742 TCC,
internal
components TCC solenoid
failed ON TCC solenoid has
failed on by
electric,
mechanical or
hydraulic concern. Harsh shifts. Go To Pinpoint
Test A .
P1743 TCC,
internal
components TCC solenoid
failed ON TCC solenoid has
failed ON by
electric,
mechanical or
hydraulic concern. Harsh shifts. Go To Pinpoint
Test A .
P1744 TCC TCC The PCM picked
up an excessive
amount of TCC
slippage during
normal vehicle
operation. TCC
slippage/erratic or
no torque converter
clutch operation. GO to Diagnosis by
Symptom.
P1767 TCC TCC solenoid
circuit failure
during OBD
Test TCC solenoid
circuit fails to
provide voltage
drop across
solenoid. Circuit
open or shorted or
PCM Driver failure
during OBD Test. Short circuit: engine
stalls in second
(O/D, 2 range) at
low idle speeds with
brake applied.
Open circuit:
Torque Converter
never engages. Go To Pinpoint
Test A .
P1780 TCS TCS not
changing
states TCS not cycled
during self-
test.
TCS circuit open
or shorted. Rerun on-
board
diagnostic and
cycle switch. No
OD cancel when
switch is cycled. REFER to the
Powertrain
Control/Emissions
Diagnosis (PC/ED)
manual.
— TCIL TCIL circuit
failure TCIL circuit open
or shorted. Failed on, OD
cancel mode on. No
flashing TCIL for
EPC failure or
sensor. Failed off,
OD cancel mode
never indicated. No
flashing TCIL for
EPC sensor failure. REFER to the
Powertrain
Control/Emissions
Diagnosis (PC/ED)
manual
P1709 PNP switch PNP switch
out of self-
test
range Vehicle not in
PARK or
NEUTRAL during
on-
board
diagnostic. Rerun on-
board
diagnostic in PARK
or NEUTRAL. Go To Pinpoint
Test C . Klj . 7 ba
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C1 VERIFY DIAGNOSTIC TROUBLE CODES
z
Select PARK.
z Key in OFF position.
z NOTE: DTC codes P0705 and P0708 cannot be set by
an incorrectly adjusted digital TR sensor.
z Carry out on board diagnostic test.
z Are only DTC codes P0705, P0708 present? Yes
GO to
C4 .
No
GO to C2 .
C2 VERIFY DIGITAL TRANSMISSION RANGE SENSOR
ALIGNMENT z
Check to make sure the digital TR sensor harness
connector is fully seated, pins are fully engaged in
connector and in good condition before proceeding.
z Apply the parking brake.
z Select NEUTRAL.
z Disconnect the shift cable/linkage from the manual lever.
z Verify that the digital TR Sensor Alignment Tool fits in
the appropriate slots.
z Is the digital TR sensor adjustment OK? Yes
GO to
C3 .
No
ADJUST the digital TR sensor.
PLACE transmission range
selector lever in P and CLEAR
DTCs. REPEAT OBD Tests.GO
to C3 .
C3 VERIFY SHIFT CABLE/LINKAGE ADJUSTMENT
z
Place the manual lever in the overdrive position.
z Select DRIVE.
z Reconnect the shift cable/linkage.
z Verify that the shift cable/linkage is adjusted OK. Refer
to Section 307 - 05 .
z Is the shift cable/linkage adjusted OK? Yes
GO to
C4 .
No
ADJUST the shift cable/linkage.
REFER to Section 307 - 05 .
C4 CHECK ELECTRICAL SIGNAL OPERATION
z
Select PARK.
z Disconnect: Digital TR Sensor.
z CAUTION: Do not pry on connector. This will
damage the connector and result in a transmission
concern.
z Press the button and pull out on the digital TR harness
connector.
z Inspect both ends of the connector for damage or
pushed- out pins, corrosion, loose wires and missing or
damaged seals.
z Are the connector, pins and harness damaged? Yes
REPAIR as required. CLEAR
DTCs and REPEAT OBD
Tests.
No
If diagnosing a DTC, GO to
C5
.
If diagnosing a starting concern
or a reversing lamp concern,
GO to C10 .
C5 CHECK ELECTRICAL SYSTEM OPERATION (DIGITAL
TR AND PCM) z
Key in OFF position.
z Connect the diagnostic tool.
z Connect: Digital TR Sensor.
z Key in ON position.
z Enter the following diagnostic mode on the diagnostic
tool: TR PIDS TR, TR_D, TR_V.
z Move transmission range selector lever into each gear
and stop.
z Observe any of the following PIDs, TR and TR_D, TR_V
(vehicle dependent) while wiggling harness, tapping on
sensor, or driving the vehicle. Use PIDs TR, and TR_D
for DTCs P0705, P1704, and P1705. Use PIDs TR, and
TR_V for DTC P0708.
z Compare the PIDs to the Digital Transmission Range
(TR) Sensor Diagnosis Chart.
z Do the PIDs TR, TR_D and TR_V match the Digital
Transmission Range (TR) Sensor Diagnosis chart,
and does the TR_D PID remain steady when the Yes
The problem is not in the digital
TR sensor system. REFER to
Diagnosis By Symptom
in this
section for further diagnosis.
No
If TR_D changes when wiggling
harness, tapping on the sensor,
or driving the vehicle, the
problem may be intermittent.
GO to C6 . Klj . 10 ba
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