2003 FORD MUSTANG clutch

just long enough to let the engine get to wide open throttle (WOT). While making this test, do
not hold the throttle open for more than 5 seconds at a time.
4. Note the results in each range.
5. After each range, move the shift control selector lever to NEUTRAL and run the engine at 1,000 rpm for about 15 seconds to cool the torque converter before making the next test.
6. Refer to the stall speed diagnosis chart for corrective actions.
Air Pressure Tests
Transmission Air Test Plate Stall Speed Diagnosis Chart Selector
Position
Stall Speeds High Stall Speeds Low
(D) Planetary One-
Way Clutch (D), 2 and 1 Forward Clutch or Intermediate
Clutch
(D), 2, 1 and
R Carry Out Pressure Test Torque Converter Stator One-
Way Clutch or
Engine Driveability Concerns R Reverse Clutch or Low Reverse
Band or Servo
Item Part Number Description
1 — Converter bypass
2 — Direct clutch
3 — Forward clutch
4 — 2-
3 accumulator, top 5 — 2-
3 accumulator, bottom 6 — Reverse servo
7 — Overdrive servo, apply
8 — Overdrive servo, release
9 — Intermediate clutch
10 — Reverse clutch
11 — 1-
2 accumulator, apply Klj . 5 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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4. If the difference is greater than 103 kPa (15 psi), there is a leak in the corresponding clutch
pressure circuit. The gauges on the line pressure tap and clutch pressure tap can be switched
to confirm that gauge calibration differences are not the cause. Carry out the appropriate
procedure to correct the clutch leak problem. Klj . 7 ba
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DIAGNOSIS AND TESTING
Transmission Fluid Cooler
CAUTION: Whenever a transmission has been disassembled to install new parts, the
cooler bypass valve (CBV), all transmission fluid coolers (in tank and auxiliary) and
transmission fluid cooler lines must be cleaned and backflushed. Use a suitable the torque
converter/fluid cooler cleaner.
NOTE: Cleaning and backflushing the transmission fluid cooling system along with following all the
normal cleaning and inspection procedures in this section during disassembly and reassembly will
keep contamination from reentering the transmission and causing a repeat repair.
When internal wear or damage has occurred in the transmission, metal particles, clutch plate material,
or band material may have been carried into the torque converter and transmission fluid cooler. These
contaminants are a major cause of recurring transmission troubles and must be removed from the
system before the transmission is put back into use.
Transmission Fluid Cooler Flow Test
NOTE: The transmission linkage/cable adjustment, fluid level and line pressure must be within
specification before carrying out this test. Refer to Section 307 - 05 for adjustments.
1. Remove fluid level indicator from fluid filler tube.
2. Place funnel in fluid filler tube.
3. Position the vehicle on a hoist. For additional information, refer to Section 100 - 02 .
4. Remove the cooler return line (top fitting) from the fitting on the transmission case.
5. Connect one end of a hose to the cooler return line and route other end of the hose up to a point where it can be inserted into the funnel at the fluid filler tube.
6. Remove the safety stands and lower the vehicle. Insert end of hose into the funnel.
7. Start the engine and run it at idle with the transmission in NEUTRAL.
8. When fluid flows from the hose in a steady stream, a liberal amount of fluid should be observed. "Liberal" is about 1 liter (1 quart) delivered in 15 seconds. If a liberal flow is observed, the test is
complete.
9. If the flow is not liberal, stop the engine. Disconnect the hose from the cooler return line and connect it to the converter outlet fitting (bottom fitting) on the transmission case.
10. Repeat steps 6 and 7. If flow is now approximately 1 liter (1 quart) in 15 seconds, refer to Transmission Fluid Cooler — Backflushing and Cleaning in this section. If the flow is still not
approximately 1 liter (1 quart) in 15 seconds, repair or install pump and or converter.
For the installation of new transmission fluid cooler or tubes, refer to Section 307 - 02 .
SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Klj . 1 ba
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Condition.
Shift Linkage
·
Damaged or incorrectly
adjusted ·
Inspect and repair as required. Verify transmission shift cable
adjustment; refer to Section 307 - 05 . Adjust transmission shift cable
as necessary. After repairing transmission shift cable, verify the digital
transmission range (TR) sensor is correctly adjusted. Adjust the
digital TR sensor as necessary. Incorrect Pressures
·
Low forward clutch
pressure, low line
pressure ·
Check pressure at line and forward clutch tap. Refer to Line Pressure
Chart for specification. If pressures are low, check the following
components: oil filter and seal assembly, main controls, pump
assembly, forward clutch assembly. Fluid Filter and Seal
Assembly
·
Plugged, damaged ·
Install a new filter and seal assembly. ·
Filter seal damaged Main Controls
·
3- 4 shift valve, main
regulator valve, manual
valve — stuck,
damaged ·
Inspect for damage. Repair as required. ·
Bolts not tightened to
specifications ·
Tighten bolts to specifications. ·
Gaskets damaged ·
Inspect gaskets for damage and install a new gasket. ·
2- 3 accumulator and
seals damaged ·
Inspect piston, seals and bore for damage. Repair as required. ·
Pressure regulator
valve ·
Inspect the diameter for wear. Pump Assembly
·
Bolts not tightened to
specifications ·
Tighten bolts to specifications. ·
Porosity/cross
leaks/ball missing or
leaking, plugged hole ·
Inspect for porosity and leaks. Repair as required. ·
No. 3 and No. 4 seal
rings damaged ·
Inspect seals for damage. Repair as required. ·
Gaskets damaged ·
Inspect for damage and install a new gasket. Forward Clutch
Assembly
·
Seals, piston damaged ·
Inspect seals for damage. Repair as required. ·
Check balls damaged,
missing, mislocated,
not seating correctly ·
Inspect for mislocation, poor seating, damage. Install a new cylinder
as required. ·
Friction elements
damaged or worn ·
Check for abnormal wear, damage. Repair as required. One-
Way Clutch
Assembly (Planetary) ·
Worn, damaged or
assembled incorrectly ·
Inspect for damage. Repair as required. Output Shaft Klj . 4 ba
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·
Damaged ·
Inspect for damage. Install new components as required.
Engagement Concern: No Reverse Possible Component Reference/Action
202 —
ELECTRICAL ROUTINE ·
No Electrical Concerns 302 —
HYDRAULIC/MECHANICAL ROUTINE Fluid
·
Incorrect level ·
Adjust fluid to correct level. ·
Condition ·
Inspect condition of fluid. Shift Linkage
·
Damaged or incorrectly
adjusted ·
Inspect and repair as required. Verify transmission shift cable
adjustment; refer to Section 307 - 05 . Adjust transmission shift
cable as necessary. After repairing transmission shift cable, verify
that the digital TR sensor is correctly adjusted. Adjust the digital
TR sensor as necessary. Incorrect Pressures
·
Low reverse clutch
pressure, low reverse band
pressure, low line pressure ·
Check pressure at line pressure tap; refer to Line Pressure Chart
for specifications. If pressures are low, check the following
components: oil filter and seal assembly, main controls, reverse
servo, pump assembly, reverse clutch assembly. Fluid Filter and Seal
Assembly
·
Plugged, damaged ·
Install a new filter and seal assembly. Main Controls
·
No. 6 shuttle ball, manual
valve, main regulator valve,
1- 2 accumulator seals
stuck or damaged ·
Inspect for damage. Repair as required. ·
Loose bolts ·
Tighten bolts to specifications. ·
Gasket damaged ·
Inspect for damage and install a new gasket. Low/Reverse Servo
·
Seals (piston and cover)
damaged ·
Inspect for damage. Repair as required. ·
Servo cover retaining ring
damaged ·
Anchor pins (case)
damaged Pump Assembly
·
Loose bolts ·
Tighten bolts to specifications. ·
Porosity/cross leaks/ball
missing or leaking, plugged
hole ·
Inspect pump assembly. Install new as required. ·
Gasket damaged ·
Inspect for damage and install a new gasket. ·
No. 1 and 2 seal rings
damaged ·
Inspect for damage. Repair as required. Reverse Clutch Assembly Klj . 5 ba
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·
Gasket damaged ·
Inspect for damage and install a new gasket. ·
EPC solenoid stuck or
damaged ·
Inspect for damage, contamination. Carry out EPC test in Routine
No. 203. Repair as required. Low Reverse Servo
·
Seals (piston and cover)
damaged ·
Inspect for damage. Repair as required. ·
Servo cover retaining ring
assembled incorrectly ·
Anchor pins (case)
damaged Pump Assembly
·
Bolts not tightened to
specifications ·
Tighten bolts to specifications. ·
Porosity/cross leaks ·
Inspect pump assembly. Install new as required. ·
Gasket damaged ·
Inspect for damage and install a new gasket. ·
No. 1 and No. 2 seal rings
damaged ·
Inspect for damage. Repair as required. Reverse Clutch Assembly
·
Seals, piston damaged ·
Inspect for damage. Repair as required. ·
Check ball missing or
damaged ·
Friction elements
damaged, worn ·
Return spring piston
damaged, worn Low Reverse Band
·
Band, servo, anchor pin
damaged or worn ·
Inspect for damage. Repair as required.
Engagement Concern: Harsh Forward Possible Component Reference/Action
204 —
ELECTRICAL ROUTINE Powertrain Control
System
·
Electrical inputs/outputs,
vehicle wiring
harnesses, PCM, TFT
sensor, EPC solenoid ·
Carry out Self- Test; refer to the Powertrain Control/Emissions
Diagnosis (PC/ED) manual for diagnosis and testing of the
Powertrain Control System. Carry out engagement test and EPC
test. Go To Pinpoint Test B or
Go To Pinpoint Test D . Check idle
speed. Repair as required. Clear DTCs, road test and repeat Self-
Test. 304 —
HYDRAULIC/MECHANICAL ROUTINE Fluid
·
Incorrect level ·
Adjust fluid to correct level. ·
Condition ·
Inspect condition of fluid. Engine Driveline
·
Looseness in the
driveshaft, U- joints or ·
Repair as required. Klj . 7 ba
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the engine mounts
Incorrect Pressures
·
High forward clutch
pressure, high line
pressure, high EPC
pressure ·
Check pressure at line, EPC and forward pressure taps. Refer to
Line Pressure Chart for specifications. If pressures are high, check
the following possible components: main controls, pump assembly. Main Controls
·
Main regulator valve
stuck, damaged ·
Inspect and repair as required. ·
Bolts not tightened to
specifications ·
Tighten bolts to specifications. ·
Gaskets damaged ·
Inspect for damage and install a new gasket. ·
EPC solenoid stuck or
damaged ·
Inspect for damage or contamination. Carry out EPC test in Routine
204. Repair as required. Case
·
2- 3 accumulator
seal/retainer stuck,
damaged ·
Inspect for damage. Repair as required. Pump Assembly
·
Bolts not tightened to
specifications ·
Tighten bolts to specifications. ·
Porosity/cross leaks ·
Inspect for porosity/leaks. Install a new pump as required. ·
Gaskets damaged ·
Inspect for damage and install a new gasket. Forward Clutch Assembly
·
Check balls missing or
damaged ·
Inspect for mislocation, poor seating, damage. Install a new forward
clutch cylinder. ·
Friction element
damaged or worn ·
Inspect for damage. Repair as required. ·
Forward clutch wave
spring damaged ·
Inspect for damage. Repair as required. ·
Forward clutch return
spring damaged ·
Inspect for damage. Repair as required.
Engagement Concern: Delayed/Soft Reverse Possible Component Reference/Action
205 —
ELECTRICAL
ROUTINE ·
No Electrical Concerns 305 —
HYDRAULIC/MECHANICAL ROUTINE Fluid
·
Incorrect level ·
Adjust fluid to correct level. ·
Condition ·
Inspect condition of fluid. Shift Linkage
·
Damaged or incorrectly
adjusted ·
Inspect and repair as required. Verify transmission shift cable
adjustment; refer to Section 307 - 05 . Adjust transmission shift cable
as necessary. After repairing transmission shift cable, verify that the
digital TR sensor is correctly adjusted. Adjust the digital TR sensor Klj . 8 ba
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