transmission fluid FORD MUSTANG 2003 Service Manual

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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DIAGNOSIS AND TESTING
Transmission Connector Layouts
Transmission Vehicle Harness Connector
Transmission Internal Harness Connector SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Pin Number Circuit Circuit Function
1 — NOT USED
2 — Signal Return
3 — Torque Converter Clutch (TCC) Solenoid
4 — Vehicle Power
5 — Transmission Fluid Temperature (TFT) Input
6 — Electronic Pressure Control (EPC) Solenoid
7 — SSA
8 — SSB
9 — NOT USED
10 — NOT USED Klj . 1 ba
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Digital Transmission Range (TR) Sensor Connector Pin Number Circuit Circuit Function
1 — NOT USED
2 — Signal Return Transmission Fluid Temperature (TFT)
3 — Torque Converter Clutch (TCC)
4 — Vehicle Power To Solenoid
5 — Transmission Fluid Temperature (TFT)
6 — Electronic Pressure Control
7 — SSA
8 — SSB
9 — NOT USED
10 — NOT USED
Pin Number Circuit Circuit Function Klj . 2 ba
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NOTE:
Refer to the Transmission Vehicle Harness Connector illustration preceding these
pinpoint tests. A1 ELECTRONIC DIAGNOSTICS
z
Select PARK.
z Key in OFF position.
z Check to make sure the transmission harness connector
is fully seated, pins are fully engaged in connector and
in good condition before proceeding.
z Connect the diagnostic tool.
z Key in ON position.
z Enter the following diagnostic mode on the diagnostic
tool: Diagnostic Data Link.
z Enter the following diagnostic mode on the diagnostic
tool: PCM.
z Enter the following diagnostic mode on the diagnostic
tool: Active Command Modes.
z Enter the following diagnostic mode on the diagnostic
tool: Output State Control (OSC).
z Enter the following diagnostic mode on the diagnostic
tool: Trans- Bench Mode.
z Does vehicle enter Trans- Bench Mode? Yes
GO to
A2 .
No
REPEAT procedure to enter
Trans-Bench Mode. If vehicle
did not enter Trans- Bench
Mode, REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual for diagnosis
of PCM. A2 WIGGLE TEST
z
Select PIDs to be monitored.
z Select "ON" to turn suspect solenoid on.
z Press "SEND".
z Wiggle all wiring and connectors to the transmission.
Monitor the Solenoid State for changes.
z Select "OFF" to turn solenoid off.
z Press "SEND".
z Does the suspect solenoid(s) fault state change? PID Command PID Actual
SSA SS1F
SSB SS2F
TCC TCCF Yes
REPAIR open or short in the
vehicle harness or connector.
No
GO to
A3 .
A3 SOLENOID FUNCTIONAL CHECK
z
Monitor each solenoid state.
z Turn each solenoid ON and OFF.
z Does the solenoid turn ON and OFF when
commanded and can solenoid activation be heard? Yes
GO to
A4 .
No
GO to A5 .
A4 OSC TRANS-
DRIVE MODE (GR_CM OR TCC) z
Carry out OSC Trans- Drive Mode.
z Select GR_CM for Shift Solenoids or follow procedures
for GR_CM as listed.
z Select TCC for Torque Converter Clutch Solenoid.
Follow procedures of TCC in Drive Mode as listed.
z Does the transmission upshift and downshift or
torque converter engage/disengage when
commanded? Yes
CLEAR all DTCs. ROAD TEST
to verify if concern is still
present. If concern is still
present, REFER to
Diagnosis By Symptom in this section to
diagnose shift or torque
converter concern.
No
GO to A5 .
A5 CHECK FOR BATTERY VOLTAGE
z
Remove transmission fluid pan. Yes Klj . 4 ba
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PINPOINT TEST B: TRANSMISSION FLUID TEMPERATURE (TFT)
SENSOR
Test Step Result / Action to Take
NOTE:
Refer to the Transmission Connector Layouts preceding these pinpoint tests. B1 ELECTRONIC DIAGNOSTICS
z
Check to make sure the transmission harness
connector is fully seated, pins are fully engaged in
connector and in good condition before proceeding.
z Connect the diagnostic tool.
z Key in ON position.
z Select Diagnostic Data Link.
z Select PCM.
z Select PID/Data Monitor and Record.
z Enter the following diagnostic mode on the diagnostic
tool: PIDs; TFT, TFTV.
z Does the vehicle enter PID/Data Monitor and
Record? Yes
GO to
B2 .
No
REPEAT procedure to enter PID. If
vehicle did not enter PID, REFER
to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual for diagnosis of
PCM. B2 WARM-
UP/COOL-DOWN CYCLE z
While monitoring the TFT PIDs, carry out the
following test: If transmission is cold, run transmission
to warm it up. If transmission is warm, allow
transmission to cool down.
z Do the TFT PIDs increase as the transmission is
warmed up or decrease as the transmission is
cooled or does the TFT or TFTV drop in and out
of range? Yes
If the TFT PIDs increase as the
transmission is warmed or
decrease as the transmission is
cooled, CLEAR all DTCs. ROAD
TEST to verify if concern is still
present. If concern is still present,
REFER to
Diagnosis By Symptom in this section to diagnose
transmission overheating.
If the TFT or TFTV drop in and out
of range, INSPECT for intermittent
concern in the internal/external
harness, sensor or connector.
No
GO to
B3 .
B3 ELECTRICAL SIGNAL CHECK
z
Key in ON position.
z Remove transmission fluid pan.
z Visually inspect the lead frame and connectors for
damage.
z Measure the voltage with the positive lead to positive
TFT at sensor pin and negative lead to a good
ground. Yes
GO to
B4 .
No
CHECK for open or short circuit in
vehicle harness, internal harness
or a PCM concern. Klj . 8 ba
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PINPOINT TEST C: DIGITAL TRANSMISSION RANGE (TR) SENSOR z
Is the voltage present? B4 CHECK RESISTANCE OF TFT SENSOR
z
Disconnect: Transmission Harness .
z Measure the resistance between the positive TFT
and negative TFT pins at transmission connector,
using the following:
z Is the resistance correct? Transmission Fluid Temperature °C °F Resistance (Ohms)
-40 to -
20 -
40 to - 4 967K - 284K
-
19 to - 1 -3 - 31 284K - 100K
0 - 20 32 - 68 100K -
37K 21 - 40 69 -
104 37K - 16K
41 - 70 105 - 158 16K - 5K
71 - 90 159 - 194 5K -
2.7K 91 - 110 195 - 230 2.7K - 1.5K
111 - 130 231 - 266 1.5K - 0.8K
131 - 150 267 - 302 0.8K -
0.54K Yes
REFER to
Diagnosis By Symptom in this section to diagnose an
overheating concern.
No
INSTALL a new internal harness
(sensor is part of harness).
Test Step Result / Action to Take
NOTE:
Refer to the Digital Transmission Range (TR) Sensor Connector illustration preceding
these pinpoint tests. NOTE:
Refer to the Digital Transmission Range (TR) Sensor Diagnosis Chart preceding these
pinpoint tests. Klj . 9 ba
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D2 SOLENOID FUNCTIONAL TEST
z
Install 2,060 kPa (300 psi) pressure gauge into EPC tap.
z Monitor pressure gauge.
z Enter the following diagnostic mode on the diagnostic tool:
Parameter; EPC.
z Select value - 15, 30, 45, 60, 70 or 90 psi.
z Press "SEND".
z Select another value "0- 90 psi".
z Press "SEND".
z Enter the following diagnostic mode on the diagnostic tool:
XXX.
z Press "SEND".
z Does the pressure reading match the commanded
pressure? Yes
CLEAR DTCs. REPEAT OBD
Tests.
No
GO to
D3 .
D3 CHECK FOR BATTERY VOLTAGE
z
Remove transmission fluid pan.
z Visually inspect the lead frame connectors for damage.
z Key in ON position.
z Measure the voltage with positive lead to VPWR solenoid
pin and negative lead to a good ground.
z Is voltage greater than 10 volts? Yes
GO to
D4 .
No
REPAIR the circuit. CLEAR
the DTCs. REPEAT the OBD
Tests. D4 ELECTRICAL SIGNAL CHECK
z
Measure the voltage with positive lead connected to
VPWR solenoid pin and connect negative lead to the
signal pin of the EPC solenoid.
z Turn the solenoids ON and OFF, while monitoring the
voltage reading, solenoid state on the scan tool (ON and
OFF), listen for the solenoid to activate (click).
z Enter the following diagnostic mode on the diagnostic tool:
Trans- Bench Mode.
z Enter the following diagnostic mode on the diagnostic tool:
Parameter EPC.
z Select a value "0- 90 psi".
z Press "SEND".
z Select another value "0- 90 psi".
z Press "SEND".
z Enter the following diagnostic mode on the diagnostic tool: Yes
GO to
D5 .
No
CHECK for open or short
circuit in harness or PCM. Klj . 18 ba
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Stall Speed Test
WARNING: Apply the parking brake firmly while carrying out each stall test.
CAUTION: Carry out line pressure test prior to carrying out stall test. If the line pressure is
low at stall, do not carry out stall test or further transmission damage will occur.
The stall speed test checks:
zthe torque converter clutch operation and installation.
z the holding ability of the forward clutch.
z the reverse clutch (the low- reverse bands).
z the planetary one- way clutch.
z the engine driveability.
Conduct this test with the engine coolant and transmission fluid at correct levels and at normal
operating temperature.
Apply the parking brake firmly for each stall speed test. 1. Find the specified stall rpm for the vehicle; see the stall speed diagnosis chart. Use a grease pencil to mark the rpm on the dial of a tachometer.
2. Connect a tachometer to the engine.
3. NOTE: If the rpm recorded by the tachometer exceeds the maximum limits, release the
accelerator pedal immediately because clutch or band slippage is indicated.
In each of the following ranges (D), 2, 1, R, press the accelerator pedal to the floor and hold it ·
Reverse Clutch Low In Neutral Only ·
Valve Body Low In Overdrive Only ·
Forward Clutch ·
Valve Body Low In 1st Position Only ·
Forward Clutch ·
Valve Body ·
Low/Reverse Servo Low In 2nd Only ·
Intermediate Clutch ·
Valve Bodies ·
Forward Clutch Stall Speed
Application Min. Max.
3.8L engine 2,240 2,619
4.6L 2V engine 2,339 2,738
4.6L 4V MACH 1 engine 2,375 2,767 Klj . 4 ba
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A no-
drive condition can exist even with correct transmission fluid pressure because of inoperative
clutches or bands. An erratic shift can be located through a series of checks by substituting air
pressure for fluid pressure to determine the location of the malfunction.
Follow the procedure to determine the location of the inoperative clutch or band by introducing air
pressure into the various test plate passages.
NOTE: Use only dry, regulated 276 kPa (40 psi) maximum air pressure.
Apply air to the appropriate passage(s). A dull thud should be felt or heard or movement could be
observed when the clutch component applies. There should be no hissing sound when the component
is applied.
Cover the vent hole in the test plate with a clean, lint- free shop towel to prevent spray when the air is
applied. Plugging the vent hole during testing will result in inaccurate results.
1. Drain transmission fluid and remove the transmission fluid pan.
2. Remove the main control valve body.
3. Install transmission test plate and gasket. Tighten bolts to 10 Nm (89 lb- in).
4. NOTE: Do not apply air to the test plate vent hole.
Apply air to the appropriate clutch port (refer to the Transmission Air Test Plate illustration). A
dull thud may be heard or movement felt when the component is applied or released. If clutch
seals or check balls are leaking a hissing sound may be heard.
If the servos do not operate, disassemble, clean and inspect them to locate the source of the concern.
If air pressure applied to the clutch passages fails to operate a clutch, or operates clutches
simultaneously, inspect the fluid passages in the case.
If air pressure applied to the accumulator fails to operate an accumulator, remove and inspect case
passages and piston.
Clutch Pressure Test
The Clutch Pressure Test will diagnose a low- pressure condition or leakage in a clutch circuit. A
difference of 103 kPa (15 psi) or more between the clutch pressure and line pressure will prevent a
normal shift.
1. CAUTION: Pressure gauges affect the shift quality of the transmission. Care must
be taken not to accelerate or decelerate rapidly. Possible transmission failure can result.
Attach 0- 2068 kPa (0- 300 psi) pressure gauges to the line pressure tap and the appropriate
clutch pressure tap according to Band and Clutch Application Chart A&B. Gauges must be
accurate enough to distinguish a 103 kPa (15 psi) difference. (If this test is done in conjunction
with a control pressure test, pressure gauges will be attached to all pressure taps.) Have
sufficient flexible hose available to read the gauges in the vehicle.
2. Drive the vehicle. When pressure is applied to the clutch, note the difference between the line pressure gauge and the corresponding clutch pressure gauge.
3. If the difference in pressures is less than 103 kPa (15 psi), the corresponding clutch circuit does not have a pressure loss. The gauges on the line pressure tap and appropriate clutch pressure
tap can be switched to confirm that gauge calibration differences are not the cause. Klj . 6 ba
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DIAGNOSIS AND TESTING
Leakage Inspection
CAUTION: Do not try to stop the fluid leak by increasing the torque beyond specifications.
This may cause damage to the case threads.
Check the fluid filler tube connection at the transmission case. If leakage is found here, install a new
grommet.
Check the VSS plug or VSS sensor O-ring (model dependent). If leakage is found install a new O- ring.
Check fluid lines and fittings between the transmission and the cooler in the radiator tank for
looseness, wear, or damage. If leakage cannot be stopped by tightening a fluid tube nut, install new
parts. When fluid is found leaking between the case and cooler line fitting, check for missing or
damaged O- ring, then tighten the fitting to maximum specification.
If the leak continues, install a new cooler line fitting and tighten to specification. The same procedure
should be followed for fluid leaks between the radiator cooler and the cooler line fittings in this section;
refer to Section 307 - 02 .
Check the engine coolant in the radiator. If transmission fluid is present in the coolant, the cooler in the
radiator is probably leaking.
The cooler can be further checked for leaks by disconnecting the lines for the cooler fittings and
applying no more than 345 kPa (50 psi) air pressure to the fittings. Remove the radiator cap to relieve
the pressure buildup at the exterior of the oil cooler tank. If the cooler is leaking and or will not hold
pressure, install a new cooler.
If leakage is found at the transmission range selector lever, install a new seal.
If leakage is found at the transmission internal harness connector, install a new O- ring. 4R70W External Sealing SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Klj . 1 ba
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